Third-stage turbine bucket airfoil

Information

  • Patent Grant
  • 6474948
  • Patent Number
    6,474,948
  • Date Filed
    Friday, June 22, 2001
    23 years ago
  • Date Issued
    Tuesday, November 5, 2002
    21 years ago
Abstract
The third-stage buckets have airfoil profiles substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at the radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z. The X, Y and Z values may be scaled as a function of the same constant or number to provide a scaled-up or scaled-down airfoil section for the bucket.
Description




BACKGROUND OF THE INVENTION




The present invention relates to a turbine bucket for a gas turbine stage and particularly relates to a third-stage turbine bucket airfoil profile.




In recent years, advanced gas turbines have trended toward increasing firing temperatures and efforts to improve cooling of the various turbine components. In a particular gas turbine design of the assignee, a high output turbine that uses a combination of steam and air cooling to meet a 60% combined cycle efficiency is undergoing development. It will be appreciated that the design and construction of the turbine buckets and particularly the buckets of the third turbine stage of that turbine require optimized aerodynamic efficiency, as well as aerodynamic and mechanical bucket loading.




BRIEF SUMMARY OF THE INVENTION




In accordance with an embodiment of the present invention, there is provided a unique turbine bucket airfoil profile for a turbine stage, preferably the third stage, which may be defined by a unique loci of points to achieve the necessary efficiency in loading requirements whereby improved turbine performance is obtained. It will be appreciated that the nominal profile given by the X, Y, Z coordinates of Table I, which follows, define this unique loci of points. The coordinates given in inches in Table I are for a cold, i.e., room-temperature profile for each cross-section of the bucket. Each defined cross-section is joined smoothly with adjacent cross-sections to form the complete airfoil shape. It will also be appreciated that as the bucket heats up in use, the profile will change as a result of stress and temperature. Thus, the cold or room-temperature profile is given by the X, Y, Z coordinates for manufacturing purposes. Because a manufactured bucket airfoil profile may be different than the nominal airfoil profile given in the following table, a distance of ±0.160 inches from the nominal profile in a direction normal to any surface location along the nominal profile and which includes any coating process, defines the profile envelope for this design. The design is robust to this variation with impairment of the mechanical and aerodynamic functions.




It will also be appreciated that the airfoil can be scaled-up or scaled-down geometrically for introduction into other similar turbine designs. Consequently, the X, Y and Z coordinates of the nominal airfoil profile given below are a function of the same constant or number. That is, the X, Y and Z coordinate values given in the Table may be multiplied or divided by the same constant or number to provide a scaled-up or scaled-down version of the bucket airfoil profile, while retaining the airfoil section shape.




In a preferred embodiment according to the present invention, there is provided a turbine bucket having a bucket airfoil shape in an envelope within ±0.160 inches in a direction normal to any airfoil surface location wherein the airfoil has an uncoated nominal profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape.




In a further preferred embodiment according to the present invention, there is provided a turbine bucket having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil bucket profile, the X, Y and Z values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.




In a further preferred embodiment according to the present invention, there is provided a turbine comprising a turbine wheel having a plurality of buckets, each of the buckets having an airfoil shape in an envelope within ±0.160 inches in a direction normal to any bucket airfoil surface location wherein the airfoil has an uncoated nominal profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape.




In a further preferred embodiment according to the present invention, there is provided a turbine comprising a turbine wheel having a plurality of buckets, each of the buckets having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape, the X and Y values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a side elevational view of a turbine bucket including an airfoil, shank and dovetail constructed in accordance with a preferred embodiment of the present invention;





FIG. 2

is a top, leading edge and pressure side perspective view thereof;





FIG. 3

is a perspective view of the bucket as viewed along its leading edge;





FIG. 4

is a perspective view of the bucket as viewed along its trailing edge;





FIG. 5

is a top, leading edge and suction side view of the bucket hereof;





FIG. 6

is an enlarged end view of the bucket as viewed radially inwardly; and





FIG. 7

is a schematic illustration of a turbine having a third-stage turbine wheel employing the buckets hereof.











DETAILED DESCRIPTION OF THE INVENTION




Referring now to the drawing figures, particularly to

FIGS. 1 and 2

, there is illustrated a turbine blade constructed in accordance with the present invention and including an airfoil


10


mounted on a platform


12


carried by a shank


14


. The radially inner end of the shank


14


carries a dovetail


16


for coupling the blade to a turbine wheel, not shown. The airfoil


10


, platform


12


and dovetail


16


are collectively referred to as a bucket, generally designated


17


. The airfoil


10


has a compound curvature with suction and pressure sides


18


and


20


, respectively. As conventional, it will be appreciated that the dovetail


16


mates in dovetail openings in a turbine wheel. A plurality of the present third-stage buckets, preferably ninety-two buckets, are circumferentially spaced one from the other about the wheel and turbine rotor axis. Additionally, there are wheelspace seals


22


, i.e., angel wings, formed on the axially forward and aft sides of shank


14


. Preferably, the bucket is integrally cast with cooling, preferably air-cooling, passages, not shown, internal to the bucket including airfoil


10


.




Referring now to the drawing figures, there is shown a Cartesian coordinate system for X, Y and Z values. These coordinate values are set forth in inches in Table I which follows. The Cartesian coordinate system has orthogonally-related X, Y and Z axes with the Z axis extending perpendicular to a plane normal to a radius from the centerline of the turbine rotor, i.e., normal to a plane containing the X and Y values. The Z distance commences at zero in the X, Y plane at the radially innermost aerodynamic section. The Y axis lies parallel to the turbine rotor centerline, i.e., the rotary axis. By defining X and Y coordinate values at selected locations in a Z direction normal to the X, Y plane, the profile of airfoil


10


can be ascertained. By connecting the X and Y values with smooth, continuing arcs, each profile section at each distance Z is fixed. The surface profiles at the various surface locations between the distances Z are connected smoothly to one another to form the airfoil. The tabular values given in Table I below are in inches and represent airfoil profiles at ambient, non-operating or non-hot conditions and are for an uncoated airfoil. The sign convention assigns a positive value to the value Z and positive and negative values for the X and Y coordinates, as typically used in a Cartesian coordinate system.




The Table I values are generated and shown to three decimal places for determining the profiles of the airfoil. Further, there are typical manufacturing tolerances as well as coatings which must be accounted for in the actual profile of the airfoil. Accordingly, the values for the profile given in Table I are for a nominal airfoil. It will therefore be appreciated that ± typical manufacturing tolerances, i.e., plus or minus values and coating thicknesses, are additive to the X and Y values given in Table I below. Accordingly, a distance of ±0.160 inches in a direction normal to any surface location along the airfoil profile defines an airfoil profile envelope for this particular bucket design and turbine.




The coordinate values given in Table I below provide the preferred nominal profile envelope.














TABLE I









X




Y




Z

























0.215




−1.756




0.000






−0.188




−1.723




0.000






−0.533




−1.498




0.000






−0.804




−1.187




0.000






−0.110




−1.751




0.000






−0.471




−1.553




0.000






−0.758




−1.255




0.000






−0.029




−1.771




0.000






−0.405




−1.603




0.000






−0.706




−1.320




0.000






−0.926




−0.970




0.000






0.342




−1.655




0.000






0.288




−1.718




0.000






0.053




−1.781




0.000






−0.335




−1.648




0.000






−0.651




−1.382




0.000






−0.886




−1.043




0.000






0.136




−1.779




0.000






−0.263




−1.688




0.000






−0.593




−1.441




0.000






−0.846




−1.115




0.000






−0.993




−0.819




0.000






0.392




−1.414




0.000






−1.062




−0.412




0.000






−0.963




−0.896




0.000






0.393




−1.331




0.000






−1.060




−0.495




0.000






0.391




−1.248




0.000






−1.053




−0.578




0.000






0.386




−1.166




0.000






−1.038




−0.659




0.000






0.371




−1.578




0.000






−1.018




−0.740




0.000






0.386




−1.497




0.000






0.368




−0.174




0.000






0.346




−0.587




0.000






0.372




−1.001




0.000






−1.002




−0.005




0.000






0.382




−0.092




0.000






0.346




−0.504




0.000






0.364




−0.918




0.000






−1.026




−0.084




0.000






−0.811




0.361




0.000






0.348




−0.422




0.000






0.357




−0.836




0.000






−1.043




−0.165




0.000






0.352




−0.339




0.000






0.352




−0.753




0.000






−0.858




0.293




0.000






−1.054




−0.247




0.000






−0.938




0.149




0.000






−0.759




0.426




0.000






0.359




−0.256




0.000






0.348




−0.670




0.000






−0.704




0.488




0.000






0.380




−1.083




0.000






−1.059




−0.330




0.000






−0.972




0.073




0.000






−0.901




0.222




0.000






0.380




1.236




0.000






0.469




0.227




0.000






−0.271




0.872




0.000






0.158




1.123




0.000






0.085




1.084




0.000






0.696




0.669




0.000






−0.402




0.771




0.000






0.499




0.304




0.000






−0.588




0.606




0.000






−0.337




0.823




0.000






0.012




1.044




0.000






0.742




0.737




0.000






−0.060




1.004




0.000






0.533




0.380




0.000






−0.202




0.919




0.000






0.398




−0.011




0.000






−0.647




0.548




0.000






0.792




0.803




0.000






0.232




1.161




0.000






0.570




0.454




0.000






0.418




0.069




0.000






−0.132




0.963




0.000






0.843




0.869




0.000






0.609




0.527




0.000






−0.465




0.718




0.000






0.442




0.149




0.000






−0.527




0.662




0.000






0.306




1.199




0.000






0.895




0.933




0.000






0.651




0.598




0.000






0.529




1.307




0.000






1.443




1.699




0.000






1.557




1.557




0.000






1.237




1.293




0.000






1.214




1.603




0.000






0.948




0.996




0.000






1.290




1.635




0.000






1.137




1.571




0.000






0.908




1.475




0.000






1.621




1.609




0.000






1.299




1.349




0.000






1.003




1.058




0.000






0.680




1.376




0.000






1.366




1.667




0.000






0.756




1.409




0.000






1.683




1.664




0.000






1.362




1.402




0.000






1.678




1.776




0.000






1.060




1.119




0.000






1.597




1.760




0.000






1.519




1.731




0.000






0.984




1.507




0.000






0.605




1.342




0.000






1.426




1.454




0.000






1.117




1.179




0.000






1.061




1.539




0.000






0.832




1.442




0.000






1.733




1.727




0.000






1.491




1.506




0.000






1.176




1.237




0.000






0.454




1.272




0.000






−0.172




−1.723




0.500






−0.529




−1.519




0.500






−0.810




−1.217




0.500






−0.092




−1.744




0.500






−0.464




−1.570




0.500






−0.760




−1.283




0.500






−0.969




−0.927




0.500






0.010




−1.755




0.500






−0.395




−1.617




0.500






−0.706




−1.346




0.500






−0.932




−1.001




0.500






0.073




−1.753




0.500






−0.324




−1.658




0.500






0.278




−1.630




0.500






−0.649




−1.406




0.500






−0.894




−1.075




0.500






0.225




−1.693




0.500






0.152




−1.731




0.500






−0.249




−1.694




0.500






−0.590




−1.464




0.500






−0.854




−1.147




0.500






0.325




−1.473




0.500






−1.002




−0.851




0.500






−1.074




−0.447




0.500






0.331




−1.390




0.500






−1.072




−0.529




0.500






0.333




−1.308




0.500






−1.063




−0.612




0.500






0.332




−1.225




0.500






−1.048




−0.693




0.500






0.328




−1.142




0.500






0.309




−1.554




0.500






−1.028




−0.773




0.500






−1.070




−0.364




0.500






−0.979




0.037




0.500






−0.764




0.389




0.500






0.331




−0.235




0.500






0.302




−0.647




0.500






0.323




−1.060




0.500






−1.009




−0.040




0.500






−0.816




0.324




0.500






0.346




−0.154




0.500






0.303




−0.564




0.500






0.317




−0.977




0.500






−1.033




−0.119




0.500






−0.863




0.256




0.500






0.363




−0.073




0.500






0.306




−0.482




0.500






0.312




−0.895




0.500






−1.050




−0.200




0.500






−0.906




0.185




0.500






−0.652




0.510




0.500






0.312




−0.399




0.500






0.307




−0.812




0.500






−1.062




−0.282




0.500






−0.944




0.112




0.500






−0.709




0.450




0.500






0.320




−0.317




0.500






0.304




−0.730




0.500






0.866




0.866




0.500






0.621




0.533




0.500






−0.469




0.677




0.500






0.436




0.164




0.500






−0.135




0.921




0.500






0.228




1.119




0.500






0.920




0.929




0.500






0.666




0.603




0.500






−0.531




0.623




0.500






0.467




0.241




0.500






−0.205




0.877




0.500






0.154




1.080




0.500






0.713




0.671




0.500






−0.592




0.567




0.500






0.501




0.316




0.500






−0.273




0.830




0.500






0.081




1.042




0.500






0.762




0.738




0.500






0.539




0.390




0.500






−0.340




0.781




0.500






0.384




0.007




0.500






0.009




1.002




0.500






0.375




1.193




0.500






0.813




0.802




0.500






0.579




0.462




0.500






−0.405




0.730




0.500






0.409




0.086




0.500






−0.064




0.962




0.500






0.301




1.156




0.500






0.599




1.300




0.500






0.978




1.465




0.500






1.359




1.625




0.500






1.747




1.762




0.500






1.527




1.487




0.500






1.208




1.225




0.500






0.524




1.265




0.500






0.902




1.433




0.500






1.283




1.594




0.500






1.666




1.749




0.500






1.593




1.538




0.500






1.270




1.280




0.500






0.975




0.991




0.500






0.450




1.229




0.500






0.826




1.400




0.500






1.207




1.562




0.500






1.588




1.721




0.500






1.658




1.589




0.500






1.333




1.334




0.500






1.031




1.051




0.500






0.750




1.367




0.500






1.131




1.530




0.500






1.512




1.689




0.500






1.721




1.642




0.500






1.397




1.386




0.500






1.089




1.110




0.500






0.675




1.334




0.500






1.054




1.497




0.500






1.436




1.657




0.500






1.781




1.699




0.500






1.462




1.437




0.500






1.143




1.168




0.500






−0.943




−1.035




1.000






−0.706




−1.371




1.000






0.215




−1.605




1.000






−0.385




−1.628




1.000






0.009




−1.728




1.000






−0.978




−0.961




1.000






−0.762




−1.310




1.000






−0.456




−1.585




1.000






−0.073




−1.729




1.000






−1.010




−0.885




1.000






−0.814




−1.246




1.000






−0.524




−1.538




1.000






−0.155




−1.717




1.000






−0.862




−1.179




1.000






−0.588




−1.487




1.000






−0.234




−1.695




1.000






−0.905




−1.109




1.000






−0.649




−1.430




1.000






−0.311




−1.665




1.000






0.089




−1.707




1.000






0.161




−1.667




1.000






−1.075




−0.646




1.000






0.272




−1.202




1.000






−1.085




−0.564




1.000






0.273




−1.284




1.000






−1.088




−0.482




1.000






0.271




−1.367




1.000






−1.085




−0.400




1.000






−1.038




−0.807




1.000






0.264




−1.449




1.000






−1.060




−0.727




1.000






0.248




−1.530




1.000






0.268




−1.119




1.000






−0.659




0.470




1.000






−0.912




0.147




1.000






−1.061




−0.236




1.000






0.255




−0.790




1.000






0.274




−0.378




1.000






−0.599




0.527




1.000






−0.869




0.217




1.000






−1.042




−0.156




1.000






0.256




−0.872




1.000






0.264




−0.460




1.000






0.345




−0.056




1.000






−0.822




0.285




1.000






−1.018




−0.077




1.000






0.259




−0.955




1.000






0.258




−0.542




1.000






0.322




−0.135




1.000






−0.771




0.349




1.000






−0.988




0.000




1.000






0.263




−1.037




1.000






0.255




−0.624




1.000






0.303




−0.215




1.000






−0.716




0.411




1.000






−0.952




0.074




1.000






−1.075




−0.318




1.000






0.254




−0.707




1.000






0.287




−0.296




1.000






0.400




0.100




1.000






−0.344




0.738




1.000






0.588




0.467




1.000






0.834




0.798




1.000






0.443




1.187




1.000






0.076




0.999




1.000






0.371




0.023




1.000






−0.278




0.786




1.000






0.545




0.396




1.000






0.781




0.734




1.000






0.148




1.038




1.000






−0.209




0.833




1.000






0.504




0.324




1.000






−0.537




0.582




1.000






0.730




0.669




1.000






0.222




1.076




1.000






−0.140




0.877




1.000






0.467




0.251




1.000






−0.474




0.636




1.000






0.681




0.603




1.000






0.944




0.921




1.000






0.295




1.114




1.000






−0.069




0.920




1.000






0.432




0.176




1.000






−0.410




0.687




1.000






0.634




0.536




1.000






0.889




0.860




1.000






0.369




1.151




1.000






0.003




0.960




1.000






1.117




1.098




1.000






1.430




1.367




1.000






1.758




1.616




1.000






1.579




1.679




1.000






1.198




1.519




1.000






0.819




1.358




1.000






1.058




1.040




1.000






1.365




1.316




1.000






1.694




1.565




1.000






1.655




1.711




1.000






1.275




1.551




1.000






0.894




1.391




1.000






0.518




1.222




1.000






1.001




0.981




1.000






1.301




1.263




1.000






1.628




1.516




1.000






1.733




1.739




1.000






1.351




1.583




1.000






0.970




1.423




1.000






0.593




1.257




1.000






1.239




1.209




1.000






1.562




1.466




1.000






1.813




1.742




1.000






1.427




1.615




1.000






1.046




1.455




1.000






0.668




1.291




1.000






1.178




1.154




1.000






1.495




1.417




1.000






1.821




1.670




1.000






1.503




1.647




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13.500






−0.605




−0.474




13.500






−1.294




−0.259




13.500






−1.555




−0.545




13.500






−1.234




−1.052




13.500






−1.659




−0.914




13.500






−0.970




−0.766




13.500






−0.670




−0.518




13.500






−1.232




−0.212




13.500






−1.512




−0.481




13.500






−1.290




−1.107




13.500






−1.658




−0.837




13.500






−1.025




−0.821




13.500






−0.733




−0.564




13.500






−1.168




−0.167




13.500






−1.463




−0.420




13.500






−1.353




−1.152




13.500






−1.646




−0.760




13.500






−1.079




−0.878




13.500






−1.570




−1.125




13.500






−0.795




−0.611




13.500






−1.504




−1.165




13.500






−1.410




−0.363




13.500






−1.427




−1.175




13.500






−1.624




−0.685




13.500






−0.540




−0.432




13.500






−0.204




−0.235




13.500






0.143




−0.057




13.500






0.495




0.110




13.500






0.037




0.376




13.500






−0.329




0.242




13.500






−0.689




0.093




13.500






−1.036




−0.084




13.500






−0.272




−0.272




13.500






0.073




−0.092




13.500






0.424




0.077




13.500






0.110




0.402




13.500






−0.256




0.270




13.500






−0.618




0.125




13.500






−0.968




−0.046




13.500






−0.340




−0.311




13.500






0.003




−0.126




13.500






0.354




0.044




13.500






−0.183




0.297




13.500






−0.546




0.155




13.500






−0.900




−0.009




13.500






−0.407




−0.350




13.500






−0.066




−0.162




13.500






0.283




0.010




13.500






−0.110




0.324




13.500






−0.474




0.185




13.500






−0.830




0.026




13.500






−0.474




−0.390




13.500






−0.135




−0.198




13.500






0.213




−0.023




13.500






0.565




0.143




13.500






−0.037




0.350




13.500






−0.402




0.214




13.500






−0.760




0.060




13.500






−1.103




−0.124




13.500






1.151




0.729




13.500






0.777




0.619




13.500






0.406




0.501




13.500






0.848




0.274




13.500






1.204




0.434




13.500






1.559




0.593




13.500






1.226




0.750




13.500






0.852




0.641




13.500






0.480




0.525




13.500






0.778




0.241




13.500






1.133




0.402




13.500






1.488




0.561




13.500






1.301




0.771




13.500






0.927




0.664




13.500






0.554




0.549




13.500






0.184




0.427




13.500






0.707




0.209




13.500






1.062




0.370




13.500






1.417




0.529




13.500






1.376




0.792




13.500






1.001




0.686




13.500






0.628




0.573




13.500






0.258




0.452




13.500






0.636




0.176




13.500






0.990




0.338




13.500






1.346




0.498




13.500






1.076




0.707




13.500






0.703




0.596




13.500






0.332




0.477




13.500






1.275




0.466




13.500






1.630




0.625




13.500






0.919




0.306




13.500






1.902




0.936




13.500






1.526




0.834




13.500






1.914




0.755




13.500






2.264




0.924




13.500






1.978




0.956




13.500






1.601




0.854




13.500






1.843




0.722




13.500






2.197




0.886




13.500






2.053




0.976




13.500






1.677




0.875




13.500






1.772




0.690




13.500






2.126




0.852




13.500






2.128




0.996




13.500






1.752




0.895




13.500






1.701




0.658




13.500






2.056




0.820




13.500






2.204




1.016




13.500






1.827




0.916




13.500






1.451




0.813




13.500






1.985




0.787




13.500






2.273




0.995




13.500






−0.884




−0.666




14.000






−1.662




−1.109




14.000






−1.173




−0.930




14.000






−1.626




−0.641




14.000






−1.485




−1.150




14.000






−1.382




−0.339




14.000






−1.561




−1.133




14.000






−0.822




−0.618




14.000






−1.623




−1.086




14.000






−1.117




−0.875




14.000






−1.657




−0.713




14.000






−1.409




−1.133




14.000






−1.440




−0.391




14.000






−1.128




−0.156




14.000






−0.759




−0.572




14.000






−1.061




−0.820




14.000






−1.679




−0.788




14.000






−1.343




−1.092




14.000






−1.494




−0.448




14.000






−1.194




−0.198




14.000






−0.694




−0.527




14.000






−1.003




−0.767




14.000






−1.689




−0.866




14.000






−1.283




−1.040




14.000






−1.543




−0.509




14.000






−1.259




−0.242




14.000






−0.629




−0.484




14.000






−0.944




−0.715




14.000






−1.684




−0.944




14.000






−1.228




−0.985




14.000






−1.588




−0.573




14.000






−1.321




−0.289




14.000






−0.563




−0.442




14.000






−1.061




−0.116




14.000






−0.711




0.060




14.000






−0.349




0.209




14.000






0.019




0.342




14.000






0.556




0.120




14.000






0.200




−0.043




14.000






−0.153




−0.213




14.000






−0.496




−0.401




14.000






−0.782




0.027




14.000






−0.422




0.181




14.000






−0.055




0.316




14.000






0.627




0.152




14.000






0.271




−0.011




14.000






−0.083




−0.178




14.000






−0.429




−0.361




14.000






−0.853




−0.006




14.000






−0.495




0.152




14.000






−0.129




0.290




14.000






0.342




0.022




14.000






−0.013




−0.143




14.000






−0.360




−0.323




14.000






−0.923




−0.041




14.000






−0.567




0.122




14.000






−0.202




0.263




14.000






0.167




0.393




14.000






0.414




0.055




14.000






0.058




−0.109




14.000






−0.292




−0.285




14.000






−0.992




−0.078




14.000






−0.639




0.091




14.000






−0.276




0.236




14.000






0.093




0.368




14.000






0.485




0.087




14.000






0.129




−0.076




14.000






−0.223




−0.248




14.000






1.629




0.596




14.000






1.271




0.438




14.000






0.913




0.281




14.000






0.390




0.467




14.000






0.764




0.585




14.000






1.139




0.696




14.000






1.701




0.628




14.000






1.343




0.470




14.000






0.985




0.312




14.000






0.316




0.442




14.000






0.689




0.562




14.000






1.064




0.674




14.000






1.441




0.781




14.000






1.415




0.501




14.000






1.056




0.344




14.000






0.699




0.185




14.000






0.242




0.418




14.000






0.614




0.539




14.000






0.989




0.652




14.000






1.365




0.760




14.000






1.486




0.533




14.000






1.128




0.375




14.000






0.770




0.217




14.000






0.539




0.515




14.000






0.914




0.630




14.000






1.290




0.739




14.000






1.558




0.565




14.000






1.200




0.407




14.000






0.841




0.249




14.000






0.465




0.491




14.000






0.838




0.608




14.000






1.214




0.717




14.000






1.592




0.822




14.000






1.970




0.924




14.000






2.319




0.943




14.000






1.987




0.757




14.000






1.516




0.801




14.000






1.894




0.904




14.000






2.273




0.998




14.000






2.058




0.788




14.000






1.818




0.883




14.000






2.197




0.983




14.000






2.130




0.820




14.000






1.772




0.660




14.000






1.743




0.863




14.000






2.121




0.964




14.000






2.201




0.852




14.000






1.844




0.692




14.000






1.667




0.843




14.000






2.045




0.944




14.000






2.272




0.886




14.000






1.915




0.725




14.000






−1.449




−1.114




14.392






−1.601




−1.103




14.392






−1.380




−1.076




14.392






−1.693




−0.981




14.392






−1.201




−0.923




14.392






−1.660




−1.052




14.392






−1.574




−0.543




14.392






−1.704




−0.826




14.392






−1.526




−1.126




14.392






−1.686




−0.749




14.392






−1.259




−0.976




14.392






−1.707




−0.904




14.392






−1.318




−1.028




14.392






−1.657




−0.676




14.392






−1.619




−0.607




14.392






−0.901




−0.668




14.392






−1.024




−0.766




14.392






−1.351




−0.322




14.392






−0.963




−0.716




14.392






−1.524




−0.482




14.392






−1.470




−0.424




14.392






−1.288




−0.275




14.392






−1.412




−0.371




14.392






−1.142




−0.870




14.392






−0.837




−0.621




14.392






−1.084




−0.817




14.392






−1.223




−0.230




14.392






−0.575




−0.448




14.392






−0.950




−0.074




14.392






−0.708




−0.532




14.392






−0.642




−0.489




14.392






−0.507




−0.408




14.392






−1.089




−0.148




14.392






−0.879




−0.039




14.392






−0.808




−0.005




14.392






−1.020




−0.110




14.392






−0.773




−0.576




14.392






−0.439




−0.368




14.392






−0.737




0.027




14.392






−0.157




−0.188




14.392






−0.231




−0.256




14.392






−0.301




−0.293




14.392






0.052




−0.119




14.392






−0.373




0.177




14.392






−0.370




−0.330




14.392






−0.592




0.090




14.392






−0.019




−0.152




14.392






−0.090




−0.186




14.392






−0.446




0.149




14.392






−0.299




0.205




14.392






−0.665




0.059




14.392






−0.519




0.120




14.392






−0.161




−0.221




14.392






0.627




0.139




14.392






0.124




−0.086




14.392






0.483




0.075




14.392






0.411




0.043




14.392






−0.151




0.259




14.392






0.072




0.337




14.392






0.555




0.107




14.392






0.146




0.362




14.392






0.339




0.010




14.392






0.221




0.387




14.392






−0.003




0.311




14.392






0.371




0.436




14.392






−0.077




0.285




14.392






−0.225




0.232




14.392






0.268




−0.022




14.392






0.196




−0.054




14.392






0.296




0.412




14.392






0.915




0.266




14.392






0.843




0.234




14.392






1.204




0.390




14.392






0.896




0.601




14.392






0.771




0.202




14.392






1.132




0.359




14.392






0.670




0.532




14.392






0.972




0.623




14.392






0.746




0.555




14.392






0.445




0.461




14.392






0.699




0.171




14.392






1.060




0.328




14.392






0.821




0.578




14.392






0.987




0.297




14.392






0.595




0.509




14.392






0.520




0.485




14.392






1.783




0.639




14.392






1.277




0.421




14.392






1.638




0.577




14.392






1.123




0.667




14.392






1.274




0.711




14.392






1.566




0.545




14.392






1.654




0.815




14.392






1.199




0.689




14.392






1.350




0.732




14.392






1.494




0.514




14.392






1.426




0.753




14.392






1.421




0.483




14.392






1.502




0.774




14.392






1.047




0.646




14.392






1.349




0.452




14.392






1.710




0.608




14.392






1.578




0.795




14.392






2.351




0.904




14.392






2.034




0.917




14.392






2.287




0.861




14.392






2.110




0.937




14.392






1.730




0.836




14.392






1.855




0.671




14.392






2.215




0.828




14.392






2.186




0.957




14.392






1.927




0.703




14.392






1.806




0.856




14.392






1.999




0.734




14.392






2.143




0.797




14.392






2.262




0.977




14.392






1.882




0.877




14.392






2.071




0.766




14.392






2.338




0.974




14.392






1.958




0.897




14.392














It will also be appreciated that the airfoil disclosed in the above Table may be scaled up or down geometrically for use in other similar turbine designs. Consequently, the coordinate values set forth in Table I may be scaled upwardly or downwardly such that the airfoil section shape remains unchanged. A scaled version of the coordinates in Table I would be represented by X, Y and Z coordinate values multiplied or divided by the same constant or number.




Referring now to

FIG. 7

, there is illustrated a turbine in which the turbine bucket having the airfoil defined herein may be utilized. In the illustrated turbine, the turbine rotor, designated


40


, has first, second, third and fourth-stage rotor wheels


42


,


44


,


46


and


48


mounting buckets which, in conjunction with respective stator vanes


41


,


43


,


45


and


47


, form the various stages of the rotor. Particularly, the third stage comprises a third-stage rotor wheel


46


on which the airfoils


10


hereof are mounted in opposition to third-stage stator vanes


45


. It will be appreciated that a plurality of the airfoils


10


are spaced circumferentially one from the other about the third-stage wheel


46


and, in this instance, there are ninety-two buckets mounted on the third-stage wheel


46


.




While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.



Claims
  • 1. A turbine bucket having a bucket airfoil shape in an envelope within ±0.160 inches in a direction normal to any airfoil surface location wherein the airfoil has an uncoated nominal profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape.
  • 2. A turbine bucket according to claim 1 forming part of a third stage of a turbine.
  • 3. A turbine bucket having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil bucket profile;the X, Y and Z values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.
  • 4. A turbine bucket according to claim 3 forming part of a third stage of a turbine.
  • 5. A turbine comprising a turbine wheel having a plurality of buckets, each of said buckets having an airfoil shape in an envelope within ±0.160 inches in a direction normal to any bucket airfoil surface location wherein the airfoil has an uncoated nominal profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape.
  • 6. A turbine according to claim 5 wherein the turbine wheel comprises a third-stage turbine.
  • 7. A turbine according to claim 5 wherein the turbine wheel has ninety-two buckets and Y represents a distance parallel to a long axis of the turbine wheel.
  • 8. A turbine comprising a turbine wheel having a plurality of buckets, each of said buckets having an uncoated nominal airfoil profile substantially in accordance with Cartesian coordinates values of X, Y and Z set forth in inches in Table I wherein Z is a perpendicular distance from a plane normal to a radius of the turbine centerline and containing the X and Y values with the Z value commencing at zero in the X, Y plane at a radially innermost aerodynamic section of the airfoil and X and Y are coordinates defining the airfoil profile at each distance Z, the profiles at the Z distances being joined smoothly with one another to form the complete airfoil shape;the X and Y values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down bucket airfoil.
  • 9. A turbine according to claim 8 wherein the turbine wheel comprises a third stage of the turbine.
  • 10. A turbine according to claim 8 wherein the turbine wheel has ninety-two buckets and Y represents a distance parallel to a long axis of the turbine wheel.
Government Interests

This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.

US Referenced Citations (5)
Number Name Date Kind
4585395 Nourse et al. Apr 1986 A
5174715 Martin Dec 1992 A
5267834 Dinh et al. Dec 1993 A
5299915 Dinh et al. Apr 1994 A
5980209 Barry et al. Nov 1999 A
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