The subject matter disclosed herein relates to the art of turbomachines and, more particularly, to a turbomachine blade having a tip portion including a squeeler pocket.
In general, gas turbomachines include a combustor assembly within which a fuel/air mixture is combusted to release heat energy. The heat energy forms a high temperature gas stream that is channeled to a turbine portion via a hot gas path. The hot gas stream flows over rotor blades that convert thermal energy from the high temperature gas stream to mechanical energy that rotates a turbine shaft. The turbine portion may be used in a variety of applications, such as for providing power to a pump or an electrical generator.
The rotor blades typically include an airfoil, having a pressure side and a suction side joined by leading and trailing edges, which guide the hot gas stream along the hot gas path. The airfoil is generally joined to a base portion having a dovetail mount. The dovetail mount provides an interface to a turbine rotor which, in addition to supporting the rotor blades, provides a delivery pathway for cooling air. More specifically, cooling air is guided from the turbine rotor into cavities formed in the rotor blades. The cooling air flows through the cavities to lower temperatures at the pressure side, suction side and the leading and trailing edges. In addition, rotor blades are formed with tip cavities that receive a portion of the cooling air. The cooling air passing into the tip cavity lowers temperatures at tip portions of the rotor blades.
According to one aspect of the exemplary embodiment, a turbine blade includes an airfoil portion including a suction side having a suction side contour, a pressure side having a pressure side contour, a leading edge, a trailing edge and a tip portion, and a squeeler pocket formed in the tip portion. The squeeler pocket includes a base wall, a first side wall that extends along the pressure side between the leading edge and the trailing edge, and a second side wall that extends along the suction side between the leading edge and the trailing edge. The first side wall includes a first internal surface having a first substantially continuous curvilinear profile and the second side wall includes a second internal surface having a second substantially continuous curvilinear profile. A bleed passage extends from the squeeler pocket towards the trailing edge. The first and second side walls are configured to deliver a substantially unobstructed fluid flow from the squeeler pocket to the bleed passage and limit the fluid flow spillage onto one of the pressure side and the suction side.
According to another aspect of the exemplary embodiment, a turbomachine includes a compressor portion, a combustor assembly fluidly coupled to the compressor portion, and a turbine portion operatively coupled to the compressor portion and fluidly connected to the combustor assembly. The turbine portion includes a turbine blade provided with an airfoil portion including a suction side having a suction side contour, a pressure side having a pressure side contour, a leading edge, a trailing edge and a tip portion. A squeeler pocket is formed in the tip portion. The squeeler pocket includes a base wall, a first side wall that extends along the pressure side between the leading edge and the trailing edge, and a second side wall that extends along the suction side between the leading edge and the trailing edge. The first side wall includes a first internal surface having a first substantially continuous curvilinear profile, and the second side wall includes a second internal surface having a second substantially continuous curvilinear profile. A bleed passage extends from the squeeler pocket towards the trailing edge. The first and second side walls are configured to deliver a substantially unobstructed fluid flow from the squeeler pocket to the bleed passage and limit the fluid flow spillage onto one of the pressure side and the suction side.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
With reference to
Reference will now be made to
In accordance with an exemplary embodiment, squeeler pocket 60 includes a base wall 64 that is bounded by first and second side walls 66 and 67. First sidewall 66 includes a first inner surface 69 having a substantially continuous curvilinear profile. Similarly, second sidewall 67 includes a second inner surface 72 having a substantially continuous curvilinear profile. More specifically, first inner surface includes a substantially continuous curvilinear profile that substantially mirrors the pressure side contour. Second inner surface 72 includes a substantially continuous curvilinear profile that substantially mirrors the suction side contour. At this point it should be understood that the phrase “substantially continuous curvilinear profile” should be understood to describe a curvilinear wall having substantially no excursions (bumps and the like) between leading edge 47 along a path toward trailing edge 48.
In further accordance with the exemplary embodiment, tip portion 50 includes a bleed passage 84 that extends from squeeler pocket 60 to trailing edge 48. Bleed passage 84 is exposed at tip portion 50 and includes a first end portion 85 that extends from squeeler pocket 60 to a second end portion 86. In the exemplary aspect shown, second end portion 86 is provided with an outlet 87 shown in the form of an opening (not separately labeled) formed in trailing edge 48 at tip portion 50. Outlet 87 provides a pathway for working fluid entering squeeler pocket 60 to exit tip portion 50 without spilling over onto a working surface. Moreover, by providing a substantially continuous curvilinear profile for first and second side walls 66 and 67, turbulence in the working fluid entering squeeler pocket 60 is reduced thereby substantially reducing or eliminating spillage or over flow onto pressure side 45 or suction side 44. The reduction or elimination of overflow increases turbine efficiency.
Reference will now be made to
Reference will now be made to
Reference will now be made to
At this point it should be understood that the exemplary embodiments describe a squeeler pocket that is designed to deliver a substantially unobstructed fluid flow to the bleed passage to reduce working fluid spillage over a tip portion of a turbine blade. The substantiality continuous curvilinear side portions of the squeeler pocket reduces abrupt pressure increases resulting from sudden flow area reductions in the bleed passage. The bleed passage directs the fluid from the squeeler pocket through a surface of the turbine blade so as to reduce losses. That is, the working fluid that has passed into the squeeler pocket is guided back into the turbine portion to remix with the working fluid flowing along the hot gas path.
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
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