Third-stage turbine nozzle airfoil

Abstract

The third-stage nozzles have vanes comprising 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 coordinate values 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 each nozzle vane.

Description

BACKGROUND OF THE INVENTION

The present invention relates to a turbine nozzle for a gas turbine stage and particularly relates to a third-stage turbine nozzle 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 air cooling is undergoing development. It will be appreciated that the design and construction of the turbine buckets and nozzles require optimized aerodynamic efficiency, as well as aerodynamic and mechanical loading.

BRIEF SUMMARY OF THE INVENTION

In accordance with an embodiment of the present invention, there is provided a unique turbine nozzle 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 nozzle vane. 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 nozzle heats up in use, the profile of the nozzle vane will change as a result of stress and temperature. Thus, the cold or room-temperature profile is given by the X, Y and Z coordinates for manufacturing purposes. Because a manufactured nozzle airfoil profile may be different than the nominal airfoil profile given in the following table, a distance of ±0.100 inches from the nominal profile in a direction normal to any surface location along the nominal profile and which includes any coating, defines the profile envelope for this design. The design is robust to this variation without 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 nozzle airfoil profile, while retaining the airfoil section shape.

In a preferred embodiment according to the present invention, there is provided a turbine nozzle having a nozzle vane in the shape of an airfoil in an envelope within ±0.100 inches in a direction normal to any airfoil surface location wherein the airfoil has an uncoated nominal profile 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 a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values 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 nozzle having a nozzle vane in the shape of an airfoil having an uncoated nominal airfoil profile 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 a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values 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 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 nozzle airfoil.

In a further preferred embodiment according to the present invention, there is provided a turbine comprising a turbine nozzle having a plurality of vanes, each of said vanes being in the shape of an airfoil in an envelope within ±0.100 inches in a direction normal to any nozzle airfoil surface location wherein the airfoil has an uncoated nominal profile 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 a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values 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 nozzle having a plurality of vanes, each of said vanes being in the shape of an airfoil having an uncoated nominal airfoil profile 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 coordinate values 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, Y and Z values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down nozzle airfoil.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of a turbine having a third-stage nozzle employing the airfoil or vane profile hereof;

FIG. 2 is a perspective view of a nozzle segment illustrating the vanes thereof;

FIGS. 3 and 4 are end views from respective radially outer and inner portions of the nozzle vanes illustrated in FIG. 2 ;

FIG. 5 is a perspective view of a nozzle vane illustrating various airfoil profiles along the length of the vane; and

FIG. 6 is a view similar to FIG. 3 illustrating the profile sections at various radial locations along the vane.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to FIG. 1 , there is illustrated a portion of a turbine, generally designated 10 , having multiple stages including a third-stage, generally designated 12 . Third-stage 12 includes a plurality of nozzles comprising vanes 14 having an airfoil shape or profile spaced circumferentially one from the other. The illustrated turbine 10 includes three stages, a first stage 16 having a plurality of circumferentially spaced nozzle vanes 18 and buckets 20 circumferentially spaced about a rotatable turbine wheel 22 ; a second stage 24 comprising a plurality of circumferentially spaced nozzle vanes 26 and a plurality of circumferentially spaced buckets 28 mounted on a second-stage wheel 30 and the third-stage 12 comprising a plurality of circumferentially spaced nozzle vanes 14 and a plurality of circumferentially spaced buckets 32 mounted on a third-stage wheel 34 . It will be appreciated that the nozzle vanes and buckets lie in the hot gas path of the turbine and which gases flow through the turbine in the direction of the arrow 36 . As illustrated, the nozzle vanes 14 of the third stage 12 are disposed between inner and outer bands 38 and 40 , respectively, by which the nozzles form an annulus about the rotor axis.

Referring to FIG. 2 , the nozzle vanes 14 have leading and trailing edges 42 and 44 , respectively, with hooks 46 and 48 for securing the nozzle vane segments to the non-rotatable casing of the turbine. As will be appreciated, the nozzle vanes have various passages therethrough for cooling the vanes. In the preferred and illustrated embodiment of the third-stage nozzle for this particular turbine, there are sixty nozzle vanes forming the third stage.

Referring now to drawing FIG. 2 , there is illustrated a nozzle vane 14 for the third stage having airfoil profiles defined by a Cartesian coordinate system for X, Y and Z values. The 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 X 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 14 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 coordinate values, as typically used in a Cartesian coordinate system.

The Table I values are generated and shown to four decimal places for determining the profiles of the airfoil. Where the values are carried out to less than four decimal places, zeros are added to the right to complete the value to four decimal places. 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 ±0.100 inches in a direction normal to any surface location along the airfoil profile defines an airfoil profile envelope for this particular nozzle vane design and turbine. In a preferred embodiment, the nozzle vane profiles given in Table I below are for the third stage of the turbine. Sixty nozzle vanes having such profiles are equally spaced from one another about the rotor axis and thus comprise the third stage.

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

TABLE I
X Coordinate	Y Coordinate	Z Coordinate
−5.3141	10.0979	18.1342
−5.0139	9.5505	18.1342
−6.7466	9.2005	18.1342
−5.1074	10.0329	18.1342
−5.2692	10.0963	18.1342
−5.4679	10.092	18.1342
−6.8847	8.6041	18.1342
−5.9787	9.9584	18.1342
−5.3404	10.0975	18.1342
−5.0935	9.0127	18.1342
−5.2816	10.0976	18.1342
−4.9998	9.8073	18.1342
−5.8385	10.0001	18.1342
−5.195	10.0792	18.1342
−6.8322	8.9151	18.1342
−6.479	9.6519	18.1342
−5.09	8.2923	18.1342
−5.0383	9.3924	18.1342
−5.5356	10.0809	18.1342
−5.0585	9.9819	18.1342
−5.2533	10.0949	18.1342
−5.2763	10.0971	18.1342
−5.7202	10.0366	18.1342
−6.31	9.7995	18.1342
−5.1092	8.7893	18.1342
−5.0009	9.6884	18.1342
−5.3732	10.0977	18.1342
−5.1544	10.0622	18.1342
−5.2763	10.0971	18.1342
−6.6276	9.4501	18.1342
−5.0489	8.0288	15.1342
−5.2936	10.099	18.1342
−5.0657	9.2134	18.1342
−5.6196	10.0638	18.1342
−5.4147	10.0976	18.1342
−5.0181	9.9071	18.1342
−5.2271	10.0894	18.1342
−6.9111	8.2769	18.1342
−6.1383	9.8972	18.1342
−5.1094	8.5475	18.1342
−6.7764	6.8429	18.1342
−4.9856	7.7589	18.1342
−6.8502	7.2166	18.1342
−4.675	6.9198	18.1342
−4.3907	6.3509	18.1342
−6.8942	7.5816	18.1342
−4.9012	7.4836	18.1342
−6.5218	6.1025	18.1342
−6.9134	7.9355	18.1342
−4.5382	6.6347	18.1342
−4.236	6.071	18.1342
−6.6679	6.4686	18.1342
−4.7973	7.2037	13.1342
−3.1955	4.4604	18.1342
−4.0756	5.7945	18.1342
−4.3751	3.8528	18.1342
−5.6097	4.8269	18.1342
−2.5934	3.7185	18.1342
−3.5639	4.9832	18.1342
−4.7007	4.0742	18.1342
−5.8791	5.1145	18.1342
−3.0015	4.2062	18.1342
−3.9099	5.521	18.1342
−5.0168	4.309	18.1342
−6.1237	5.4233	18.1342
−5.3209	4.5592	18.1342
−3.3827	4.7197	18.1342
−6.3394	5.753	18.1342
−2.8002	3.9578	18.1342
−3.7394	5.2504	18.1342
−3.7085	3.4421	18.1342
−0.0411	1.6954	18.1342
−0.4628	1.7853	18.1342
−0.4094	1.9153	18.1342
−0.1781	1.6542	18.1342
−1.161	2.4207	18.1342
0.0274	1.5822	18.1342
−2.174	3.279	18.1342
−0.9282	2.0021	18.1342
−2.7438	2.9088	18.1342
0.0454	1.6382	18.1342
−0.1493	1.7585	18.1342
−0.6612	2.0753	18.1342
−0.0673	1.6033	18.1342
−1.5543	2.725	18.1342
−1.6023	2.3263	18.1342
0.041	1.5994	18.1342
−1.8688	2.4584	18.1342
−3.3779	3.2536	18.1342
−0.004	1.673	18.1342
−0.5954	1.8465	18.1342
−0.3081	1.8535	18.1342
−0.2559	1.69	18.1342
−0.9791	2.2902	18.1342
0.0012	1.5727	18.1342
−1.9652	3.0809	18.1342
−1.1298	2.0976	18.1342
−2.4417	2.7504	18.1342
0.0477	1.6159	18.1342
−4.0426	3.6419	18.1342
−0.0894	1.7232	18.1342
−0.5268	1.9888	18.1342
−0.1159	1.6254	18.1342
−1.3541	2.5659	18.1342
0.0378	1.5937	18.1342
−2.3837	3.4914	18.1342
−0.75	1.9185	18.1342
−3.0562	3.076	18.1342
0.0261	1.6581	18.1342
−0.2218	1.8018	18.1342
−0.3502	1.7338	18.1342
−0.8122	2.1755	18.1342
−0.0305	1.5858	18.1342
−1.7585	2.8964	18.1342
−1.3546	2.2056	18.1342
−2.1499	2.6004	18.1342
0.0436	1.604	18.1342
−5.052	9.1157	17.6211
−5.0201	9.8027	17.6211
−5.2174	9.9929	17.6211
−5.3008	10.0057	17.6211
−5.5171	9.9966	17.6211
−6.1102	9.817	17.6211
−5.0816	8.4569	17.6211
−6.8039	8.8435	17.6211
−5.011	9.4503	17.6211
−5.1023	9.9308	17.6211
−5.2586	10.0019	17.6211
−5.3593	10.0078	17.6211
−5.7002	9.9583	17.6211
−6.4403	9.5681	17.6211
−5.0732	8.9167	17.6211
−6.8989	8.2146	17.6211
−5.0029	9.7042	17.6211
−5.1862	9.9815	17.6211
−5.2813	10.0049	17.6211
−5.4501	10.005	17.6211
−5.9545	9.8826	17.6211
−5.0615	8.2048	17.6211
−6.7106	9.1272	17.6211
−5.03	9.2934	17.6211
−5.0567	9.8786	17.6211
−5.243	9.9997	17.6211
−5.3267	10.0065	17.6211
−5.6003	9.982	17.6211
−6.2764	9.7157	17.6211
−5.0843	8.6957	17.6211
−6.8651	8.5377	17.6211
−5.0013	9.5868	17.6211
−5.147	9.9629	17.6211
−5.2656	10.0029	17.6211
−5.2656	10.0029	17.6211
−5.3982	10.0084	17.6211
−5.2813	10.0049	17.6211
−5.818	9.9257	17.6211
−6.588	9.3707	17.6211
−6.9075	7.8768	17.6211
−6.5081	6.0631	17.6211
−4.7862	7.1252	17.6211
−6.8473	7.1651	17.6211
−4.4023	6.2743	17.6211
−4.9624	7.677	17.6211
−6.6578	6.4231	17.6211
−4.6715	6.8421	17.6211
−6.8912	7.5263	17.6211
−4.2542	5.9952	17.6211
−4.5835	7.4037	17.6211
−6.7712	6.796	17.6211
−4.5424	6.5575	17.6211
−5.022	7.9444	17.6211
−3.2286	4.4027	17.6211
−5.309	4.5434	17.6211
−4.0992	5.7199	17.6211
−6.1067	5.3958	17.6211
−3.5964	4.9165	17.6211
−4.6962	4.0614	17.6211
−3.034	4.1538	17.6211
−5.5951	4.8084	17.6211
−3.9378	5.4483	17.6211
−6.3234	5.7199	17.6211
−3.416	4.6572	17.6211
−5.0084	4.2951	17.6211
−2.8316	3.9112	17.6211
−5.8625	5.092	17.6211
−3.7702	5.1804	17.6211
−4.3749	3.8404	17.6211
−1.1927	2.4126	17.6211
−0.4969	1.7837	17.6211
−2.203	3.2498	17.6211
−0.1075	1.6047	17.6211
0.0006	1.6415	17.6211
−3.7133	3.4276	17.6211
−0.1913	1.761	17.6211
−2.1719	2.5893	17.6211
−0.6973	2.0737	17.6211
−0.9566	1.9972	17.6211
−1.5839	2.71	17.6211
−0.2927	1.6898	17.6211
−2.6238	3.6778	17.6211
−0.0411	1.5802	17.6211
−0.004	1.6031	17.6211
−0.048	1.6762	17.6211
−3.069	3.0619	17.6211
−0.004	1.6031	17.6211
−0.3481	1.8549	17.6211
−1.6251	2.3169	17.6211
−1.0122	2.2848	17.6211
−0.6267	1.8435	17.6211
−1.994	3.0569	17.6211
−0.1547	1.6264	17.6211
−0.004	1.6031	17.6211
0.0026	1.6194	17.6211
−4.0468	3.6297	17.6211
−0.1321	1.7259	17.6211
−2.461	2.7379	17.6211
−0.5643	1.9885	17.6211
−1.1565	2.0915	17.6211
−1.3846	2.5546	17.6211
−0.3858	1.7328	17.6211
−2.4132	3.4566	17.6211
−0.0721	1.5885	17.6211
−0.0182	1.6613	17.6211
−3.3869	3.239	17.6211
−0.2629	1.8038	17.6211
−1.8932	2.4491	17.6211
−0.8469	2.1722	17.6211
−0.78	1.9146	17.6211
−1.7875	2.8771	17.6211
−0.216	1.6546	17.6211
−0.0169	1.5888	17.6211
−0.0014	1.6077	17.6211
−0.0845	1.6984	17.6211
−2.7601	2.8952	17.6211
−0.4482	1.916	17.6211
−1.3794	2.1979	17.6211
−6.2049	9.4384	15.9099
−6.8255	8.3099	15.9099
−5.0022	8.6028	15.9099
−5.009	9.3629	15.9099
−5.235	9.69	15.9099
−5.1592	9.6532	15.9099
−5.3597	9.7172	15.9099
−5.7736	9.6737	15.9099
−6.5035	9.0969	15.9099
−4.9966	8.9672	15.9099
−5.0561	9.5323	15.9099
−5.2649	9.6987	15.9099
−5.2097	9.6806	15.9099
−5.4768	9.7226	15.9099
−6.0511	9.5492	15.9099
−6.7424	8.6011	15.9099
−4.9995	8.3902	15.9099
−4.9985	9.2506	15.9099
−5.2303	9.6883	15.9099
−5.1265	9.6282	15.9099
−5.3203	9.7112	15.9099
−5.2303	9.6883	15.9099
−5.658	9.7024	15.9099
−6.3584	9.2881	15.9099
−6.8808	7.9993	15.9099
−5	8.7951	15.9099
−5.0276	9.4567	15.9099
−5.2458	9.6935	15.9099
−5.1868	9.6697	15.9099
−5.4109	9.7216	15.9099
−5.9055	9.6252	15.9099
−6.6338	8.8659	15.9099
−4.9886	8.1609	15.9099
−4.9951	9.119	15.9099
−5.0905	9.5887	15.9099
−5.2894	9.7047	15.9099
−5.2239	9.6861	15.9099
−5.559	9.7175	15.9099
−4.8876	7.4087	15.9099
−6.7751	6.6242	15.9099
−4.6643	6.5886	15.9099
−4.9672	7.9189	15.9099
−6.9067	7.6722	15.9099
−6.4904	5.9282	15.9099
−4.8276	7.142	15.9099
−6.8575	6.9809	15.9099
−4.5612	6.3064	15.9099
−4.9339	7.6679	15.9099
−6.6519	6.2706	15.9099
−4.7533	6.8684	15.9099
−6.9001	7.3316	15.9099
−4.4452	6.0257	15.9099
−5.829	5.0088	15.9099
−3.1371	3.9894	15.9099
−4.3841	3.7951	15.9099
−4.0306	5.2147	15.9099
−5.2856	4.4829	15.9099
−3.5227	4.4587	15.9099
−4.3179	5.7499	15.9099
−6.074	5.297	15.9099
−2.9317	3.7656	15.9099
−4.6931	4.013	15.9099
−3.8713	4.9561	15.9099
−5.5649	4.7379	15.9099
−3.3343	4.2204	15.9099
−4.1796	5.4794	15.9099
−6.2961	5.6034	15.9099
−4.9942	4.2418	15.9099
−3.7018	4.704	15.9099
−1.9927	2.4294	15.9099
−0.4822	1.8599	15.9099
−0.9144	1.9189	15.9099
−1.1238	2.2682	15.9099
−0.3644	1.6664	15.9099
−2.0884	2.9835	15.9099
−0.1668	1.5991	15.9099
−0.1473	1.6312	15.9099
−2.8333	2.8618	15.9099
−0.2749	1.7353	15.9099
−1.4967	2.191	15.9099
−0.6903	1.9878	15.9099
−0.6381	1.7917	15.9099
−1.4869	2.5203	15.9099
−0.2578	1.618	15.9099
−2.5082	3.3493	15.9099
−0.1537	1.6156	15.9099
−3.752	3.3876	15.9099
−0.166	1.6722	15.9099
−2.2634	2.5645	15.9099
−0.4003	1.8107	15.9099
−1.0858	1.9986	15.9099
−0.9634	2.1621	15.9099
−0.4392	1.7006	15.9099
−1.8834	2.8184	15.9099
−0.1917	1.5895	15.9099
−0.1512	1.62	15.9099
−3.1316	3.0254	15.9099
−0.2293	1.7085	15.9099
−1.7357	2.3048	15.9099
−0.5784	1.9185	15.9099
−0.7656	1.8503	15.9099
−1.2994	2.388	15.9099
−0.3046	1.639	15.9099
−2.2971	3.1601	15.9099
−0.1568	1.6102	15.9099
−4.0688	3.5863	15.9099
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−4.6678	7.1449	0.5131
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−3.9445	3.8499	0.5131
−4.4494	4.7602	0.5131
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−4.7367	7.2041	0
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−4.7946	7.2781	0
−4.9554	7.3568	0
−4.6346	7.0018	0
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−5.9407	6.4384	0
−4.6131	6.0299	0
−4.59	6.7384	0
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−4.5881	6.6221	0
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−4.6067	6.194	0
−4.5991	6.8407	0
−5.7299	6.7888	0
−6.0992	5.7819	0
−4.6112	5.6811	0
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−4.1704	4.1611	0
−6.0445	5.2898	0
−4.5406	5.1113	0
−3.8173	3.6573	0
−4.3557	4.5272	0
−5.8563	4.8032	0
−4.5987	5.4968	0
−5.0423	3.7884	0
−4.0617	3.987	0
−6.0897	5.5382	0
−4.4922	4.9142	0
−4.2687	4.3413	0
−5.9646	5.041	0
−4.5758	5.3066	0
−5.2308	3.9696	0
−3.9436	3.8191	0
−4.4304	4.7185	0
−5.7247	4.5773	0
−4.8449	3.6169	0
−2.787	2.3292	0
−3.5445	3.3508	0
−2.0527	1.9463	0
−1.5364	1.7439	0
−1.6814	1.7578	0
−1.6059	1.8258	0
−1.5495	1.7233	0
−1.8792	2.0079	0
−4.4295	3.2993	0
−2.4086	2.3806	0
−3.3616	2.6409	0
−3.1046	2.9336	0
−2.4477	2.1503	0
−1.8662	1.8516	0
−1.5381	1.7749	0
−1.61	1.7216	0
−1.6885	1.8802	0
−2.0596	2.1318	0
−3.9936	3.0105	0
−2.6761	2.5824	0
−2.9714	2.4279	0
−3.3998	3.2053	0
−2.1691	2.0059	0
−1.5396	1.7365	0
−1.7318	1.7834	0
−1.5762	1.806	0
−1.5643	1.7144	0
−1.8055	1.9582	0
−4.6403	3.454	0
−2.2831	2.2896	0
−3.5667	2.7564	0
−2.9589	2.8092	0
−2.6098	2.2354	0
−3.684	3.5013	0
−1.9518	1.8949	0
−1.5346	1.7574	0
−1.641	1.7373	0
−1.6433	1.8503	0
−1.5413	1.7335	0
−1.964	2.0657	0
−4.2136	3.1518	0
−2.5403	2.4786	0
−3.1631	2.5317	0
−3.2524	3.0658	0
−2.3008	2.0738	0
−1.5413	1.7335	0
−1.7932	1.8146	0
−1.5526	1.7914	0
−1.5857	1.7123	0
−1.7422	1.9159	0
−2.1661	2.2062	0
−3.7776	2.8793	0
−2.8158	2.6925	0

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.

In FIGS. 3 and 4 , the radially outermost and innermost profiles 50 and 52 are illustrated with various other profile sections also illustrated along the length of the airfoil. The various profiles are also illustrated in the perspective view of FIG. 5 with the profiles being superposed one over the other in FIG. 6 .

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 nozzle having a nozzle vane in the shape of an airfoil in an envelope within ±0.100 inches in a direction normal to any airfoil surface location wherein the airfoil has an uncoated nominal profile 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 a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values 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 nozzle according to claim 1 forming part of a third stage of a turbine.

3. A turbine nozzle having a nozzle vane in the shape of an airfoil having an uncoated nominal airfoil profile 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 a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values 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 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 nozzle airfoil.

4. A turbine nozzle according to claim 3 forming part of a third stage of a turbine.

5. A turbine comprising a turbine nozzle having a plurality of vanes, each of said vanes being in the shape of an airfoil in an envelope within ±0.100 inches in a direction normal to any nozzle airfoil surface location wherein the airfoil has an uncoated nominal profile 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 a radially innermost aerodynamic section of the airfoil and X and Y are coordinate values 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 nozzle comprises a third stage of the turbine.

7. A turbine according to claim 5 wherein the turbine nozzle has sixty vanes and X represents a distance parallel to a rotary axis of the turbine.

8. A turbine comprising a turbine nozzle having a plurality of vanes, each of said vanes being in the shape of an airfoil having an uncoated nominal airfoil profile 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 coordinate values 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, Y and Z values being scaled as a function of the same constant or number to provide a scaled-up or scaled-down nozzle airfoil.

9. A turbine according to claim 8 wherein the turbine nozzle comprises a third stage of the turbine.

10. A turbine according to claim 8 wherein the turbine nozzle has sixty vanes and X represents a distance parallel to a rotary axis of the turbine.