The optimum speed range for radial gas turbines is given and the practical advantages of this type of turbine are discussed with reference to some current applications. One-dimensional flow considerations are briefly reviewed and the representation of nozzle and rotor loss data described. Two- and three-dimensional flows in the rotor turbine are examined in the light of recent numerical techniques. Comparison is made of the predictions in the rotor losses using these techniques and some experimental results.
The design performance of a small radial gas turbine is given. The mechanical and thermal stresses of rotor life together with materials and methods of manufacture are examined. The results of service experience are reviewed with particular reference to rotor and nozzle life. Future trends in development of the radial gas turbine are indicated.
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References
1.
Von der NuellW. T.‘Single-stage radial turbines for gaseous substances with high rotative speeds and low specific speeds’, Trans. Am. Soc. mech. Engrs195274, 499.
2.
Von der NuellW. T.The radial turbine, Air Material Command Technical Report No. F-TR-2149-ND, Wright Field, Dayton, Ohio, January 1948.
3.
BensonR. S.Performance characteristics of radial gas turbines, Parts I to IV (Internal Report, University of Manchester Institute of Science and Technology).
4.
BensonR. S.‘An analysis of the losses in a radial gas turbine’, Proc. Instn mech. Engrs1965–66180 (Pt 3J), 41.
5.
BensonR. S.CartwrightW. G.DasS. K.‘An investigation of the losses in the rotor of a radial flow gas turbine at zero incidence’, Proc. Instn mech. Engrs1967–68182 (Pt 3H), 221.
6.
FutralS. M.WasserbauerC. A.‘Off-design performance prediction with experimental verification for a radial-inflow turbine’, N.A.S.A. TN D-2621, 1965.
7.
BaljeO. E.‘A contribution to the problem of designing radial turbomachines’, Trans. Am. Soc. mech. Engrs195274, 451.
8.
BridleE. A.BoulterR. A.‘A simple theory for the prediction of losses in the rotors of inward radial flow turbines’, Proc. Instn mech. Engrs1967–68182 (Pt 3H), 393.
9.
BensonR. S. Contribution to discussion, Ref. (8).
10.
JamiesonA. W. H.‘The radial turbine’, Gas turbine principles and practice, edited by Roxbee-CoxH.Sir, 1955, Chapter 9 (George Wenner, London).
11.
WallaceF. J.‘Theoretical assessment of the performance characteristics of inward radial flow turbines’, Proc. Instn mech. Engrs1958172, 931.
12.
ArigaI.WatanabeI.FujieK.‘Investigations concerning flow patterns within the impeller channels of radial inflow turbines, with some reference to the influence of the splitter vanes’, Trans. Am. Soc. mech. Engrs1967 (Oct.), 463.
13.
WoollattG.‘Three-dimensional flow in mixed flow turbines’, M.Sc. thesis, University of Manchester, 1968.
14.
BetzA.Introduction to the theory of flow machines1966 (Pergamon Press).
15.
HiettG. F.JohnstonI. H.‘Experiments concerning the aerodynamic performance of inward radial flow turbines’, Proc. Instn mech. Engrs1963–64178 (Pt 3I), 41.
AinleyD. G.MathiesonG. C. R.‘An examination of the flow and pressure losses in blade rows of axial flow turbines’, A.R.C. R. & M. Z891, 1955.
18.
RudenP.‘Investigation of single stage axial fans’, N.A.C.A. TM 1062, 1944.
19.
WuChung-Hua‘A general theory of three-dimensional flow in subsonic and supersonic turbomachines of axial, radial and mixed-flow types’, N.A.C.A. TN 2604, 1952.
20.
EllisG. O.StanitzJ. D.‘Comparison of two- and three-dimensional potential flow solutions in a rotating impeller passage’, N.A.C.A. TN 2806, 1952.
21.
StanitzJ. D.‘Two-dimensional compressible flow in turbomachines with conic flow surfaces’, N.A.C.A. Report No. 935, 1949.
22.
StanitzJ. D.EllisG. O.‘Two-dimensional compressible flow in centrifugal compressors with straight blades’, N.A.C.A. Report No. 954, 1950.
23.
StanitzJ. D.EllisG. O.‘Two-dimensional compressible flow in centrifugal compressors with logarithmic-spiral blades’, N.A.C.A. TN 2255, 1951.
24.
EllisG. O.StanitzJ. D.SheldrakeL. J.‘Two axial-symmetry solutions for incompressible flow through a centrifugal compressor with and without inducer vanes’, N.A.C.A. TN 2464, 1951.
25.
StanitzJ. D.‘Some theoretical aerodynamic investigations of impellers in radial- and mixed-flow centrifugal compressors’, Trans. Am. Soc. mech. Engrs195274, 473.
26.
StanitzJ. D.EllisG. O.‘Two-dimensional flow on general surfaces of revolution in turbomachines’, N.A.C.A. TN 2654, 1952.
27.
WuChung-Hua‘A general through-flow theory of fluid flow with subsonic or supersonic velocity in turbomachines of arbitrary hub and casing shapes’, N.A.C.A. TN 2302, 1951.
28.
MarshH.‘A digital computer program for the through-flow fluid mechanics in an arbitrary turbomachine using a matrix method’, N.G.T.E. Report No. R.282, 1966 (July).
29.
WuChung-HuaBrownC. A.‘Method of analysis for compressible flow past arbitrary turbomachine blades on general surfaces of revolution’, N.A.C.A. TN 2407, 1951.
30.
WuChung-HuaCostilowE. L.‘A method of solving the direct and inverse problem of supersonic flow along arbitrary stream filaments of revolution in turbomachines’, N.A.C.A. TN 2492, 1951.
31.
PrianV. D.KramerJ. J.WuChung-Hua‘Theoretical analysis of incompressible flow through a radial-inlet centrifugal impeller at various weight flows. I—Solution by a matrix method and comparison with an approximate method’, N.A.C.A. TN 3448, 1955.
32.
KramerJ. J.‘Theoretical analysis of incompressible flow through a radial-inlet centrifugal impeller at various weight flows. II—Solutions in leading-edge region by relaxation methods’, N.A.C.A. TN 3449, 1955.
33.
KramerJ. J.‘Analysis of incompressible, non-viscous blade to blade flow in rotating blade rows’, Trans. Am. Soc. mech. Engrs195880 (No. 1, Jan.), 263.
34.
KramerJ. J.StockmannN. O.BeanR. J.‘Non-viscous flow through a pump impeller on a blade to blade surface of revolution’, N.A.S.A. TN D-1108, 1962.
35.
SmithK. J.HamrickJ. T.‘A rapid approximate method for the design of hub shroud profiles of centrifugal compressors of given blade shape’, N.A.C.A. TN 3399, 1955.
36.
StanitzJ. D.PrianV. D.‘A rapid approximate method for determining velocity distribution on impeller blades of centrifugal compressors’, N.A.C.A. TN 2421, 1951.
37.
HamrickJ. T.GinsburgA.OsbornW. M.‘Method of analysis for compressible flow through mixed-flow centrifugal impellers of arbitrary design’, N.A.C.A. Report 1082, 1952.
38.
KramerJ. J.StockmanN. O.BeanR. J.‘Incompressible non-viscous blade to blade flow through a pump rotor with splitter vanes’, N.A.S.A. TN D-1186, 1962.
39.
OsbornW. MSmithK. J.HamrickJ. T.‘Design and test of mixed-flow impellers. VIII—Comparison of experimental results for three impellers with shroud redesigned by rapid approximate method’, N.A.C.A. RM E56L07, 1957.
40.
KramerJ. J.OsbornW. M.HamrickJ. T.‘Design and test of mixed-flow and centrifugal impellers’, Trans. Am. Soc. mech. Engrs1960 (Apr.) 82, 127.
41.
StockmanN. O.KramerJ. L.‘Method for design of pump impellers using a high-speed digital computer’, N.A.S.A. TN D-1562, 1963.
42.
WoodM. D.MarlowA. V.‘The use of numerical methods for the investigation of flow in water pump impellers’, Proc. Instn mech. Engrs1966–67181 (Pt 1), No. 29.
43.
KatsanisT.‘Use of arbitrary quasi-orthogonals for calculating flow distribution in the meridional plane of a turbomachine’, N.A.S.A. TN D-2546, 1964.
44.
KatsanisT.‘Use of arbitrary quasi-orthogonals for calculating flow distribution on a blade to blade surface in a turbomachine’, N.A.S.A. TN D-2809, 1965.
45.
KatsanisT.‘Computer program for calculating flow distribution in a radial-inflow turbine’, N.A.S.A. TM X-52161, 1965.
