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Abstract

A design method for profiling the end wall to reduce secondary flow has been reported previously. A profile has been tested in the Durham Linear Cascade and the results confirmed the design method. This paper describes the design and testing of a second-generation end wall, where the profiling is more suited to a real turbine. The new end wall has been tested in the linear cascade and a comprehensive set of measurements have been taken. These include traverses of the flow field upstream and downstream of the blade row, surface static pressure distributions on the end wall and flow visualization. Comparisons have been made with the results with a planar end wall and the earlier profiled end wall. Observed reductions in exit angle deviations are even greater than for the first design, although the loss reduction is not as great. The results verify the design, confirming profiled end walls as a means of reducing secondary flow, kinetic energy and loss. Overall an improved understanding of the effects of end wall profiling has been obtained although further work is required in this area.

Keywords

turbines turbomachinery end walls profiling non-axisymmetric secondary flow

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References

Sieverding

C. H.

Recent progress in the understanding of basic aspects of secondary flows in turbine blade passages. Trans. ASME, J. Engng Gas Turbines Pwr, 1985, 107, 248–252.

Harrison

Secondary loss generation in a linear cascade of high-turning turbine blades. ASME paper 89-GT-47, 1989.

Deich

M. E.

Zaryankin

A. E.

Filippov

G. A.

Zatsepin

M. F.

Method of increasing the efficiency of turbine stages with short blades. Translation 2816, AEI (Manchester) Limited, 1960 (Teploenergetika, February 1960, (2), 18-24).

Morris

A. W. H.

Hoare

R. G.

Secondary loss measurements in a cascade of turbine blades with meridional wall profiling. ASME paper 75-WA/GT-13, 1975.

Ewen

J. S.

Huber

F. W.

Mitchell

J. P.

Investigation of the aerodynamic performance of small axial turbines. J. Engng Pwr, 1973, 95, 326–332.

Boletis

Effect of tip endwall contouring on the three dimensional flow-field in an annular turbine nozzle guide vane: Part 1experimental investigation. J. Engng Gas Turbines Pwr, 1985, 107, 983–990.

Atkins

M. J.

Secondary losses and endwall profiling in a turbine cascade. In Proceedings of IMechE Conference, 1987, paper C255/87 pp. 29–42.

Rose

M. G.

Non-axisymmetric endwall profiling in the HP NGVs of an axial flow gas turbine. ASME paper 94-GT-249, 1994.

Hartland

J. C.

Gregory-Smith

D. G.

Rose

M. G.

Non-axisymmetric end wall profiling in a turbine rotor blade. ASME paper 98-GT-525, 1998.

10.

Yan

P. J.

Gregory-Smith

D. G.

Walker

P. J.

Secondary flow reduction in a nozzle guide vane cascade by non-axisymmetric end-wall profiling. ASME paper 99-GT-339, 1999.

11.

Harvey

N. W.

Rose

M. G.

Shahpar

Taylor

M. D.

Hartland

Gregory-Smith

D. G.

Non-axisymmetric turbine end wall design: Part I. Three-dimensional design system. J. Turbomachinery, 2000, 122, 278–285; also ASME paper 99-GT-337, 1999.

12.

Moore

J. G.

Calculation of 3D flow without numerical mixing. In AGARD-LS-140, 1985, pp. 8. 1–8.14.

13.

Hartland

Gregory-Smith

D. G.

Harvey

N. W.

Rose

M. G.

Non-axisymmetric end wall design: Part II. Experimental validation. J. Turbomachinery, 2000, 122, 286–293; also ASME paper 99-GT-338, 1999.

14.

Gregory-Smith

D. G.

Cleak

J. G. E.

Secondary flow measurements in a turbine cascade with high inlet turbulence. J. Turbomachinery, 1992, 114, 173–183; also ASME paper 90-GT-20, 1990.

15.

Jayaraman

An investigation of secondary flow in a turbine blade with end wall profiling. MSc thesis, University of Durham, 2000.

16.

Cleak

J. G. E.

Validation of viscous, three-dimensional flow calculations in an axial turbine cascade. PhD thesis, University of Durham, 1989.

17.

Gregory-Smith

D. G.

Calculations of the secondary flow in a turbine cascade. In International Symposium on Computational Fluid Dynamics in Aeropropulsion, ASME International ME1995 Congress and Exposition, AD-Vol. 49, 1995.

18.

Moore

Gregory-Smith

D. G.

Transition effects on secondary flows in a turbine cascade. ASME paper 96-GT-100, 1996.

Non-axisymmetric turbine end wall profiling

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