Abstract

A three-dimensional optimization procedure on the basis of a transitional Navier-Stokes code has been developed and tested. It allows complete three-dimensional parameterization of the flow channel for improved engine component design. Both the aerofoils and the end walls are three-dimensionally parameterized to permit full design control over the wetted surface. The end wall curvature is in fact controlled by the superposition of an axisymmetric and a nonaxisymmetric parameterization. The target comprises profile and secondary losses. The optimization procedure was applied to a low-loss turbine vane and resulted in an aerodynamic design with considerably reduced losses. Vanes and end walls were then manufactured according to this optimization. The high-speed cascade wind tunnel measurements performed on these parts confirm the computational results.

Issue Section:
Technical Papers
Keywords:
computational fluid dynamics, Navier-Stokes equations, aerodynamics, channel flow, flow simulation, optimisation, turbines
Topics:
Cascades (Fluid dynamics), Design, Flow (Dynamics), Optimization, Turbines, Pressure, Blades, Airfoils
1.
Rechenberg, 1973.
2.
LaFleur
,
R. S.
, and
Langston
,
L. S.
,
1993
, “
Drag Reduction of a Cylinder/Endwall Junction Using the Ice Formation Method
,”
ASME J. Fluids Eng.
,
115
.
3.
Bischoff, H., 1983, Patentschrift DE 3202855 C1, MTU Motoren- und Turbinen Union, Munich.
4.
Rose, M. G., 1994, “Non-Axisymmetric Endwall Profiling in the HP NGV’s of an Axial Flow Gas Turbine,” ASME Paper 94-GT-249.
5.
Hartland, J. C., Gregory-Smith, D. G., Harvey, N. W., and Rose, M. G., 1999, “Non-Axisymmetric Turbine End Wall Design: Part II Experimental Validation,” ASME Paper 99-GT338.
6.
Rose, M. G., Harvey, N. W., Seaman P., Newman D. A., and McManus D., 2001, “Improving the Efficiency of the TRENT 500 HP Turbine Using Non-Axisymmetric End Walls: Part 2, Experimental Validation,” ASME Paper 2001-GT-0505.
7.
Harvey, N. W., Brennan G., Newman, D. A., and Rose, M. G., 2002, “Improving Turbine Efficiency Using Non-Axisymmetric End Walls: Validation in the Multi-Row Environment and With Low Aspect Ratio Blading,” ASME Paper GT-2002-30337.
8.
Hartland, J. C., and Gregory-Smith, D. G., 2002, “A Design Method for the Profiling of End Walls in Turbines,” ASME Paper GT-2002-30433.
9.
Spellucci P.: DONLP2, User’s Guide, Technical University Darmstadt, FB4, AG8.
10.
Gier, J., Ardey, S., Eymann, S., Reinmo¨ller, U., and Niehuis, R., 2002, “Improving 3D Flow Characteristics in a Multistage LP Turbine by Means of Endwall Contouring and Airfoil Design Modification. Part 2: Numerical Simulation and Analysis,” ASME Paper 2002-GT-30353.
11.
Abu-Ghannam
,
B. J.
, and
Shaw
,
R.
,
1980
, “
Natural Transition of Boundary Layers—The Effects of Turbulence, Pressure Gradient, and Flow History
,”
J. Mech. Eng. Sci.
,
22
(5).
12.
Gier, J., Ardey, S., and Heisler, A., 2000, “Analysis of Complex Three-Dimensional Flow in a Three-Stage LP Turbine By Means of Transitional Navier-Stokes Simulation,” ASME 2000-GT-0645.
13.
Nagel, M., Fottner, L., and Baier, R.-D., 2001, Optimization of Three Dimensionally Designed Turbine Blades and Side Walls, Bangalore ISABE-2001-1058.
14.
Baier, R.-D., 2001, “Dreidimensionale Schaufelkanalgestaltung: Umfangskonturierung der Seitenwand von Turbinenbeschaufelungen,” MTUM-N01TPA-0007, MTU Aero Engines, Munich.
15.
Duden, A., Raab, I., and Fottner, L., 1998, Controlling the Secondary Flows in a Turbine Cascade by 3D Airfoil Design and Endwall Contouring. ASME Paper 98-GT-72.
16.
Duden, A., 1999, “Stro¨mungsbeeinflussung zur Reduzierung der Sekunda¨rstro¨mungen in Turbinengittern,” dissertation, Universita¨t der Bundeswehr Mu¨nchen.
Copyright © 2005
 by ASME
You do not currently have access to this content.