This paper presents the second part of an investigation of the combined effects of unsteadiness and surface roughness on an aft-loaded ultra-high-lift low-pressure turbine (LPT) profile at low Reynolds numbers. The investigation has been performed using low- and high-speed cascade facilities. The low- and high-speed profiles have been designed to have the same normalized isentropic Mach number distribution. The low-speed results have been presented in the first part (Zhang, Vera, Hodson, and Harvey, 2006, ASME J. Turbomach., 128, pp. 517–527). The current paper examines the effect of different surface finishes on an aft-loaded ultra-high-lift LPT profile at Mach and Reynolds numbers representative of LPT engine conditions. The surface roughness values are presented along with the profile losses under steady and unsteady inflow conditions. The results show that the use of a rough surface finish can be used to reduce the profile loss. In addition, the results show that the same quantitative values of losses are obtained at high- and low-speed flow conditions. The latter proves the validity of the low-speed approach for ultra-high-lift profiles for the case of an exit Mach number of the order of 0.64. Hot-wire measurements were carried out to explain the effect of the surface finish on the wake-induced transition mechanism.
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April 2007
Technical Papers
Separation and Transition Control on an Aft-Loaded Ultra-High-Lift LP Turbine Blade at Low Reynolds Numbers: High-Speed Validation
Maria Vera,
Maria Vera
Whittle Laboratory,
University of Cambridge
, UK
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Xue Feng Zhang,
Xue Feng Zhang
Whittle Laboratory,
University of Cambridge
, UK
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Howard Hodson,
Howard Hodson
Whittle Laboratory,
University of Cambridge
, UK
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Neil Harvey
Neil Harvey
Compression Systems,
Rolls-Royce plc
, Derby, UK
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Maria Vera
Whittle Laboratory,
University of Cambridge
, UK
Xue Feng Zhang
Whittle Laboratory,
University of Cambridge
, UK
Howard Hodson
Whittle Laboratory,
University of Cambridge
, UK
Neil Harvey
Compression Systems,
Rolls-Royce plc
, Derby, UKJ. Turbomach. Apr 2007, 129(2): 340-347 (8 pages)
Published Online: May 30, 2006
Article history
Received:
May 17, 2006
Revised:
May 30, 2006
Citation
Vera, M., Zhang, X. F., Hodson, H., and Harvey, N. (May 30, 2006). "Separation and Transition Control on an Aft-Loaded Ultra-High-Lift LP Turbine Blade at Low Reynolds Numbers: High-Speed Validation." ASME. J. Turbomach. April 2007; 129(2): 340–347. https://doi.org/10.1115/1.2437220
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