High Lift and Aft-Loaded Profiles for Low-Pressure Turbines

[+] Author and Article Information
R. J. Howell, O. N. Ramesh, H. P. Hodson

Whittle Laboratory, University of Cambridge, Cambridge, United Kingdom

N. W. Harvey

Rolls Royce plc., Derby, United Kingdom

V. Schulte

BMW Rolls-Royce, GmbH, Dahlewitz, Germany

J. Turbomach 123(2), 181-188 (Feb 01, 2000) (8 pages) doi:10.1115/1.1350409 History: Received February 01, 2000
Copyright © 2001 by ASME
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Schematic of moving bar rig and cascade
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Schematic of flap and inserts used in the cascade
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Pressure distributions of datum profile and others with increased lift measured at a Reynolds number of 130,000, with unsteady airflow
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Relative trailing edge suction side boundary layer momentum thickness variation with Reynolds number for datum profile
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Variation in loss with increased lift, with and without wakes, at a Reynolds number of 130,000
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ST diagram of wake-induced transition showing two different reduced frequencies
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Aft-loaded and datum pressure distributions; all measurements carried out at Re=130,000 and with wakes present
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Variation of losses with position of peak suction
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ST diagram of nondimensional ensemble mean quasi-shear stress data from profiles H and C at a Reynolds number of 130,000, and flow coefficient of 0.7
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Relative suction side boundary losses for aft-loaded profiles measured with and without wakes present; Re=130,000
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Velocity distributions for the ultrahigh lift profiles, U1 and U2, and the datum profile H; all distributions measured with unsteady inflow; velocities are made nondimensional using the cascade exit velocity; Re=130,000
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Nondimensional total pressure loss variation versus Reynolds number for the datum and ultrahigh lift cascades




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