Unsteady Surface Pressures Due to Wake-Induced Transition in a Laminar Separation Bubble on a Low-Pressure Cascade

[+] Author and Article Information
R. D. Stieger, H. P. Hodson

Whittle Laboratory, Cambridge University, Engineering Department, Madingley Road, Cambridge CB3 0DY, UK

David Hollis

Department of Aeronautical and Automotive Engineering, Loughborough University, Stewart Miller Building, Leics LE 11 3TU, UK

J. Turbomach 126(4), 544-550 (Dec 29, 2004) (7 pages) doi:10.1115/1.1773851 History: Received December 01, 2002; Revised March 01, 2003; Online December 29, 2004
Copyright © 2004 by ASME
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Mounting of pressure transducers to measure unsteady blade surface pressure
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Pressure distribution measured on the T106 cascade at Re=1.6×105
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ST diagram of ensemble average Cp.Re=1.6×105,sb/sc=1.
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Ensemble-average pressure traces measured over the rear of the suction surface. Re=1.6×105,sb/sc=1.
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Ensemble-average pressure traces for Re=1.6×105,sb/sc=2
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Ensemble-average traces—tripped boundary layer, Re=1.6×105,sb/sc=2
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Effect of Reynolds number on the period of pressure oscillations at s/s0=0.70
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Location of PIV measurement on the T106 blade. The line dividing the field of view indicates the portion of the measurement shown below.
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Instantaneous vector map and computed streamlines from PIV measurement over the rear suction surface at t/τ0=0.85.Re=1.6×105,sb/sc=1.
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Schematic showing the evolution of pressure oscillations due to the interaction of the wake and separating boundary layer




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