Pressure Surface Separations in Low-Pressure Turbines—Part 1: Midspan Behavior

[+] Author and Article Information
Michael J. Brear, Howard P. Hodson

Whittle Laboratory, Cambridge University, Cambridge, UK

Neil W. Harvey

Rolls-Royce, plc, Derby, UKe-mail: neil.harvey@rolls-royce.com

J. Turbomach 124(3), 393-401 (Jul 10, 2002) (9 pages) doi:10.1115/1.1450764 History: Received October 20, 2000; Online July 10, 2002
Copyright © 2002 by ASME
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Blade A and the angles of incidence studied
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(a) Wake at 125 percent Cx, and (b) pressure surface stagnation pressure loss traverses at 95 percent Cx (Re2=130,000, steady inflow)
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Pressure surface stagnation pressure loss variation with Re2 (no wake passing, SI=steady inflow, G=grid,M=model)
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Predicted contours of isentropic velocity around the leading edge
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Isentropic velocities from numerical prediction and experiment (a) under steady inflow (Re2=130,000), and (b) at 0 deg incidence (Re2=130,000)
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Smoke wire visualization at i=−10 deg (Re2=130,000, steady inflow)
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Contours of uRMS/V2 along the pressure surface (contour level=0.01V2,Re2=130,000, steady inflow)
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Profiles of (a) ū/V2 and (b) uRMS/V2 throughout the pressure surface separation (i=0 deg,Re2=130,000, no grid)
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Maximum uRMS along the pressure surface for (a) steady inflow (Re2=130,000, steady inflow), and (b) i=+10 deg (Re2=130,000, no wake passing)
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Time traces of (uRAW−ū)/V2 along the center of the separated shear layer for (a) i=+10 deg (Re2=130,000, steady inflow), and (b) i=0 deg,f̄=0.29 (Re2=130,000, wake passing)
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Acceleration parameter along the pressure surface for i=0 deg (Re2=130,000, steady inflow)
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uRMS/V from reattachment to 95 percent Cx (i=0 deg,Re2=130,000, steady inflow)
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The model of the pressure surface separation
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Turbulent shear stress coefficient versus aspect ratio of the pressure surface separation (no wake passing)
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(a) Modeled dissipation rate, and (b) cube of isentropic velocity along the pressure surface (Re2=130,000, steady inflow)




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