An Experimental and Computational Study of the Formation of a Streamwise Shed Vortex in a Turbine Stage

[+] Author and Article Information
Graham Pullan, John Denton, Michael Dunkley

Whittle Laboratory, University of Cambridge, Cambridge, CB3 0DY United Kingdom

J. Turbomach 125(2), 291-297 (Apr 23, 2003) (7 pages) doi:10.1115/1.1545766 History: Received October 11, 2001; Online April 23, 2003
Copyright © 2003 by ASME
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Schematic of vortex filament convection through a blade row, after Hawthorne 5
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Meridional view of research turbine
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Photograph of NGV 1 (left) and NGV 2
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NGV 2 surface flow visualization
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NGV exit meridional yaw, αm, (traverse plane 2)— (a) NGV 1, (b) NGV 2
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The development of a “shed vortex” downstream of NGV 2—(a) streamwise vorticity, ωSW, (b) meridional yaw angle, αm, (c) calculated meridional yaw angle, αm
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Calculated streamwise vorticity, ωSW, downstream of stator trailing edge (plane 2a)—(a) NGV 1, (b) NGV 2
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Schematic of domain used for shear layer simulations
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The effect of initial shape, (a)–(c), and yaw angle distribution, (d) and (e), on the instability of a simulated vortex sheet-passive scalar contours
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Distribution of inlet yaw angle for shear layer simulation
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Trailing edge shapes viewed along average exit camberline—(a) NGV 1, (b) NGV 2
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Calculated pitchwise averaged meridional yaw angle, plane 2a




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