Unsteady Transport Mechanisms in an Axial Turbine

[+] Author and Article Information
Claudia Casciaro, Martin Treiber, Michael Sell

Turbomachinery Laboratory, Institute of Energy Technology, Swiss Federal Institute of Technology, 8092 Zurich, Switzerland

J. Turbomach 122(4), 604-612 (Feb 01, 2000) (9 pages) doi:10.1115/1.1290398 History: Received February 01, 2000
Copyright © 2000 by ASME
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Negative jet in relative frame of reference
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Error made by considering average velocity instead of undisturbed velocity
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Configurations and block topologies
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Details of pin (a) and leading edge (b) grids or two-dimensional computations (from topology in Fig. 3). Outlet grid (c) for three-dimensional cases (same topology). Figures not to same scale.
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Axial velocity: comparison of computed and theoretical values, expected with Dullenkopf’s model, for PIN1
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Negative jet at midspan for PIN2
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Schematics of negative jet feeding mechanisms
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Absolute vectors near leading edge over one period for PIN2
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Static pressure coefficient versus nondimensionalized time at midspan (three periods are represented)
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Absolute total pressure contours for PIN1 (above) and PIN2 (below)
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Absolute total pressure coefficient at midspan 1/6th axial chord downstream of trailing edge
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Total temperature for PIN1 at midspan at 23/30T
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Quiescent zones (as isosurfaces for 1 percent of averaged unsteady velocity field) near wall on suction side at 12/30T and pressure side 29/20T for PIN1. In the top picture a cut at 1/4 can also be seen, with unsteady velocity field, showing incoming wake shape.
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Time-averaged absolute total pressure coefficient at 1/6th axial chord downstream of trailing edge (top) and static pressure coefficient on suction side (bottom) for PIN1 (a) and steady-state computation (b)




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