Turbomachinery Wakes: Differential Work and Mixing Losses

[+] Author and Article Information
M. G. Rose, N. W. Harvey

Turbine Systems, Rolls-Royce plc, Derby, United Kingdom

J. Turbomach 122(1), 68-77 (Feb 01, 1999) (10 pages) doi:10.1115/1.555429 History: Received February 01, 1999
Copyright © 2000 by ASME
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Simple wake mixing model with acceleration before mixing 2
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Effect of acceleration on mixing loss
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Simple differential work extraction model
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Classical turbomachinery velocity triangles for free stream and wake
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Variation of differential work coefficient μ as wake total temperature and total pressure are varied for an HP turbine example
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Absolute total temperature rotor inlet and exit
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Absolute total pressure rotor inlet and exit
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NGV midheight exit entropy distribution from UNSTREST
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Midheight entropy at rotor exit instantaneous picture from UNSTREST solution
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Lost turbine efficiency due to NGV wake mixing loss predicted from simple model
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Percentage change in entropy rise due to mixing with and without rotor work
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Velocity triangles for compressor case wake and free stream
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Variation of μ as the total pressure of the stator wakes is varied
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Change in the stator wake mixing loss due to differential work extraction for a multistage compressor stage
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One-dimensional compressible wake mixing sum
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Two-dimensional compressible wake mixing sum




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