Discharge Coefficients of a Preswirl System in Secondary Air Systems

[+] Author and Article Information
M. Dittmann, T. Geis, V. Schramm, S. Kim, S. Wittig

Lehrstuhl und Institut für Thermische Strömungsmaschinen, University of Karlsruhe, 76128 Karlsruhe, Germany

J. Turbomach 124(1), 119-124 (Feb 01, 2001) (6 pages) doi:10.1115/1.1413474 History: Received February 01, 2001
Copyright © 2002 by ASME
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Details of test section; dimensions in mm
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Instrumentation of preswirl rig
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Velocities in absolute and relative frames of reference
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Discharge coefficients for preswirl nozzles cDN
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cDR,abs without preswirl plate
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Typical trends for cDN,cDR, and cD
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Effect of NR,l/d, and NN
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Effect of r/d for NN=11,NR=4, and s1=10 mm
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Effect of s1 for NN=12,NR=24, and r/d=0.2
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Effect of a superposed radial outflow




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