TECHNICAL PAPERS: Gas Turbines: Heat Transfer and Turbomachinery

Direct-Transfer Preswirl System: A One-Dimensional Modular Characterization of the Flow

[+] Author and Article Information
M. Dittmann, K. Dullenkopf, S. Wittig

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

J. Eng. Gas Turbines Power 127(2), 383-388 (Apr 15, 2005) (6 pages) doi:10.1115/1.1787514 History: Received October 01, 2002; Revised March 01, 2003; Online April 15, 2005
Copyright © 2005 by ASME
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Setup of the preswirl rig
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Velocities in the absolute and relative frame of reference
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Discharge coefficients cDN for the preswirl nozzles
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Effective velocity ratio of the preswirl system
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Discharge coefficients cDR for receiver hole and a rotating orifice
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Effect of NR,1/d for NN=12,s1=10 mm,r/d=0.2
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Effect of r/d for NN=11,s1=10 mm,NR=4
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Effect of s1 for NN=12,NR=24,r/d=0.2
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Effect of ṁrad for NN=12,s1=10 mm,NR=4,r/d=0.0
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Cooling air total temperature in the relative frame of reference




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