Effect of Specific Heat Ratio, Impeller Tip Running Clearance, and Compressor Insulation on High-Pressure-Ratio Centrifugal Compressor Modeling

[+] Author and Article Information
J. A. Block

Multiphase Flow Division, Creare Inc., Hanover, N. H.

P. W. Runstadler

Creare Inc., Hanover, N. H.

J. Fluids Eng 97(2), 174-179 (Jun 01, 1975) (6 pages) doi:10.1115/1.3447249 History: Received January 17, 1975; Online October 12, 2010


Results are displayed which show the effect of gas specific heat ratio, impeller tip running clearance, and compressor insulation on modeling of a high-pressure-ratio compressor’s performance. The data were obtained using a low-speed-of-sound gas and a compressor previously tested extensively in air. Duplication of the air inlet specific heat ratio was found to be essential to modeling the air-equivalent flow rate accurately. Stage pressure ratio and stage efficiency were found to be less sensitive to the accurate replication of the air specific heat ratio. For the compressor tested, stage isentropic efficiency increased as impeller-to-shroud tip running clearance was reduced from 15 to 5 percent of the impeller tip axial depth. The measured stage efficiency was found to depend strongly on the heat transfer between the compressor and surroundings.

Copyright © 1975 by ASME
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