Application of a Low-Solidity Cascade Diffuser to Transonic Centrifugal Compressor

[+] Author and Article Information
H. Hayami

Institute of Advanced Material Study, Kyushu University 86, Kasuga 816, Japan

Y. Senoo

Miura Company, Ltd., Matsuyama 799-26, Japan

K. Utsunomiya

Mitsubishi Kasei Corp., Yokohama 227, Japan

J. Turbomach 112(1), 25-29 (Jan 01, 1990) (5 pages) doi:10.1115/1.2927416 History: Received January 13, 1989; Online June 09, 2008


Low-solidity circular cascades, conformally transformed from high-stagger linear cascades of double-circular-arc vanes with solidity 0.69, were used as a part of the diffuser system of a transonic centrifugal compressor. Performance test results were compared with data of the same compressor with a vaneless diffuser. Good compressor performance and a wider flow range as well as a higher pressure ratio and a higher efficiency, superior to those with a vaneless diffuser, where the flow range was limited by choke of the impeller, were demonstrated. The test circular cascade diffusers demonstrated a good pressure recovery over a wide range of flow angles, even when the inflow Mach number to the cascade was over unity.

Copyright © 1990 by The American Society of Mechanical Engineers
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