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RESEARCH PAPERS

Centrifugal Compressor Inlet Guide Vanes for Increased Surge Margin

[+] Author and Article Information
C. Rodgers

Chief Conceptual Design, Sundstrand Power Systems, San Diego, CA 92123

J. Turbomach 113(4), 696-702 (Oct 01, 1991) (7 pages) doi:10.1115/1.2929136 History: Received January 27, 1990; Online June 09, 2008

Abstract

This paper describes the results of compressor rig testing with a moderately high specific speed, high inducer Mack number, single-stage centrifugal compressor, with a vaned diffuser, and adjustable inlet guide vanes (IGVs). The results showed that the high-speed surge margin was considerably extended by the regulation of the IGVs, even though the vaned diffuser was apparently operating stalled. Simplified one-dimensional analysis of the impeller and diffuser performances indicated that at inducer tip Mach numbers approaching and exceeding unity, the high-speed surge line was triggered by inducer stall. Also, IGV regulation increased impeller stability. This permitted the diffuser to operate stalled, providing the net compression system stability remained on a negative slope.

Copyright © 1991 by The American Society of Mechanical Engineers
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