A Study of Acoustic Resonance in a Low-Speed Multistage Compressor

[+] Author and Article Information
T. R. Camp

Rolls-Royce plc, Derby, United Kingdom

J. Turbomach 121(1), 36-43 (Jan 01, 1999) (8 pages) doi:10.1115/1.2841232 History: Received February 01, 1997; Online January 29, 2008


Measurements are presented of a resonant acoustic phenomenon occurring in a low-speed multistage compressor. The results show that this phenomenon shares many characteristics with acoustic resonance as measured in high-speed compressors. These similarities include a rotating pressure field, several acoustic frequencies corresponding to different circumferential modes, step changes in frequency as the flow rate is increased, and acoustic frequencies that are independent of flow coefficient, shaft speed, and the axial length of the compression system. The paper includes measurements of the helical structure of the rotating pressure field and of the variation in amplitude of the acoustic signal over a stator exit plane.

Copyright © 1999 by The American Society of Mechanical Engineers
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