Sound Transmission and Suppression in Turbomachinery Ducts PUBLIC ACCESS

[+] Author Affiliations
M. J. Benzakein, J. W. Zwick

General Electric Co., Cincinnati, OH

Paper No. 70-GT-58, pp. V01AT01A058; 11 pages
  • ASME 1970 International Gas Turbine Conference and Products Show
  • Volume 1A: General
  • Brussels, Belgium, May 24–28, 1970
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7985-6
  • Copyright © 1970 by ASME


The authors present analysis of the transmission and radiation of turbomachinery generated noise in fans and compressor ducts. Based on a numerical solution of the three-dimensional wave equation in a homogeneous medium flowing in ducts of arbitrary shape, the analysis is an extension of the analytical treatment of noise generation in turbomachinery presented in references (1) and (2). The theoretical noise transmission model permits the evaluation of fan/compressor noise suppressor (acoustic treatment) configurations in the presence of spinning modes in a moving medium. Results of barometric calculations are presented for a stationary medium; experimental verifications of the analysis are included; and the effects of turbomachinery duct lengths and shapes on the transmission of sound are discussed. Also presented are the results of parametric studies on the effects of liner material location on sound suppression. The results indicate that optimum sound suppression can be achieved with the basic knowledge of the duct wave propagation phenomena.

Copyright © 1970 by ASME
Topics: Sound , Ducts , Turbomachinery
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