Acoustic Characteristics of an Expansion Chamber With Constant Mass Flow and Steady Temperature Gradient (Theory and Numerical Simulation)

[+] Author and Article Information
Yang-Hann Kim, Jae Woong Choi

School of Mechanical and Material Engineering, Korea Institute of Technology, 400 Kusung-dong, Yusung-gu, Taejon-shi, 302-338, Korea

Byung Duk Lim

Acoustics and Vibration Laboratory, Korea Standards Research Institute, Taejon-shi, 302-340, Korea

J. Vib. Acoust 112(4), 460-467 (Oct 01, 1990) (8 pages) doi:10.1115/1.2930129 History: Received November 01, 1989; Online June 17, 2008


The governing equation of acoustic wave propagation in a circular expansion chamber with mean flow and temperature gradient is solved. The circular chamber is divided into N segments and the flow speed and temperature are assumed to be constant in each segment. The solution is obtained in recursive form by applying the matching condition on the boundary of adjacent elements. The solution is verified by comparing it with the experimental results. The results demonstrate that the present theory can well predict the transmission loss of an expansion chamber which has offset, a twisting angle, mean flow, and temperature gradient.

Copyright © 1990 by The American Society of Mechanical Engineers
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