ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

2aNS7. Application of describing-function theory to a flow-excited resonator.

Hyungseok Kook

Luc Mongeau

School of Mech. Eng., Purdue Univ., 1077 Herrick Lab., W. Lafayette, IN 47907

A theoretical model based on a describing-function theory [T. D. Mast and A. D. Pierce, J. Acoust. Soc. Am. 97, 163--172 (1995)] was applied to the problem of a flow-excited Helmholtz resonator with a complex geometry. The lumped acoustic parameters and flow parameters required in the model were determined both from empirical data and from existing analytical models. Detailed comparisons were made between experiments and theory in order to validate the approach. The results show that the theory provides an alternative to computationally intensive CFD models for predicting the main acoustic characteristics of the resonator system.