Sound transmission performance of the periodic Helmholtz resonator array in the presence of grazing flow

Abstract

This paper presents experimental investigations into the acoustic behavior of the Helmholtz resonator model in the presence of grazing flow. The four-microphone method is performed to measure the transmission loss performance of the resonator model under flow speeds of 0–20 m/s, and the particle image velocimetry (PIV) measurement is adopted to evaluate the fluid characteristics of the resonator neck. The flow effect on the acoustic performance of the resonator model is derived by using the curve fit technique. An empirical model is established to predict the transmission loss of the Helmholtz resonator in the presence of the grazing flow. The empirical model is added to the transfer matrix method to predict the transmission loss of the period Helmholtz resonator model under different grazing flow speeds. The PIV experiment results reveal the fluid dynamics in the neck region of the resonator model. Based on the acoustic and PIV experimental analysis, this work can provide a prediction of the acoustic performance of the periodic Helmholtz resonator array in the presence of grazing flow.