Experimental analysis of aeroacoustic instabilities in Helmholtz resonators

© Proceedings of ISMA 2018 - International Conference on Noise and Vibration Engineering and USD 2018 - International Conference on Uncertainty in Structural Dynamics. All rights reserved. This paper presents an experimental study of the aeroacoustic characteristics of Helmholtz resonators. The two-port characterization technique is applied to compute the scattering properties of the resonators from measured pressure spectra. The onset of aeroacoustic instabilities is investigated using an acoustic power balance based on the linear scattering matrix formulation. The influence of the grazing flow velocity on the aeroacoustic instability onset is discussed. Additionally, the effect of the orifice dimensions is analyzed with two different configurations. The results offer a valuable database for the validation of computational techniques for the prediction of whistling onset in duct systems.

ISBN:9789073802995

Jaar van publicatie:2018

BOF-keylabel:ja

IOF-keylabel:ja

Authors from:Government, Higher Education

Toegankelijkheid:Open