Measurements on a little known sound source - the Vortex Whistle
Abstract
Acoustic measurements on a vortex whistle corroborates earlier findings that the frequency increases linearly with the velocity of the air flowing into the whistle. Measurements in a reverberant chamber shows that the acoustic power generated by the whistle increases close to the sixth power of the frequency. PIV and hot-wire measurements give quantitative information on the flow. It is shown that the flow exits the pipe as a swirling annulus with a rotation corresponding to the frequency of the sound, and that the center of the swirl follows a nearly circular path in the exit plane. The PIV measurements also indicate a toroidal vortex with inflow along the center line close to the exit of the whistle.
Cite
@article{arxiv.1604.02251,
title = {Measurements on a little known sound source - the Vortex Whistle},
author = {Ulf Kristiansen and Muriel Amielh},
journal= {arXiv preprint arXiv:1604.02251},
year = {2016}
}
Comments
13 pages, 13 figures, 3 tables; part of the Proceedings of the 39th Scandinavian Symposium on Physical Acoustics (arXiv:1604.01763)