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Acoustic measurements on a vortex whistle corroborates earlier findings thatthe frequency increases linearly with the velocity of the air flowing into thewhistle. Measurements in a reverberant chamber shows that the acoustic powergenerated by the whistle increases close to the sixth power of the frequency.PIV and hot-wire measurements give quantitative information on the flow. It isshown that the flow exits the pipe as a swirling annulus with a rotationcorresponding to the frequency of the sound, and that the center of the swirlfollows a nearly circular path in the exit plane. The PIV measurements alsoindicate a toroidal vortex with inflow along the center line close to the exitof the whistle.

Measurements on a little known sound source - the Vortex Whistle