2016/04/08 by Ulf R. Kristiansen, Kristiansen, Ulf, Muriel Amielh +1
Engineering · #Aerodynamics and Acoustics in Jet Flows #Classical Physics (physics.class-ph) #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Fluid Dynamics and Turbulent Flows #Fluid Dynamics and Vibration Analysis #Instrumentation and Detectors (physics.ins-det)
paper · pdf · doi:10.48550/arxiv.1604.02251
openalex publication_date 2016/04/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.