The effect of bulk-driven acoustic streaming on a turbulent boundary layer over a flat plate has been experimentally measured. In this fundamental study for boundary layer manipulation, the acoustic streaming flows were induced by two different types of high power ultrasonic transducers: a Langevin horn and a focussed array of parking sensor transducers, operating at 26 kHz and 40 kHz respectively. The boundary layer was characterised using CTA hot-wire anemometry, with high resolution measurements recorded in both the streamwise and spanwise directions around the transducer location. The results show that acoustic streaming flows in the order of 1.5 m/s can cause a reduction in the velocity energy content of approximately 3 dB across a wide frequency range between 10 Hz and 8 kHz.
Original languageEnglish
Publication statusSubmitted - 2023


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