Location of acoustic sources placed under a boundary layer - Effect of the pressure field

Experimental results on the superconvection of sound waves in transitional and turbulent boundary layers have been obtained, and a propagation model to account for pressure fluctuations is developed. The results reveal a downstream shift of the source position which is strongly correlated with pressure fluctuations of the transitional-turbulent boundary layer. The results do not provide evidence for reciprocal coupling between the acoustic wave and the flow. Good agreement is found between theoretical and experimental results.