Abstract

Extensive experimental and computational work was performed to characterize the edge tone phenomenon. The dependence of the oscillating frequency on some of the main parameters of the configuration including the nozzle‐wedge distance and the profile and the mean velocity of the jet was measured. The frequency was obtained from the FFT of a pressure sensor signal. The measured and computed frequencies are compared and show a very good agreement. For both the CFD simulations and the experiments the phase of the oscillation and the pressure at specified points on the wedge are correlated. For the experiments the phase of the flow oscillation is determined with the help of flow visualization pictures obtained by a high speed digital camera. From the CFD results spatial distribution of acoustical sources are also observed and correlated with pressure distribution on the wedge and with the phase of the oscillating flow. Some aspects of the initial transients are also presented.

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