Change of the sign of the effect with increase in the intensity of high-frequency acoustic excitation of a turbulent jet

Results of an experimental investigation of high‐frequency acoustic excitation of turbulent jets for different intensities of the acoustic field are presented. It is shown that upon reaching a certain limiting level of excitation at high frequencies, the sign of the effect changes, i.e., at this level, high‐frequency excitation leads to generation of turbulence in the jet rather than its suppression. Hence it follows that the high‐frequency acoustic effect that suppresses turbulence is most efficient within an optimum range of frequencies and at an optimum level of excitation.