Results of experimental study of the acoustic waves generated by supersonic submerged air jet are presented. The sound pressure was measured within the frequency region between 20 Hz and 100 kHz by a set of 5 microphones mounted on the jet unit of Т-326 wind tunnel at ITAM SB RAS. It is shown, that the level of generated acoustic modes is within 150–157 dB, the character of modes changes from harmonic to noise-like with the increase in the ratio of nozzle exit pressure to the atmospheric pressure. The source of the sound is on the jet axis near to the area of transition to the jet subsonic velocity.
supersonic jet, acoustic wave, phase, spectral and correlation functions