Validation of a Quadrupol Model of Sound Radiation of a Turbulent Jet Based on Multi-Microphone Acoustic Measurements

A low-order model of quadrupole sound sources in a turbulent jet has been developed using the acoustic analogy method. Multi-microphone acoustic measurements of jet sound radiation are used to estimate the model parameters and validate it. Based on measurements carried out in different zones of the sound field, estimates of the size of the effective localization region of sound sources are made and the boundaries of the zone of dominance of quadrupole sound radiation over pseudosonic pulsations are determined. The proposed model can be used in practical estimates of the spectral and correlation characteristics of the far and near sound field of the jet.