Influence of the turbulent boundary layer pressure fluctuation on the sound intensity measurement in a mean flow

On measuring the sound intensity in a flow the influence of turbulent boundary layer(TBL) pressure fluctuation is a subject of practical concern.In this paper,the model of the sound intensity caused by the TBL pressure fluctuation is described firstly.Based upon the developed model,the sound intensity caused by the TBL pressure fluctuation is calculated using the available models of the wave-vector frequency spectra of the TBL pressure fluctuation.In order to validate the model and the numerical results,a series of measurements was carried out.It is shown that the calculated results of the TBL pressure fluctuation agree fairly well with the measured results which are corrected with the estimated spatial response function of the microphone.Also,the characteristics of the measured sound intensity are consistent with that of the calculated sound intensity.