An Advanced Study on Sound Sources in Turbulent Jets

Spatio-temporal velocity correlation analysis of aerodynamic flow was conducted in a bid to elucidate acoustic regimes in turbulent jets. When flow characteristics are considered in Lagrangian and Eulerian modes, acoustic source regions are deemed as moving and fixed in space respectively, mindful of their peculiarities. Here space-time energy spectrum furnished correlation coefficient functions with which sound may be predicted within an acoustic region. It is observed that the autocorrelation function of a given time-bound spatial Fourier element may be found by expressing the Eulerian turbulent velocity field in the similitude of a Fourier series.