Prediction of noise generated by low speed,separated,unsteady flow over an airfoil

摘要

The acoustic field generated by low speed,separated,unsteady,turbulent flow over an airfoil at Reynolds number 1x10~6 and Mach number 0.2 is investigated numerically using ocmputatinal aeroacoustics.A recently proposed acoustic /viscous splitting technique for the ocmputationa of acoustic disturbances caused by low speed flow is used.The acoustic solution showed waves coming of the airfoil.HTe Doppler effect was prperly captured,and hte acoustic opressure amplitude fell off according to two dimensional propagation theory.