Numerical simulation of the effect of geometric parameters on broadband noise of aeroengine fan/compressor

Abstract For modern advanced turbofan engines, the increasing broadband noise of the fan/compressor has become an urgent problem. Based on the 3D fan sound source model, the numerical simulation of the effect of geometric parameters on broadband noise prediction is studied. As a result, (1) the three parameters change the sound power level by affecting the kernel function or the upwash velocity spectrum, and the influence laws are different. (2) If the kernel function is affected, the shape and size of the sound power level spectrum will change; if the upwash velocity spectrum is affected, only the sound power level is changed and the spectrum shape is basically unchanged. (3) The number of rotors only affects the upwash velocity spectrum; the number of stators and the chord length of stators only affect the kernel function.