The Pressure Pulsation and Spectrum Analysis of Ducted Propeller Based on SST k-ω model

Abstract

The pressure pulsation and spectrum of the four-blade ducted propeller are numerical simulated by CFD method. The flow field inside and behind the propeller is analysed by using SST k-ω Model. On the basis of the flow field, an acoustic grid is built. By setting several monitoring points in the area behind the propeller, the pressure pulsation in these points are recorded. Time domain curves of pressure pulsation in different points show a similar changing circle. After Fast Fourier Transformation (FFT), the blade passing frequency is calculated. The pulsation value near the hub is smaller than that at the tip of the blade. The fundamental frequencies of the pressure pulsations of the wake field are the same at different axial positions. The rotation of the blade has a great influence on the pressure pulsation near the blade. The pressure pulsation amplitude is larger near the propeller, and the amplitude at a far distance is smaller.