Numerical Prediction of the Hydrofoil Noise

Abstract

Abstract Using the improved Sauer cavitation model and K-FWH acoustic model proposed by Yang Qiongfang to numerically calculate the unsteady cavitation flow field of NACA0015 three-dimensional hydrofoil, the noise of the three-dimensional hydrofoil was calculated, and the cavitation process and cavitation noise of the hydrofoil were numerically predicted. The results demonstrate that the hydrofoil cavitation shows distinctive characteristics of pulsation and periodicity. The main cause of formation and detachment of cavitation bubbles is the reverse jet nearby the hydrofoil wall due to eddies. By analyzing the sound pressure pulsation characteristics of each monitoring point, it can be concluded that the noise transmission in the leading edge of the hydrofoil is consistent with the direction of the mainstream, no reverse transmission. In the development process of cavitation, the noise signals in cavitation area tend to be superimposed downstream. When the signals transmit to the flowing area at the trailing edge of the hydrofoil, they gradually attenuate until being exhausted.