关键词: 声学, 流噪声, 大涡模拟, 脱体涡模拟, Lighthill声类比

Abstract:

Lighthill acoustic analogy method is used to predict the sound generated by flow past a three dimensional cylinder. Firstly, the flow field of sound source is predicted by large-eddy simulation, Detached-Eddy Simulation and Unsteady Reynolds-Average Method respectively, methods to simulate the flow field are selected via contrasting the contours of vorticity and pressure. Secondly, FW-H integral equation method and BEM method based on Lighthill acoustic analogy equation are used to predict noise at far field, difference among these methods is researched by comparing with Revell’s experiment data. Researches show that the flow field simulation result of LES has a greatest agreement with experiment, IDDES has a better compromise with the precision and number of grid, URANS is the worst prediction method. FW-H integral equation method is same as BEM method in predicting radiation noise.