圆柱绕流噪声预报的流场与声场模拟方法对比研究  

Comparative Study on the Flow Field and Acoustic Field Simulation for Noise Prediction Induced by the Flow around a Cylinder

作　　者：张翰钦[1] 陈明[1] 孙国仓[1] 

机构地区：[1]武汉第二船舶设计研究所,武汉430205

出　　处：《噪声与振动控制》2016年第3期26-31,共6页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51409199)

摘　　要：以三维圆柱为研究对象,使用Lighthill声类比法研究其绕流发声问题。第一步进行流场计算,分别用大涡模拟(LES)、脱体涡模拟(DES)和瞬态雷诺平均法(URANS)模拟声源区流场,通过对比流场压力和涡量等参数,据此选取合适的流场仿真方法;第二步用基于Lighthill方程FW-H积分法和边界元法预报远场直发声,通过和Revell试验结果比较,分析各种计算方法差别。研究表明:进行流场仿真时LES计算结果最好,IDDES法在保证计算精度条件下能有效减少流场网格数量,URANS法误差很大;进行辐射噪声预报时,FW-H积分法和边界元法基本相同。Lighthill acoustic analogy method is used to predict the noise induced by the flow around a three dimensionalcylinder. Firstly, the flow field of sound source area is predicted by large-eddy simulation （LES）, detached-eddy simulation（DES） and Transient Reynolds- average method （TRAM） respectively. The proper methods to simulate the flow field areselected via comparing the contours of vorticity and pressure. Secondly, the FW-H integral equation method and BEM methodbased on Lighthill acoustic analogy equation are used to predict the far-field noise, difference of these methods is analyzed bycomparing their results with Revell’s experimental data. It is shown that the flow field simulation result of LES has a bestagreement with the experimental data, IDDES method can effectively reduce the number of grid of the flow field with theprecision guaranteed. TRAM can yield large errors. FW-H integral equation method and BEM method can essentially yield thesame results in predicting radiation noise.

关 键 词：声学 流噪声 大涡模拟 脱体涡模拟 Lighthill声类比 

分 类 号：O422.6[理学—声学]