提出了一种求解非紧凑低马赫数运动边界散射流动诱发噪声的预测方法。该方法首先基于运动坐标系下的连续性方程和动量方程推导得到该坐标系下的波动方程及其积分解,然后在该坐标系下采用边界元方法求解得到非紧凑运动边界表面的声压,最后将求解得到的壁面声压回代到静止或运动坐标系下的积分方程中实现对远场噪声的预测。推导得到的积分方程适用于流体与飞机机身、高速列车车身及旋转叶片等非紧凑结构边界作用诱发噪声的预测。
A method is proposed to predict the flow noise scattered by the non-compact moving body.Firstly,the wave equation and its integral solution for the moving coordinates system are derived.Then,the acoustic pressure on the non-compact boundary can be obtained by boundary element method.Finally,the far-field noise can be predicted by substituting the acoustic pressure of the wall into the integral equation in the stationary or moving coordinates system.The derived integral equation can be applied to predict the noise generated by the flow around the non-compact bodies like aircraft fuselage,high-speed train and rotating blades.
参考文献
| [1] | Wang M;Freund JB;Lele SK .Computational prediction of flow-generated sound[J].Annual Review of Fluid Mechanics,2006(0):483-512. |
| [2] | S. F. Wu;Z. Zhou .Simulation of vehicle pass-by noise radiation[J].Journal of vibration and acoustics: Transactions of the ASME,1999(2):197-203. |
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