【作者】 张咏鸥； 张涛； 李天匀；

【Author】 ZHANG Yong-ou;ZHANG Tao;LI Tian-yun;School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology;

【机构】 华中科技大学；

【摘要】 当声波通过涡流场时,流体的流动会对声传播过程产生影响,从而形成涡流场的声散射现象。通过构造摄动声学理论模型,提出了一种涡流场声散射数值模拟方法并对散射场特性进行了研究。首先,采用交错网格时域有限差分法结合完美匹配层边界,给出了摄动声学理论模型的数值求解方法;随后,对气动声学中稳态涡流场的声散射问题进行了计算,对比验证了本文流体声学数值模拟方法的有效性;在此基础上,针对水介质涡流场在低马赫数下的声散射进行了模拟,在不考虑流噪声条件下,预报了不同马赫数不同位置的时域声散射特性。通过计算发现,涡流场的声散射会产生两个明显的峰值方向,同时当马赫数小于0.05时,声散射场基本呈对称性。更多还原

【Abstract】 When sound waves pass through a vortex flow, the vortex flow changes the sound propagation and produces vortex scattering. The present paper divide the acoustic perturbation equations, and gives out the numerical approach to solve the equations in order to simulate the vortex scattering. At first, the finite difference time domain method is used to solve the acoustic perturbation equaitons, and the boundary condition named the perfect matched layers is utilized. After that, a classic vortex scattering model in the computational aeroacoustic field is used to validate our method. Based on this, the vortex scattering at low Mach number in the water is simulated ignoring the flow-induced noise by the vortex itself. Computational results show that the sound scattering produces two primary peak sound pressure, and the scattering sound is near symmetry when Mach number is lower than 0.05.更多还原