Based on the Lighthill's acoustic equation, the boundary element method (BEM) combined with the computational fluid dynamics (CFD) was utilized to achieve the distribution of aerodynamic dipole source on high-speed train surface. The strength and distribution of the aerodynamic dipole source under different train speeds were investigated, and train's external aerodynamic acoustic field based on the aerodynamic dipole source was analyzed by a numerical simulation. The research results show that when a train runs at 270 km/h and the frequency is 2. 5 kHz, main aerodynamics noise source with a sound pressure level over 90 dB is located near its bogies, and the maximal sound pressure level is approximately 97 dB.%以Lighthill方程为基础,采用边界元法并与计算流体动力学相结合,对高速列车表面气动噪声偶极子声源进行数值分析,以获得高速列车表面气动噪声偶极子声源分布.探讨了不同车速工况下列车车身表面气动偶极子声源的强弱及其分布特征,在此基础上对基于表面气动偶极子声源的列车外部气动声场进行了数值分析.研究表明:列车运行速度为270 km/h、频率为2.5 kHz时,声压级在90 dB以上的气动偶极子声源主要分布在车底转向架附近,其最大声源声压级约97 dB,是高速列车主要的气动噪声源区.
展开▼
