高速列车气动噪声数值仿真

建立了高速列车组包括头车、中间车、尾车及外部空间在内的气动噪声计算物理模型,从声学理论出发,结合列车实际运行的边界条件,运用以稳态结果作为初始值进行瞬态计算,预测了高速列车气动噪声,并对采用直接瞬态法计算气动噪声的可行性进行了分析计算.研究结果表明气动噪声分布于很宽的频带内,无明显的主频,属于宽频噪声.在低频中气动噪声...

Research on Numerical Simulation of Aerodynamic Noise for High-Speed Train

A three-dimension computational fluid dynamics model with a head nose-coach,a middle coach and a tail nose-coach is constructed,and the boundary condition is exerted according to the practical case.The transient fluid dynamic computations are performed using the steady results as a original values,the near-field aerodynamic noises are achieved,and the feasibility of using the direct transient method is analyzed by performing a direct transient computation.The results show that the aerodynamic noise is a broadband noise in a wide frequency range without a main frequency.The noise energy is higher in low frequency and lower in high frequency.The method using the steady results as a initial value can exactly forecast the aerodynamic noise, while the results computed by the direct transient method have not a correct tendency,and can not be used to evaluate the aerodynamic noise characteristics.