Abstract: The nonlinear acoustics solver (NLAS) approach is adopted to study the aerodynamic noise in the near field of the CRH3 high speed train. The method validation is conducted through a two-dimensional backward step case, which shows excellent agreement with experimental results. With the help of acoustic surface around the noise sources, far field aerodynamic noise study is carried out by solving the Ffowcs-Williams/Hawking (FW-H) equation. The aerodynamic noise study on CRH3 high speed trains with a speed of 300 km/h is performed. The feature of the flow field dominates the generation of aerodynamic noise, therefore the flow field obtained by the RANS solution is firstly analyzed, with the head, the rear, and the inter-coach spacing included. By using of probes placed in specific regions on the surface of the train, the contribution of different parts of the train for aerodynamic noise is discussed. Meanwhile, the far field feature of aerodynamic noise is also studied by placing probes in the far field.

Key words: aerodynamic noise, NLAS, FW-H equation, acoustic surface

摘要： 采用非线性声学求解方法(NLAS)进行近场气动噪声研究, 通过一个二维后台阶算例进行了方法验证, 与实验数据符合良好。在噪声源周围建立噪声面, 并利用FW-H方程进行远场噪声评估。对CRH3型高速列车在300 km/h速度下运行进行了气动噪声分析, 着重考虑车体几何对气动噪声的影响。首先对高速列车在RANS计算下的统计结果进行分析, 研究高速列车关键部位如头部、车厢连接处、尾部等的流场特征。进而通过在列车表面特征位置设置测点, 研究车体不同部位对气动噪声产生的贡献。通过在远场设置噪声测点, 分析了CRH3型高速列车的远场气动噪声特性, 并对噪声水平进行了评估。

关键词: 气动噪声, NLAS, FW-H方程, 噪声面