首页|Influence of ground effect on flow field structure and aerodynamic noise of high-speed trains
Influence of ground effect on flow field structure and aerodynamic noise of high-speed trains
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The simulation of the ground effect has always been a technical difficulty in wind tunnel tests of high-speed trains.In this paper,large eddy simulation and the curl acoustic integral equation were used to simulate the flow-acoustic field results of high-speed trains under four ground simulation systems(GSSs):"moving ground+rotating wheel","stationary ground+rotating wheel","moving ground+stationary wheel",and"stationary ground+stationary wheel".By comparing the fluid-acoustic field results of the four GSSs,the influence laws of different GSSs on the flow field structure,aero-acoustic source,and far-field radiation noise characteristics were investigated,providing guidance for the acoustic wind tunnel testing of high-speed trains.The calculation results of the aerodynamic noise of a 350 km/h high-speed train show that the moving ground and rotating wheel affect mainly the aero-acoustic performance under the train bottom.The influence of the rotating wheel on the equivalent sound source power of the whole vehicle was not more than 5%,but that of the moving ground slip was more than 15%.The average influence of the rotating wheel on the sound pressure level radiated by the whole vehicle was 0.3 dBA,while that of the moving ground was 1.8 dBA.
High-speed trainAero-acousticsFlow field structureLarge eddy simulationMoving ground conditionRotating wheel
Xiaoming TAN、Linli GONG、Xiaohong ZHANG、Zhigang YANG
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Key Laboratory of Intelligent Manufacturing and Service Performance Optimization of Laser and Grinding in Mechanical Industry,Hunan Institute of Science and Technology,Yueyang 414000,China
Key Laboratory of Traffic Safety on Track(Central South University),Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China
National Natural science Foundation of ChinaFoundation of the Key Laboratory of Aerodynamic Noise Control China
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