Effect of ambient wind on pressure wave generated by high-speed train entering a tunnel  

作　　者：ZHOU Xi-sai LIU Tang-hong CHEN Zheng-wei ZOU Xiang LIU Dong-run 周细赛;刘堂红;陈争卫;邹翔;刘东润

机构地区：[1]Key Laboratory of Traffic Safety on Track of Ministry of Education,Central South University,Changsha 410075,China [2]School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China

出　　处：《Journal of Central South University》2017年第6期1465-1475,共11页中南大学学报（英文版）

基　　金：Projects(U1134203,51575538)supported by the National Natural Science Foundation of China;Project(2014T001-A)supported by the Technological Research and Development Program of China Railways Corporation;Project(2015ZZTS210)supported by the Fundamental Research Funds for the Central South Universities of China

摘　　要：Using three-dimensional, unsteady N-S equations and k-ε turbulence model, the effect of ambient wind on the pressure wave generated by a high-speed train entering a tunnel was studied via numerical simulation. Pressure changes of the train surface and tunnel wall were obtained as well as the flow field around the train. Results show that when the train runs downwind, the pressure change is smaller than that generated when there is no wind. When the train runs upwind, the pressure change is larger. The pressure change is more sensitive in the upwind condition than in the downwind condition. Compared with no wind condition, when the wind velocity is 10 m/s and 30 m/s, the pressure amplitude on the train head is reduced by 2.8% and 10.5%, respectively. The wall pressure amplitude at 400 m away from the tunnel entrance is reduced by 2.4% and 13.5%, respectively. When the wind velocity is-10 m/s and-30 m/s, the pressure amplitude on the train head increases by 3.0% and 17.7%, respectively. The wall pressure amplitude at 400 m away from the tunnel entrance increases by 3.6% and 18.6%, respectively. The pressure waveform slightly changes under ambient wind due to the influence of ambient wind on the pressure wave propagation speed.Using three-dimensional, unsteady N-S equations and k-ε turbulence model, the effect of ambient wind on the pressure wave generated by a high-speed train entering a tunnel was studied via numerical simulation. Pressure changes of the train surface and tunnel wall were obtained as well as the flow field around the train. Results show that when the train runs downwind, the pressure change is smaller than that generated when there is no wind. When the train runs upwind, the pressure change is larger. The pressure change is more sensitive in the upwind condition than in the downwind condition. Compared with no wind condition, when the wind velocity is 10 m/s and 30 m/s, the pressure amplitude on the train head is reduced by 2.8% and 10.5%, respectively. The wall pressure amplitude at 400 m away from the tunnel entrance is reduced by 2.4% and 13.5%, respectively. When the wind velocity is-10 m/s and-30 m/s, the pressure amplitude on the train head increases by 3.0% and 17.7%, respectively. The wall pressure amplitude at 400 m away from the tunnel entrance increases by 3.6% and 18.6%, respectively. The pressure waveform slightly changes under ambient wind due to the influence of ambient wind on the pressure wave propagation speed.

关 键 词：HIGH-SPEED TRAIN AMBIENT WIND pressure wave TUNNEL 

分 类 号：U451.3[建筑科学—桥梁与隧道工程]