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-  2018 

横风下普速客车与动车组在挡风墙后交会气动性能
Aerodynamic performances of common passenger train and EMU passing by each other under crosswind and wind-break wall

Keywords: 普速客车,动车组,交会,横风,挡风墙,气动性能
common passenger train
, EMU, train-crossing, crosswind, wind-break wall, aerodynamic performances

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Abstract:

基于三维、非定常、不可压缩N-S方程和k-ε双方程湍流模型,采用滑移网格技术,对横风作用下普速客车与动车组在挡风墙后交会气动性能进行数值模拟,并研究4种挡风墙高度对交会列车气动性能的影响。研究结果表明:数值模拟的列车表面瞬变压力与实车试验结果规律一致,交会压力波峰值的相对误差在10%以内;普速客车和动车组在横风下交会时,横风使得列车头部和尾部最大正压区和负压区域均发生了横向偏移;动车组与普速客车所受横向力和倾覆力矩均随着车速的增加而增加,当普速客车车速由100 km/h增至160 km/h时,普速客车和动车组倾覆力矩峰值分别增加了11.7%和20.8%,动车组受交会车速的影响更大。设置3.5 m高的挡风墙时,列车受到的横向力在4种挡风墙高度中整体上最小,与无挡风墙时相比,普速客车机车和动车组头车受到的横向力峰值分别下降了85.7%和45.4%,列车气动性能明显改善。
On the basis of the three-dimensional unsteady incompressible N-S equation and the turbulence model of k-ε two equations, the sliding mesh method was adopted, and the aerodynamic performances of EMU passing by common passenger train under crosswind and wind-break walls were simulated. The results show that by contrasting the transient pressure on the train surface with numerical simulation is consistent with the results of full-scale experiment, the peak values of pressure wave shows agreeable accordance with the error under 10%. When trains passing by each other under crosswind, the crosswind makes the pressure zone of train had lateral movement. The lateral force and overturning moment increase with the increase of train speed, and when the speed of common passenger train increase from 100 km/h to 160 km/h, the peak values of overturning moment of common passenger train and EMU increase by 11.7% and 20.8%. When 3.5 m wind-break walls are set in line side, the lateral force of trains almost approach the minimum value in the four heights, and the lateral force acting on head car of common passenger train and EMU decrease by 85.7% and 45.4% compared with no wind-break wall, which means the aerodynamic performances of the two trains are obviously improved

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