城际列车越站瞬变压力数值仿真研究

Numerical simulation research of transient pressure of inter-city train through station

采用三维非定常、黏性、可压缩N-S方程和RNGk-ε双方程湍流模型,基于滑移网格技术,对8节编组的城际列车以160km/h速度通过地下越行车站的空气动力学性能进行模拟,分析列车速度和流线型长度对其瞬变压力的影响。研究结果表明:数值计算得到的车体和隧道表面测点的压力变化曲线与动模型试验的结果吻合较好。车站内部结构多变不对称,列车表面左右对称测点压差不明显,屏蔽门与其对面车站内壁对称测点的压差主要发生在头车通过时,屏蔽门上压力幅值比对面车站内壁大54.32%;屏蔽门表面压力变化幅值沿高度和纵向逐渐减小;流线型长度由1.5 m增加到5.5 m时,列车表面压力最大减小了10.52%,屏蔽门入口段压力变化幅值最大减小了14.06%。

Based on the sliding meshing technologies,three-dimensional unsteady viscous compressible N-S equation and a RNG k-εequation turbulence model were used to simulate the aerodynamic performance of 8 cars inter-city train through a typical underground overtaking station at 160 km/h,and analyze the influence of train speed and streamline length on the transient pressure.The computational results show follows:The pressure curve of numerical simulation is consistent with the law of dynamic model test,and both are in good agreement.Station internal structure is changeful and asymmetrical,symmetric point pressure difference of train surface is not obvious,platform screen door and the opposite wall symmetry points of pressure difference mainly occurs in the head coach through,and the pressure variation amplitude of the platform screen door is greater than the opposite wall 54.32%.Platform screen door surface pressure variation amplitude along the height and the longitudinal decreases.When the streamline length is increased from 1.5 m to 5.5 m,the surface pressure variation amplitude of the train is maximum decreased by 10.52%,and the pressure variation amplitude of the platform screen door entrance is maximum decreased by 14.06%.