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以CRH2列车、京沪高铁上32 m简支梁桥为研究对象,采用商业计算流体力学软件Fluent,基于三维、定常N-S方程和Realizable k-ε湍流模型,进行侧风作用下挡风墙对车桥系统气动性能影响的数值模拟计算。通过雷诺数、挡风墙等价透风率、挡风墙高度、透风率及风偏角的改变,对车桥气动性能进行研究。计算结果表明:雷诺数对列车气动性能有一定影响。挡风墙高度的增加会使作用于桥梁上的侧力和力矩系数增大,升力系数则变化不明显。在等价透风率挡风墙下栏杆数量多的挡风墙挡风效果优于栏杆数量少的挡风墙。挡风墙高度并非越高越好,而是有一个合理的高度范围。在同一高度挡风墙下,列车气动力系数随着透风率的增大而增大。风偏角对列车气动性能影响的规律基本一致。
Taking CRH2 train and 32 m simply supported beam bridge on the Beijing-Shanghai high-speed railway as the research object, commercial computational fluid dynamics software Fluent was used to simulate the wind-wall-to-vehicle interaction based on the 3D, steady-state Navier-Stokes equations and Realizable k- Numerical Simulation Calculation of Aerodynamic Performance of Bridge System. The aerodynamic performance of the axle was studied by the Reynolds number, the equivalent ventilation rate of the wind wall, the height of the wind wall, the ventilation rate and the wind-deflection angle. The calculation results show that the Reynolds number has some influence on the aerodynamic performance of the train. The increase of wind wall height will increase the lateral force and moment coefficient acting on the bridge, while the lift coefficient will not change obviously. In the equivalent rate of ventilation under the wind fence more than a large number of wind barriers wind protection effect is better than the number of balustrades. Wind wall height is not as high as possible, but there is a reasonable height range. Under the same height wind wall, aerodynamic coefficient of train increases with the increase of ventilation rate. The influence of wind declination on aerodynamic performance of train is basically the same.