【摘要】 该文基于重叠网格方法,建立了移动列车的数值模型,研究了横风作用下三维车桥系统的绕流气动特性。通过与相关试验和文献对比,验证了重叠网格方法可以较好地模拟列车的运动;然后对横风作用下车桥系统的绕流流场进行分析,讨论了考虑列车运动后车桥气动力的变化。研究结果表明:由于列车风与横风的叠加以及车桥之间的气动干扰,使车桥系统横风绕流流场发生明显的改变;列车运动对前方空气的压缩作用使头车所受气动力最大,同时桥梁气动力也会发生突变。更多还原

【Abstract】 Based on the overset mesh method, a numerical model of moving train is established to investigate the aerodynamic performance around train-bridge system subjected to cross wind. The applicability of the overset mesh for simulating the moving train is verified by comparing with the related experiment and paper. The flow around train-bridge system under cross wind is analyzed, and the aerodynamic force acting on the train and bridge is discussed. The results show that there is a distinct change of the flow around train-bridge system due to the superposition effect between the train-induced wind and cross wind and the aerodynamic interference between train and bridge. The compressible effect of moving train on the air causes the maximum aerodynamic force on the head car, and a sudden change in the aerodynamic force acting on the bridge.更多还原