列车通过引起轨侧脉动压力波的数值模拟

Numerical Simulation of Train-induced Aerodynamic Impulse Pressure Waves beside the Track

基于计算流体力学和滑移网格技术,数值模拟了列车通过引起的轨侧脉动压力波。建立列车通过轨侧脉动压力波的计算模型,通过网格独立性检验选取合适的计算网格。研究列车通过轨侧脉动压力波的特征,规律以及四种不同轨道基础形式对列车通过轨侧压力波的影响,包括平地、单线路堤、复线路堤和复线桥梁。研究结果表明:列车头部通过引起轨侧测点的压力峰峰值,比列车尾部通过引起轨测点的压力峰峰值要大;列车通过平地的压力峰峰值最大,通过复线桥梁的压力峰峰值最小;轨侧压力的峰峰值与距轨道中心线横向距离呈负指数关系,不同速度下列车通过引起的轨侧压力峰峰值系数几乎一致。

Based on computational fluid dynamics and sliding mesh technology, the train-induced aerodynamic impulse pressure waves beside the track are numerical simulated. The calculation model of impulse pressure waves beside the track is established, and the suitable calculation mesh is chosen through mesh independent tests. Characteristics of impulse pressure waves are analyzed. The effect of the impulse pressure waves on four different types of railway infrastructures is analyzed. Four types of the railway infrastructures are fiat ground, single-track embankment, double-track embankment and double-track bridge, respectively. Results show thet peak to-peak pressure value caused bythe passage of the train nose is larger than that caused by the passage of the train trail The peak-to-peak pressure value caused by a passage of the fiat ground is largest, and that caused by a passage of the double-track bridge is smallest. Finally, the changing regularity of impulse pressure waves is analyzed. The peak-to-peak pressure value at the trackside is negative exponential proportional to the lateral distance. Besides, the peak-to-peak pressure coefficient values caused by the passage of a train with different running speeds are almost consistent.