高速列车过隧道对弓网动力学影响分析

Influence of high-speed trains passing through tunnel on pantograph-catenary dynamic behaviors

为研究高速列车通过隧道时产生的受电弓空气动力学效应对弓网动力学性能的影响,分别建立了受电弓/高速列车空气动力学仿真模型和弓网耦合系统动力学模型。采用滑移网格技术实现了高速列车运动,通过有限体积法求解三维瞬态可压缩Navier-Stokes方程和k-ε两方程湍流模型,计算了列车速度为350 km/h通过隧道时受电弓的气动抬升力,对考虑和未考虑列车通过隧道产生的受电弓气动抬升力作用时的弓网动力学响应进行了对比分析。计算结果表明,受电弓气动抬升力在隧道入口和出口时出现峰值,隧道内的气动抬升力较明线上大;通过隧道时产生的受电弓气抬升力变化对弓网接触压力和接触线抬升位移具有显著影响,导致受流质量变差。

In order to study the influence of pantograph aerodynamic effect on pantograph-catenary dynamic behaviors as a high speed train passing through the tunnel, an aerodynamic model of pantograph / high-spead train as well as a coupling dynamic model of the pantograph-catenary system were built. The simulation of relative motion of train was implemented by use of the sliding mesh technology, and the finite element volume method was used to solve the threedimensional, compressible, unsteady N-S equation and the turbulence model of k-~ two equation. The aerodynamic uplift force of pantograph as the high-speed trains passing through the tunnel with a speed of 350 km/h was obtained. Besides, the response of the pantograph-catenary system considering the aerodynamic uplift force or not were analyzed respectively. The results show that the aerodynamic uplift force of pantograph reaches its peak values at the entrance and exit of the tunnel, and while the high speed train running inside the tunnel is higher than that on the open line. The change of the aerodynamic uplift force of pantograph has a great effect on the contact force and the lifted displacement, which leads the quality of current collection to get worse.