高速铁路隧道压力波动主要影响参数研究

利用所研制的预测列车进入隧道时引起的列车和隧道环状空间的压力波动软件,计算了流线型列车及隧道主要参数对环状空间3s内最大压力变化的影响。结果显示所有影响因素中,速度和阻塞比对压力变化的影响最大。得出单线隧道单列列车通过时,在速度不大于250km·h-1,3s内最大压力变化与列车速度的平方成正比,但速度超过250km·h-1时,压力对速度的依赖关系有所缓和。分析认为在3s内最大压力变化随阻塞比非线性地变化。研究表明列车长度对头部压力变化的影响较小,但对尾部压力变化有明显影响;隧道内会车压力波在3s内变化量随会车位置不同有明显区别,两列车在隧道长三分之一处交会最为不利。

Study on Main Parameters Effecting Pressure Transients while Train Passing Through Tunnel

When a train is passing through the tunnel at high speed, large pressure transients are generated in tunnel. The pressure transients have influence over the comfort and safety of the passenger. Accordingly, it is necessary to predict these pressure transients accurately while planning the high-speed railway. This paper studies the pressure transients generated by train traveling through tunnel with the one-dimensional, compressible, unsteady flow model. Based upon the method, a numerical procedure is developed, that can be used to predict the pressure transients when a single train travels through a tunnel and two trains meets in a tunnel. It can also be used to calculate the pressure transients in tunnels with airshafts. Train parameters, tunnel parameters and the meeting positions of two trains are key factors, which governs the pressure transients and have been studied in detail.