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高速铁路长隧道压缩波波前变形规律分析
Deformation law of compression wavefront in long tunnel of high-speed railway
投稿时间:2018-02-21  修订日期:2018-04-18
DOI:
中文关键词:  高速列车  隧道  压缩波  变形  数值计算
英文关键词:High-speed train  tunnel  compression wave  distortion  numerical calculation
基金项目:
作者单位E-mail
刘金通 西南交通大学机械工程学院 liujintong@my.swjtu.edu.cn 
李人宪 西南交通大学机械工程学院 rxli@swjtu.edu.cn 
摘要点击次数: 108
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中文摘要:
      高速列车进入隧道时产生的压缩波在长隧道中传播时会产生波前变形,即波前压力梯度发生变化。线路测量和日本学者的研究表明,隧道出口处微气压波的强度与压缩波波前压力梯度最大值成正比,而微气压波的大小又与隧道出口的爆破音直接相关,因此有必要研究压缩波在长隧道中传播时的波前变形规律。本文采用计算流体力学三维动态仿真计算的方法,对长隧道内压缩波的生成和传播过程进行研究。证明了压缩波的波前变形不仅与初始压缩波生成时的惯性运动和气体摩擦相关,而且与列车在隧道中的运动相关,即列车运动产生的能量输入会影响压缩波波前的变形。通过多工况计算,获得了隧道内压力梯度的最大值及其出现位置与列车速度和隧道阻塞比之间的变化规律。
英文摘要:
      A compression wave will be generated when a high-speed train suddenly enters into a tunnel. The wavefront of the compression wave deforms as propagating in a long railway tunnel, which means the pressure gradient of the wavefront various along the tunnel. On the other hand, the intensity of micro-pressure wave at the tunnel exit is proportional to the maximum pressure gradient of the compression wave, and the sonic boom at the tunnel exit is directly related to the intensity of the micro-pressure wave. So it is necessary to study the law of the compression wave deformation in long tunnel. In this paper, the generation and propagation process of the compression wave generated by a high-speed train suddenly entering into a tunnel are investigated by using three dimensional CFD method. It is proved that the deformation of the wavefront is not only related to friction between air and walls of tunnel and the inertial motion of the compression wave, but also related to the motion of the train. That is to say the train movement in the tunnel will input energy to the back of the compression wave and hence affect the deformation of the compression wavefront. Through the calculation of multi conditions, the variation law of the maximum pressure gradient and its appearance position relating to train speeds and to tunnel blockage ratios in long railway tunnel are obtained.
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