Numerical Simulation of Initial Compression Wave Characteristics in Double Track Tunnel of Medium Speed Maglev Train

Kuishan REN; Kui LI; Yao JIANG; Faxing PAN; Yuangui MEI

doi:10.13890/j.issn.1000-128x.2020.06.011

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Numerical Simulation of Initial Compression Wave Characteristics in Double Track Tunnel of Medium Speed Maglev Train

Maglev Technology Column | 更新时间：2021-12-09

- Numerical Simulation of Initial Compression Wave Characteristics in Double Track Tunnel of Medium Speed Maglev Train
- Electric Drive for Locomotives Issue 6, Pages: 51-55(2020)
- 作者机构：
  
  1.兰州交通大学　甘肃省轨道交通力学应用工程实验室，甘肃　兰州　730070
  2.中铁二院工程集团有限责任公司　科学技术研究院，四川　成都　610031
- 作者简介：
- 基金信息：
- DOI：10.13890/j.issn.1000-128x.2020.06.011
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Kuishan REN, Kui LI, Yao JIANG, et al. Numerical Simulation of Initial Compression Wave Characteristics in Double Track Tunnel of Medium Speed Maglev Train. [J]. Electric Drive for Locomotives (6):51-55(2020)
DOI：

Kuishan REN, Kui LI, Yao JIANG, et al. Numerical Simulation of Initial Compression Wave Characteristics in Double Track Tunnel of Medium Speed Maglev Train. [J]. Electric Drive for Locomotives (6):51-55(2020) DOI： 10.13890/j.issn.1000-128x.2020.06.011.

摘要

磁浮列车以一定速度驶入隧道时会产生初始压缩波，该压缩波会以当地声速向着隧道出口方向传播，并在隧道出口处向周围辐射出去形成微气压波，微气压波足够大时会产生音爆声，从而对环境造成严重的危害，而洞口微气压波与初始压缩波紧密相关。文章基于三维可压缩非定常湍流流动雷诺平均N-S方程和SST K-ω 两方程湍流流动模型，采用有限体积方法和重叠网格技术，数值模拟研究了磁浮列车进入隧道引起的空气流动和初始压缩波的问题。研究表明，在列车进入隧道过程中初始压缩波形成初期具有三维特性，在传播一定距离后脱离车体影响变成一维平面波；其次，在同一高度下，越接近车体压缩波变化越大，靠近车体一侧离地面越近压缩波变化也越大，而远离车体一侧初始压缩波变化基本一致；初始压缩波的压力梯度最大值与列车速度的3次方近似成正比。

Abstract

When the maglev train runs into the tunnel at a certain speed, it will produce the initial compression wave, which will propagate towards the tunnel exit at the local sound speed, and radiate to the surrounding at the tunnel exit to form the micro pressure wave. When the micro pressure wave is large enough, it will produce the sound explosion, which will cause serious harm to the environment, and the micro pressure wave at the entrance is closely related to the initial compression wave. Based on the three-dimensional compressible unsteady turbulent flow Reynolds averaged Navier Stokes equation and SST K - ω two equation turbulent flow model, the air flow and initial compression wave caused by maglev train entering the tunnel were numerically simulated by using the fi nite volume method and overlapping grid technique. The results showed that the initial compression wave had three-dimensional characteristics in the process of the train entering the tunnel, and after a certain distance, it became one-dimensional plane wave; secondly, at the same height, the closer to the car body, the greater the change of the compression wave, the closer to the car body and the closer to the ground, the greater the change of the compression wave, while the change of the initial compression wave far away from the car body was basically the same; The maximum pressure gradient of initial compression wave is approximately proportional to the third power of train speed.

关键词

中速磁浮列车隧道初始压缩波数值模拟

Keywords

medium-speed maglev traintunnelinitial compression wavenumerical simulation

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