高速列车隧道内交会压力波变化剧烈,产生较大的气动载荷,可能带来乘客舒适性、车体及部件和洞内固定设备气动疲劳破坏问题,给列车安全运行带来隐患。基于CFD软件,采用三维可压缩非定常湍流流动的流动模型压力修正算法和任意滑移界面网格技术,本文对高速列车隧道内等速和不等速交会压力波进行数值模拟,分析了列车交会过程车体外部压力场变化过程,较为详细描述了头头交会、头尾交会及尾尾交会时列车头尾部部位压差的变化过程,分析了等速和不等速交会时车外及洞内压力波的变化特性,初步给出了交会时变速度列车的负压峰值绝对值与车速的拟合关系式。
Abstract
The drastic crossing pressure of two high-speed trains in the tunnel will produce the larger aerodynamic loads, also may damage the fixed equipment in the tunnel and cause the fatigue failure problem of train’s body and component, bring hidden trouble to the safe operation of the train. Adopting the algorithm of pressure correction of three-dimensional, unsteady and compressible turbulent flow, numerical simulation shows that the pressure waves were brought by two high-speed trains passing by each other in a tunnel with the same or different velocity, using the commercial CFD software and an arbitrary sliding interfaces mesh technique. The results revealed the pressure fluctuation around the trains during them passing each other. The details of pressure distribution characteristics were well depicted the train head to head, head to tail and tail to tail passing each other. Furthermore, the pressure variation performances of the train’s surface and near to tunnel regions were concluded under the same and different speed. As referable results, a fitted relationship between the absolute value of negative pressure peak and the train speed was provided.
关键词
关键词:高速列车 /
隧道 /
交会压力波 /
数值模拟
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Key words
High-speed train /
Tunnel /
The train crossing pressure wave /
Numerical simulation
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