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The influence of reduced cross-section on pressure transients from high-speed trains intersecting in a tunnel
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.jweia.2020.104161
Yibin Lu , Tiantian Wang , Mingzhi Yang , Bosen Qian

Abstract Alleviation of the pressure transients caused by high-speed trains intersecting in a tunnel with partially reduced cross-section is investigated by numerical simulation. The RNG k-e turbulence model and hybrid grid are adopted for the numerical simulation, which is validated by the moving model test. Two factors, the length of reduced section (L) and the train marshalling number, are considered to analyse the alleviation effect. The results show that, for reduction of the pressure transients induced by the intersection of three-car marshalling trains, the location of the change in cross-section is supposed to be near the location of the maximum value of the initial expansion wave (L → 240 ​m). In addition, for four-car marshalling trains intersecting in a tunnel of L ​= ​240 ​m, the excavation volume of the tunnel (tunnel volume) decreases by 14.4%, and the average pressure amplitude on the train surface decreases by 7.9%. Especially the pressure amplitude at the measurement point in the streamlined area of the tail car decreased by 28.6%. The reduced section tunnel has a good effect on decreasing the pressure transients around train body and the tunnel excavation volume (construction cost), which helps the tunnel design process.

中文翻译:

截面减小对隧道高速列车相交压力瞬变的影响

摘要 通过数值模拟研究了高速列车在部分减小截面隧道中相交引起的压力瞬变的减轻问题。数值模拟采用RNG ke湍流模型和混合网格,并通过运动模型试验进行验证。考虑缩减段长度(L)和列车编组次数两个因素来分析缓解效果。结果表明,为了降低三车编组列车相交引起的压力瞬变,截面变化的位置应该在初始膨胀波的最大值位置附近(L → 240 米)。此外,对于在L = 240 m 的隧道中相交的四节编组列车,隧道开挖量(隧道容积)下降14.4%,列车表面平均压力幅值下降7.9%。尤其是尾车流线型区域测量点的压力幅值下降了28.6%。缩截面隧道对降低车体周围压力瞬变和隧道开挖量(施工成本)有很好的效果,有助于隧道设计过程。
更新日期:2020-06-01
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