明洞式隧道洞门开口率优化

发布时间：2018-02-22 21:09

本文关键词： 隧道工程缓冲结构开口率高速列车初始压缩波气压爆波　出处：《哈尔滨工业大学学报》2017年03期 　论文类型：期刊论文

【摘要】：为获得等截面开口型缓冲结构相对最优开口率,基于三维非定常可压缩雷诺时均N-S方程和标准κ-ε双方程湍流模型,采用滑移网格方法,对3车编组的高速列车分别以250、300、350 km/h速度通过开口率在20%~84%之间的等截面开口型缓冲结构进行模拟,并对隧道内初始压缩波和隧道出口气压爆波进行研究.结果表明:数值计算结果与动模型试验相比,波形吻合度较好,幅值偏差均不超过6%;开口对初始压缩波形幅值起到增大作用,并随开口增大而先增大后减小,在开口率为60%时达到最大;初始压缩波压力梯度受开口影响显著,随着开口率增大而减小,且在开口率为40%以后变化不大,气压爆波随开口率变化规律与初始压缩波压力梯度基本一致.
[Abstract]:In order to obtain the relative optimal opening rate of the open buffer structure with constant cross-section, the sliding grid method is used based on the three-dimensional unsteady compressible Reynolds average N-S equation and the standard 魏-蔚 two-equation turbulence model. This paper simulates the equal-section open-end buffer structure of the high-speed train formed by three cars at the speed of 250,300,350 km/h. The opening rate is between 20% and 84%. The initial compression wave in the tunnel and the explosion wave at the exit of the tunnel are studied. The results show that the numerical results are in good agreement with the dynamic model test. The amplitude deviation is not more than 6, the opening increases the amplitude of the initial compression waveform, and then decreases with the increase of the opening, and reaches the maximum when the opening ratio is 600.The pressure gradient of the initial compression wave is significantly affected by the opening. It decreases with the increase of opening rate, and does not change much when the opening rate is 40%, and the pressure gradient of the initial compression wave is basically the same as the pressure gradient of the initial compression wave.
【作者单位】：中南大学交通运输工程学院;轨道交通安全教育部重点实验室(中南大学);
【基金】：高铁联合基金(U1134203,U1334205) 国家自然科学基金(51575538) 湖南省自然基金(14JJ3028) 湖南省研究生科研创新项目(CX2015B046) 中南大学教师研究基金(2013JSJJ014)
【分类号】：U451.3

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