地铁入口处缓冲结构对车体压力的影响研究

发布时间：2018-04-24 06:53

  本文选题：缓冲结构 + 车体压力　； 参考：《铁道科学与工程学报》2014年03期

【摘要】：为了将地铁瞬变压力的波动控制在人体舒适度范围内,根据三维不可压缩Navier-Stokes方程和标准k-ε紊流模型,以22.73 m2的地铁区间矩形隧道为研究对象,建立隧道-列车-空气数值模型,分析地铁隧道中列车特征部位压力和压力梯度的变化规律和影响因素。研究结果表明:列车运行速度超过100 km/h后,有必要在地铁入口处设置缓冲结构;缓冲结构降低压力最大值的效果并不显著,但降低压力梯度最大值的效果显著;喇叭型缓冲结构是优选的地铁入口降压措施;缓冲结构的最佳长度为2倍隧道水力直径;缓冲结构的横断面积越大,其降压效果越好;缓冲结构的最佳开孔率为30%左右。
[Abstract]:In order to control the fluctuation of the transient pressure in the human body, according to the three-dimensional incompressible Navier-Stokes equation and the standard k- 蔚 turbulence model, the tunnel train air numerical model is established with the rectangular tunnel of 22.73 m2 as the research object. The variation law and influencing factors of pressure and pressure gradient in train characteristic position in subway tunnel are analyzed. The results show that when the train speed exceeds 100 km/h, it is necessary to set up buffer structure at the entrance of the subway, the effect of reducing the maximum pressure of the buffer structure is not significant, but the effect of reducing the maximum pressure gradient is obvious. The optimum length of the buffer structure is 2 times the hydraulic diameter of the tunnel, the bigger the cross section product of the buffer structure is, the better the pressure relief effect is, and the optimum opening ratio of the buffer structure is about 30%.
【作者单位】： 中南大学土木工程学院;中南大学高速铁路建造技术国家工程实验室;
【基金】：国家重点基础研究发展计划项目(2011CB013802) 国家自然科学基金资助项目(U1134208) 中南大学研究生自主探索创新项目(2014zzts235)
【分类号】：U451.3;U270.1
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本文编号：1795595