高速地铁隧道洞口及风井对压力波的影响研究
Study on the Effect of Tunnel Opening and Air Shaft on Pressure Wave of High-speed Subway
那艳玲 1牟野 2叶天震 2卜永和 2江崇旭1
作者信息
- 1. 中国铁路设计集团有限公司,天津 300308
- 2. 天津大学,天津 300350
- 折叠
摘要
研究目的:地铁车辆由明线高速驶入隧道洞口和经过中间风井时,由于断面突变引起车厢内部压力剧烈波动,导致乘客不舒适,为解决该问题,本文使用三维可压缩黏性流体N-S方程和RNG k-ε两方程模型,研究不同中间风井位置和采取不同形式洞口缓冲结构工况对地铁隧道的空气动力学效应的影响.研究结论:(1)中间风井位置的不合理设置会导致膨胀波叠加使车厢内压力梯度不满足要求,可根据列车长度、列车运行速度等因素计算出中间风井的合理位置;(2)隧道洞口采取断面扩大型和喇叭型缓冲结构分别能使车厢表面压力梯度最大值下降29.3%和38.2%;(3)按照现行标准中人体舒适性的考核指标进行评价,140 km/h高速磁浮列车系统隧道口缓冲结构缓压段的长度设置为2倍的隧道断面水力直径更合理;(4)本文研究可以为优化高速地铁列车驶入隧道洞口时的气动效应问题提供参考.
Abstract
Research purposes:In order to solve the problem of passenger discomfort caused by the sudden change of section when the subway vehicle drives from the open line into the tunnel opening at high speed and passes through the intermediate air shaft,the three-dimensional compressible viscous fluid N-S equation and the RNG k-ε dual equation turbulence model are used to study the aerodynamic effects of the intermediate air shaft opening,closing and taking different forms of cavity buffer structure working conditions on the subway tunnel.Research conclusions:(1)The unreasonable setting of the location of the intermediate air shaft will lead to the superposition of the expansion wave,which can be calculated according to the length of the train,the train running speed and other factors to find out the reasonable location of the intermediate air shaft.(2)The adoption of cross-section enlarged and flared buffer structure in the tunnel opening can make the maximum value of the pressure gradient on the surface of the compartment decrease by 29.3%and 38.2%,respectively.(3)Evaluated in accordance with the assessment indexes of human comfort in the current standards,the length of the pressure-relief section of the buffer structure at the tunnel mouth of the 140 km/h high-speed magnetic levitation train system is more reasonable to be set at two times the hydraulic diameter of the tunnel cross-section.(4)This study can provide a reference to optimize the problem of the aerodynamic effect of high-speed subway trains when they drive into the tunnel.
关键词
高速地铁列车/空气动力学/压力波/风井位置/缓冲结构Key words
high speed subway trains/aerodynamics/pressure wave/location of air shaft/buffer structure引用本文复制引用
基金项目
天津市科委轨道交通科技重大专项(18ZXGDGX00080)
出版年
2024
NETL
NSTL
万方数据