低真空管道磁浮列车交会激波流场特性分析
Analysis on shockwave flow field characteristics of maglev train passing each other in low vacuum tube
黄尊地 1伊严严 1常宁 1梁习锋 2周镇斌 1刘夕语1
作者信息
- 1. 五邑大学轨道交通学院,广东江门,529020
- 2. 中南大学交通运输工程学院,湖南长沙,410075;中南大学轨道交通安全教育部重点实验室,湖南长沙,410075
- 折叠
摘要
为了解决管道列车高速运行时产生的激波等气动效应问题,通过建立三维仿真模型,针对不同阻塞比、线间距和列车外形,基于DES湍流模型,开展非稳态数值模拟研究,分析列车在低真空管道内交会时的激波流场结构、管道壁面压力、列车表面压力.研究结果表明:随阻塞比的增大,列车前端壅塞长度增加,且正压区域压力增大,激波反射更加剧烈,尾流激波反射强度增大,激波串长度加长;阻塞比增大有助于增大激波和膨胀波的入射角,从而增大激波和膨胀波的反射次数.随线间距的增大,管道内压力波动幅度相对增大,但改变线间距对管道内激波流场结构、管道壁面压力、列车表面压力的影响不大.列车头部压力和尾部激波强度与流线型长度存在一定的关系,随着列车流线型长度的增加,列车前端壅塞长度缩短,车头前端高压区壅塞强度和车尾末端尾流区域激波反射强度均减小.
Abstract
In order to solve the aerodynamic effects problem,such as shock waves,during the high-speed operation of pipeline trains,a three-dimensional simulation model was established and the unsteady numerical simulation was carried out based on DES turbulence model under the condition of different blocking ratios,line spacings and train shapes,and the shock flow field structure,pipeline wall pressure and train surface pressure when trains meet in a low vacuum pipeline were analyzed.The results show that with the increase of congestion ratio,the length of congestion at the front end of the train and the pressure in the positive pressure area increase.The shock wave reflection is more intense,the wake shock wave reflection intensity increases,and the shock wave string length lengthens.The increase of blocking ratio helps to increase the incidence angle of shock wave and expansion wave,which increases the number of shock wave and expansion wave reflections.With the increase of line spacing,the fluctuation range of the pressure inside the pipeline increases relatively,but the change of line spacing has little effect on the structure of the shock flow field inside the pipeline,the wall pressure of the pipeline and the surface pressure of the train.With the increase of the length of the train streamline,the length of the congestion at the front of the train is shortened,and the intensity of the congestion in the high-pressure area at the front of the train and the shock wave reflection in the wake area at the end of the train are reduced.
关键词
低真空管道/列车交会/阻塞比/线间距/列车外形Key words
low-vacuum piping/train rendezvous/blocking ratio/line spacing/train configuration引用本文复制引用
基金项目
江门市基础与应用基础研究重点项目(JZ202201)
五邑大学港澳联合研发基金(2021WGALH15)
广东省基础与应用基础研究基金联合基金-青年基金(2019A1515111052)
出版年
2024
国家科技期刊平台
NSTL
万方数据