摘要
为保证列车在强风沙环境下安全运行,本文研究挡风墙布设对高速列车周围流场特性的影响.借助CFD方法,运用DPM模型,在强风沙环境下,对有无挡风墙两种情况所导致的其他变量进行对比分析,对不同强度的风沙通过挡风墙的情况进行数值模拟,研究挡风墙背风侧流场特性及挡风墙结构参数对强风沙的响应规律.结果表明,在未布设挡风墙时,携沙气流遇到路堤后在路堤的路肩处形成分区,在迎风侧路肩上方位置风速急剧增大,对路肩的侵蚀最为严重;在布设挡风墙后,携沙气流遇到挡风墙出现速度分区的现象,高速区由路堤的路肩前移到挡风墙上方区域,同时挡风墙也起到了净化气流的作用,减少了沙粒沉积在轨道的数量;不同风速的携沙气流通过挡风墙时,风速垂直廓线的规律大致相同,呈现先缓慢波动增长、后指数规律增长的趋势,最后逐渐接近初始风速.
In order to ensure the safe operation of the train under strong wind and sand environment,this paper discusses the influence of windshield wall layout on the flow field characteristics around high-speed trains.With the help of the CFD method and the DPM model,the other variables caused by the presence or absence of the windshield wall were compared and analyzed,and numerical simulation of wind and sand of different strengths through the windshield wall under the strong wind and sand environment.The characteristics of the leeward side flow field of the windshield wall and the response of the windshield wall structure parameters to strong sand were studied.The results show that when the windshield is not installed,when the sand-bearing airflow encounters the embankment and forms a partition at the shoulder of the embankment.The wind speed increases sharply above the shoulder of the windward side,and the erosion of the shoulder is serious.After the windshield is installed,the sand-carrying airflow encounters the phenomenon that the windshield forms a speed divisions,and the high-speed zone is moved forward from the shoulder of the embankment to the windshield wall area,the windshield wall also plays a role of purifying the airflow and reducing the number of sand particles deposited on the track;when the wind-carrying airflow with different wind speeds passes through the windshield wall,the vertical profile of the wind speed is roughly the same,showing a trend of increasing exponential growth after slow fluctuations first,and then gradually approaching the initial wind speed.
作者
岳海燕
金阿芳
高卫强
YUE Haiyan;JIN Afang;GAO Weiqiang(College of mechanical engineering,Xinjiang University,Urumqi Xinjiang 830047,China)
出处
《新疆大学学报（自然科学版）》
CAS
2020年第1期102-108,117,共8页
Journal of Xinjiang University(Natural Science Edition)
基金
国家自然科学基金项目(11662019,51968069).
关键词
风沙
挡风墙
响应规律
流场特征
数值模拟
sand
wind-break wall
response law
flow field characteristics
numerical simulation
