强横风下列车出隧道时的瞬态气动性能

发布时间：2018-01-12 19:29

本文关键词：强横风下列车出隧道时的瞬态气动性能　出处：《中南大学学报(自然科学版)》2014年03期 　论文类型：期刊论文

【摘要】：运用滑移网格技术,选用工程上常用的k-ε双方程湍流模型,对横风环境下高速列车出隧道口时的瞬态空气动力特性进行数值模拟,得到不同风速、不同车速下列车受到的瞬态风荷载。计算结果表明:车体所受的瞬态风荷载在列车出隧道口的过程中急剧增大,随着列车逐渐脱离隧道而趋于常数;对车辆安全影响较大的侧向力、侧滚力矩中,头车受到的气动力变化幅值最大、尾车最小,中间车居中;列车出隧道过程是车体周围流场压力不断上升的过程;车体水平中心截面上的静压系数曲线在车头处存在1个大2个小共3个峰值;随着列车的运行,其中迎风面的第2峰值逐渐增大超过原最大峰值,而背风侧第2峰值基本保持不变。
[Abstract]:By using sliding grid technology, the transient aerodynamic characteristics of high-speed train at the exit of tunnel under crosswind environment are simulated by using the k- 蔚 two-equation turbulence model commonly used in engineering, and different wind speeds are obtained. The results show that the transient wind load on the train body increases sharply in the course of the train exit from the tunnel, and tends to be constant with the train leaving the tunnel gradually. In the lateral force which has a great influence on vehicle safety, the amplitude of aerodynamic change of the first car is the largest, the tail car is the least, and the middle vehicle is the center. The process of train exit from tunnel is the process of increasing the pressure of the flow field around the car body. The static pressure coefficient curve on the horizontal center section of the car body has 1 big, 2 small and 3 peak values at the front of the car. With the train running, the second peak on the upwind side gradually increases over the original maximum peak, while the second peak on the leeward side remains basically unchanged.
【作者单位】：长沙理工大学汽车与机械工程学院;中南大学轨道交通安全教育部重点实验室;中国铁道科学研究院信息研究所;
【基金】：国家自然科学基金资助项目(51075401,U1134203)
【分类号】：U451.3;U270.11
【正文快照】： 近年来,随着列车速度的不断提高,产生了一系列影响列车安全或运行环境的空气动力问题,为了研究此问题,逐渐形成了一门新兴学科——高速列车空气动力学,列车在强横风下的倾覆稳定性及列车进出隧道时的空气特性就是其中的关键内容,很多学者对此进行了研究。在隧道方面,研究主要

【参考文献】