基于成渝中线隧道参数CR450高速动车组气密性阈值分布特征研究
Research on Distribution Characteristics of Air Tightness Threshold of CR450 High speed EMU Based on Tunnel Parameters of Chengdu-Chongqing Middle Line
赵亮 1杜迎春 2梅元贵1
作者信息
- 1. 兰州交通大学 甘肃省轨道交通力学应用工程实验室,兰州 730070
- 2. 中国国家铁路集团有限公司,北京 100000
- 折叠
摘要
以成渝中线隧道特征为研究背景,利用一维可压缩不等熵流动模型的广义黎曼变量特征线方法,研究了CR450 高速动车组单列车通过隧道和两列车中央等速交会时,车内外压力波特征及隧道长度、速度、不同时间间隔内最大压力变化量对气密阈值影响特性.研究表明:最不利隧道内车外压力波动幅值最大,随着隧道长度增加,车内压力波动幅值增大;单列车满足车内每 3s内最大压力时时间常数阈值基本在最不利隧道内最大,交会时基于气密性的最不利隧道与根据车外压力载荷得到的最不利隧道长度不同;单列车时间常数阈值随速度的增加而增加,两列车以 430 km/h和 450 km/h交会时,时间常数阈值基本相同;单列车头尾车和中间车满足 13 个压力标准时时间常数阈值最大分别为 51s和 42 s,交会分别为 88s和 92 s.
Abstract
Based on the tunnel characteristics of the Chengdu-Chongqing Middle Line,using the generalized Riemann variable characteristic line method of one-dimensional compressible isentropic flow model,the characteristics of pres-sure waves inside and outside the CR450 high-speed EMU when a single train passes and two trains meet,and the characteristics of the influence of tunnel length,speed,and different pressures in different time intervals on the air-tight threshold are studied.The results show that the amplitude of external pressure fluctuation in the most unfavor-able tunnel is the largest,and the amplitude of internal pressure fluctuation increases with the increase of tunnel length;When a single train meets the maximum pressure in every 3 s,the time constant threshold is basically the maximum in the most unfavorable tunnel.The most unfavorable tunnel length based on air tightness is different from the most unfavorable tunnel length based on the external pressure load at the intersection;The time constant thresh-old of a single train increases with the increase of speed.When two trains meet at 430 km/h and 450 km/h,the time constant threshold is basically the same;The maximum time constant threshold for a single train's head car and tail car to meet 13 pressure standards is 51 s and 42 s respectively,while for passing scenarios it is 88 s and 92 s respec-tively.
关键词
成渝中线/隧道长度/速度/气密性/时间常数Key words
Chengdu-Chongqing middle line/tunnel length/speed/air tightness/time constant引用本文复制引用
基金项目
中国国家铁路集团有限公司科技研发计划(K2021J041)
出版年
2024
NETL
NSTL
维普
万方数据