400 km/h动车组车体压力载荷隧道参数影响特征研究-《高速铁路技术》

文章信息/Info

Title:: Study on Influence of Tunnel Parameters on Pressure Load of Carbody of 400 km/h EMU

作者:: 王志钧; 李艳; 魏康; 梅元贵; 魏德豪; 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. 中铁二院工程集团有限责任公司, 成都 610031

Author(s):: WANG Zhijun; LI Yan; WEI Kang; MEI Yuangui; WEI Dehao; 1. Gansu Province Engineering Laboratory of Rail Transit Mechanics Application Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: 400 km/h EMU|tunnel pressure wave|pressure load|tunnel parameters|one-dimensional flow model|the most unfavorable tunnel length

摘要:: 列车高速进入隧道时产生的压力波动对列车气动阻力、车体结构疲劳强度和车内人员舒适性等产生不利影响。随着动车组运行速度的不断提高，高速列车进入隧道产生的空气动力学问题将更加突出和显著。本文采用一维非定常不等熵流动模型和特征线方法，在数值模拟400 km/h动车组单列车通过隧道和隧道中央等速交会压力波形成机理和车外压力变化的基础上，研究了动车组通过隧道时隧道长度和隧道净空面积对车外压力载荷的影响特性，进一步验证了基于车外压力幅值的最不利隧道长度估算公式的合理性。本文研究结果为确定400 km/h动车组车体压力载荷的分布范围提供了基础数据。

Abstract:: The pressure fluctuation generated when a train enters a tunnel at high speed has adverse effects on the aerodynamic resistance of the train, the fatigue strength of the car body, and the comfort of the passengers. With the continual improvement of the running speed of EMU, aerodynamic problems caused by high-speed train entering tunnel will become more prominent and remarkable. In this paper, a one-dimensional unsteady unequal entropy flow model and characteristic line method are used to study the influence of tunnel length and tunnel clearance area on the pressure load outside the car when the EMU passes through the tunnel, based on the numerical simulation of the formation mechanism of the pressure wave and the change of pressure outside the car when the EMU passes through the tunnel, which further verifies the rationality of the estimation formula of the most unfavorable tunnel length based on the amplitude of pressure outside the car. The results provide basic data for determining the carbody pressure load distribution range of 400 km/h EMU.