城际铁路隧道列车风特性及对人员安全的影响分析

Characteristics of train wind and analysis of personnel security in inter-city railway tunnel

采用数值模拟方法,对列车在城际铁路隧道内运行过程中所产生的列车风变化过程进行分析,计算CRH2流线型列车在隧道内运行时,隧道内沿纵向不同位置列车风最大风速,进一步探讨隧道内列车风纵向和横向分布特性,并参考相关标准分析隧道内轨侧疏散通道、轨下疏散通道进行人员疏散时的安全性。结果表明:车头风速梯度很大,且在车头侧面空间出现风速转向,环隙空间内气流流动为典型的Couette湍流流动和Poiseuille湍流流动的叠加,车尾风速最大,对轨侧人员安全最为不利;CRH2流线型车以200 km/h速度运行时,轨侧疏散通道最大风速17.2 m/s,轨下疏散通道口及通道内最大风速分别为15.2和9.5 m/s。按照16.9 m/s风速标准进行判断,人员可从轨下疏散通道进行疏散。

By using the numerical simulation method, the maximum speed of train wind caused by the CRH2 was calculated. The change process, longitudinal and horizontal distribution characteristics of train wind in inter-city railway tunnel were studied. Security of people in evacuation passages aside or under rails was also studied by using reference standard from results of some scholars＇ study. Calculation results shows that： The gradient of wind speed in the same direction with train is huge in front of the train; the direction of the train wind is turning around aside the train head .The annulus flow could be viewed as combination of two kinds of flow i.e. the Couette turbulence caused by drag forces on train surfaces and the Poiseuille turbulence in rough areas caused by annulus pressure gradient. The train wind near the train tail, the speed of which is most intense, may cause danger to staff in tunnel. The maximum wind speed in evacuation passages aside rails is 17.2 m/s, under rails is 9.5 m/s, and in the entrance is 15.2 m/s, when the travelling speed of CRH2 train is 200 km/h. According to the wind speed standard of 16.9 m/s, people can be evacuated through the passage under rails.