Analysis of Aerodynamic Characteristics of a Subway Train Running in the Tunnel
In this paper,the aerodynamic effect of subway trains running in the tunnel of Line 4 in a city is investigated.STAR-CCM commercial software is used to simulate the situation of subway trains running in the most unfavorable tunnel.This paper analyzes the resistance coefficient of subway train,the pressure on the surface of the train and the change of the pressure inside the train,so as to have certain reference value for the safe operation of urban subway and the guarantee of passenger comfort.According to the data analysis,the following conclusions can be drawn:firstly,the resistance coefficient of the front car and the rear car is greater than that of the middle four cars;secondly,in terms of the pressure change in the subway,the pressure change of the head car is the worst,and the head car is weakened in turn from the beginning to the tail car;thirdly,in the case of the same vehicle technical parameters,the interior pressure change of the first car is greater than that of the tail car,and the degree decreases from the head car to the tail car.According to the calculation,the airtightness index of the subway line should not be less than 1s,preferably greater than or equal to 3 s.
subway trainrunning in the tunnelaerodynamic characteristicpassenger comfortdrag coefficient
NETL
NSTL
万方数据
