摘要
Abstract
In order to explore the aerodynamic characteristics of high-speed trains at different wind attack angles and wind direction angles,the wind field where the high-speed train is located is studied by numerical simulation.The AR model method is used to simulate the pulsating wind speed series of the moving point of the train,and the static wind force and jitter wind force of the train are calculated according to the relationship between the wind speed and the aerodynamic force under the assumption of quasi-fixed length,and the influence of different parameters on the calculation results is analyzed.The results show that at the same simulation point,the pulsation amount of vertical pulsating wind is smaller than that of downwind pulsating wind.The same wind attack angle,the larger the wind direction angle,the smaller the static wind force.The same wind direction angle,the closer the wind attack angle is 3°,the smaller the static lateral force.The closer the wind attack angle is to 0°,the smaller the static lift force.With the transition of the wind attack angle from-3°to 3°,the pulsating lateral force gradually decreases at the same vehicle speed,while the pulsating lift first decreases and then increases.Under the same wind attack angle,with the increase of wind direction angle,the standard deviation of pulsating lateral force first increases and then decreases.Except for the wind attack angle of-3°,the other two types of pulsating lift decrease first and then increase.The degree of dispersion of aerodynamic forces,that is,the coefficient of variation has little to do with the angle of attack of the wind,mainly related to the angle of wind direction,and the larger the angle of wind direction,the greater the coefficient of variation.关键词
横风/高速列车/风攻角/时间序列法/气动力Key words
crosswind/high-speed trains/wind attack angles/AR model/aerodynamics分类
交通工程
