兰州-新疆线强侧风作用下车辆的气动特性

对试验列车上、下行通过“猛进东”测风点时的车体表面压力分布情况进行分析,采用分块积分法得出试验列车上、下行通过“猛进东”测风点的气动力。利用流场计算软件FLUENT对列车在大风作用下通过“猛进东”时的情况进行数值模拟计算,并与实车试验结果进行对比分析。结果表明：车体迎风面及背风面表面压力分布规律基本一致,验证了数值模拟计算模型的准确性;车辆受到的气动力中除升力的实验值与模拟结果相差较大外,主要导致车辆倾覆的横向力和倾覆力矩的实验值与模拟结果相差较小,满足工程应用要求。

Train aerodynamic characteristics in strong cross-wind on Lanzhou-Xinjiang railway line

The pressure distribution on external surface of the test vehicle was analyzed when it passed the anemology station on the east of "Mengjin" from upward and downward.The vehicle aerodynamic forces by piecewise integrating technology were obtained.Numerical computation was carried out by FLUENT for the test train passing by the east of "Mengjin",and the computation result was compared with that of the real vehicle measurement.The results show that the pressure distribution on external surface at both windward and leeward is basically the same.(Among) the train aerodynamic forces,for the lift force,the simulated and tested results have a few differences,but for the side force and overturning moment,which mainly cause()vehicle's(overturn) have little gap.Thus,the result obtained by numerical computation can meet the requirement of engineering application.