论文部分内容阅读
强横风引起的气动横向力和气动升力是造成列车被吹翻事故的主要原因。空棚车由于其侧壁迎风面积大且质量轻,很容易在强横风作用下发生倾覆事故。采用流场数值计算方法,对垂直侧壁、弧形侧壁和外折形侧壁3种棚车外形方案,研究了横风作用下的棚车空气动力特性:气动横向力、升力和气动倾覆力矩。研究结果表明:车体受到的气动倾覆力矩主要是由气动横向力产生的;弧形侧壁和折形侧壁可以有效地改善车辆横向气动性能,降低车辆的气动倾覆力矩,提高车辆的稳定性;与垂直侧壁棚车相比,当车体宽度为3.2 m时,弧形侧壁和外折形侧壁棚车的气动倾覆力矩均可以下降21%左右,空载棚车倾覆临界风速可以提高2.7 m2.s-1。
Typhoon caused by pneumatic lateral force and aerodynamic lift is the main cause of the train was blown over. Empty box car because of its large side windward area and light weight, it is easy to happen under the action of the typhoon overturned. The flow field numerical calculation method is used to study the aerodynamic characteristics of the box car under the action of transverse winds: aerodynamic transverse force, lift force and pneumatic overturning moment for three kinds of box car profiles with vertical side wall, curved side wall and outer fold side wall. The results show that the aerodynamic overturning moment of the car body is mainly caused by the aerodynamic lateral force. The curved side wall and the folded side wall can effectively improve the lateral aerodynamic performance, reduce the vehicle overturning moment and improve the stability of the vehicle ; Compared with the vertical side box box car, the aerodynamic overturning moment of the curved side wall and the outer box side wall box can be reduced by about 21% when the body width is 3.2 m, and the critical wind speed of empty box box overturning can be increased by 2.7 m2 .s-1.