空气动力制动前排风翼板制动力影响规律

Influence Rule of Aerodynamics Braking Force from the Front Brake Panel

为得到第1排风翼板对空气动力制动能力的影响规律,结合某高速列车车型,采用流体仿真软件FLUENT研究第1排风翼板高度和横向间距变化对后排风翼板的干扰规律。结果表明:第1排风翼板的高度变化对后排风翼板的流场影响较小,同时随着其高度的降低,后面2排风翼板产生的制动力变化不大,各排风翼板可提供的总制动力大幅降低;随着第1排风翼板横向间距逐渐增大,第2、3排风翼板提供的制动力不断增大,当第1排风翼板横向间距为400mm时,各排风翼板产生的总制动力值达到最大,空气动力制动能力有明显的提升。最后通过风洞试验验证了采用Realizable k-ε双方程模型模拟带风翼板高速列车外流场湍流的可靠性和计算精度。

In order to obtain the influence of the first brake panel on aerodynamic braking ability,based on a high-speed train model,fluid simulation software FLUENT was used to study the disturbance of the variation of the height and horizontal spacing of the first brake panel on the rear brake panels was analyzed.The results show that minor influence of the height variation of the first brake panel on the flow field of the rear brake panels.At the same time,with the reduction of the height of the first brake panel,the aerodynamic forces of the rear brake panels changed slowly,while the total braking forces generated by each brake panel declined greatly.With the increase of the horizontal spacing of the first brake panel,the braking forces produced by the rear two brake panels increased gradually.When the horizontal spacing of the first brake panel reached 400 mm,the total braking forces produced by brake panels reached a maximum,and the braking ability improved significantly.Finally,the reliability and calculation accuracy of using Realizable k-εtwo-equation models to simulate the external flow field of the train with brake panel were verified.