不同高度声屏障对磁浮列车气动效应影响研究

Influence of the height of sound barrier on aerodynamic effects of maglev train

为给磁浮列车轨道两侧声屏障高度合理设计提供参考,基于三维可压缩、非定常N-S方程和k-ε湍流模型,用数值模拟方法研究磁浮列车在不同高度的声屏障内交会时,磁浮列车、声屏障及电缆的气动效应。研究结果表明,声屏障高度对磁浮列车表面压力和侧向力影响较小,对声屏障自身表面压力和电缆盒冲击载荷影响较大。声屏障纵向表面压力变化最大值和气动载荷最大值均出现在磁浮列车头头交会截面处,垂向表面压力变化最大值出现在3.6 m高处;随着声屏障高度增加,声屏障气动载荷增大,声屏障高度为5 282 mm和3 700 mm时,最大声屏障表面气动载荷相对1 500 mm高时声屏障分别提高了106.7%和71.1%,相同高度测点压力变化幅值最大增加56.6%。声屏障内侧布置的电缆盒所受纵向冲击载荷随着声屏障高度的提高也有明显升高。

In order to provide reference for rational design of heights of sound barriers on both sides on maglev train tracks’ the numerical simulation was conducted in this paper based on the three-dimensional unsteady Navier-Stokes equations and k-epsilon turbulence model. The aerodynamic effects of maglev trains’ sound barriers and cable boxes were investigated when the trains pass by each other through sound barriers of different heights. The study shows that the heights of sound barriers have slight effect on the surface pressure and the lateral force of the trains. While they have great effect on the surface pressure of sound barriers and the aerodynamic load of cable boxes. Both the maximum amplitude of longitudinal surface pressure of sound barriers and the maximum aerodynamic load appear on the head-to-head section of maglev trains as they pass by each other’ and the maximum amplitude of vertical surface pressure emerges on the height of 3.6 meters of sound barriers. Besides’ as the heights of sound barriers increase’ their aerodynamic load also increases when the heights reach 5 282 mm and 3 700 mm relative to 1 500 mm respectively, the maximum aerodynamic load arise 106.7% and 71.1% respect ively. On the measuring points of the same h e igh ts, the maximum amplitude o f pressure increases 56.6%. In addition, the impact load on cable boxes arranged inside sound barriers increase clearly as the heights of barriers inc rease.