轨道交通全封闭式声屏障列车风压载荷特性分析

Analysis on Train Wind Pressure Load Characteristics of Fully Enclosed Sound Barrier of Rail Transit

基于雷诺平均湍流模型与滑移网格方法,数值模拟了轨道交通车辆通过全封闭式声屏障时声屏障表面风压载荷特性,根据特征波叠加理论计算了声屏障表面脉动风压时程,分析了脉动风压幅值在声屏障内的空间分布特性。结果表明:声屏障同一截面不同测点位置的风压载荷时间变化规律相似,但压力幅值随着测点高度增加而逐渐减小;列车单列通过时,远离运行线路侧声屏障的压力幅值远小于邻近运行线路侧;列车运行速度由80 km/h提高至140 km/h,脉动风压空间分布特性相似,但压力幅值增加约22%;列车会车通过时,声屏障入口与出口端压力波的叠加效应使得声屏障表面压力幅值增大,其中位于远离运行线路侧声屏障压力幅值增加,与邻近运行线路侧声屏障压力幅值接近。

Based on the Reynolds-averaged turbulence model and sliding grid method,the wind pressure load characteristics of the sound barrier surface of rail transit vehicles passing through the fully enclosed sound barrier are numerically simulated.According to the characteristic wave superposition theory,the time history of fluctuating wind pressure on the surface of the sound barrier is calculated,and the spatial distribution characters of fluctuating wind pressure amplitude within the sound barrier are analyzed.The result shows that the time variation of the wind pressure load of the same section of the sound barrier is similar at different measuring points,but the pressure amplitude gradually decreases with the increase of measure point height.When a single train passes,the pressure amplitude away from the sound barrier on the side of the running line is much smaller than that on the side of the adjacent running line.When the running speed of train is increased from 80 km/h to 140 km/h,the spatial distribution characters of fluctuating pressure are similar,but the pressure amplitude is increased about 22%.When two trains are rendezvoused,the superposition effect of pressure wave at the inlet and outlet of sound barrier will make the surface pressure amplitude of sound barrier increase,in which the pressure amplitude of the sound barrier located far from the side of running line increases and is close to that of the side of adjacent running line.