全封闭声屏障列车活塞风压研究

Study on Piston Wind Pressure of Train inside a Fully-enclosed Noise Barrier

以某城际轨道交通工程为例,通过CFD模拟,计算全封闭声屏障内列车行驶产生的活塞风压,作为结构设计的依据。计算中考虑单车通过、两车在声屏障端部截面交会以及截面突变处交会的不同工况。计算结果表明,在全封闭声屏障顶部设置通长1 m宽通风排烟口、车速120 km/h的条件下,列车行驶产生的活塞风压范围为-192~392 Pa。

Taking an intercity rail transit project as an example,CFD simulation is used to calculate the piston wind pressure generated by the train running in the fully enclosed noise barrier,which can be used as the basis for structure design.In the calculation,the different working conditions are considered including single train passing the noise barrier,two trains meeting at the end of the noise barrier,and two trains meeting at the intersection of the noise barriers.The calculation results show that the piston wind pressure generated by the running of the train ranges from-192 to 392 Pa under the condition that a 1m-wide ventilating smoke outlet is set at the top of the fully enclosed noise barrier and the speed is 120 km/h.