Abstract: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.
