Characterization of Pressure Fluctuation During High-speed Train Tunnel Operation
In this paper,a domestic high-speed train with 8-car formation length is taken as the research object,and a coupled train-tunnel aerodynamic model is established.Based on the three-dimensional,non-stationary,compressible N-S equation and k-ε two-equation turbulence model,Fluent software is used to simulate the turbulence flow of a single train passing through a 1000 m-long tunnel with a headroom effective area of 100m2.The relative error between the three-dimensional flow model and the maximum pressure peak-to-peak value under the theoretical calculation formula of"iron standard"in this paper does not exceed 10.70%,which verifies the accuracy of the calculation results and the applicability of the numerical calculation method in this paper.After that,through numerical calculation,it is found that in the process of the high-speed train passing through the tunnel at a speed of 350km/h,from the head to the tail,the peak positive pressure gradually decreases,the absolute value of the peak negative pressure gradually increases,and the absolute value of the peak negative pressure is obviously larger than the peak positive pressure,and the absolute value of the peak negative pressure of the head car is 5 times that of the peak positive pressure,and the absolute value of the peak negative pressure of the tail car is 34.8 times that of the peak positive pressure.In addition,the rate of change of peak positive pressure between cars is larger than that of peak negative pressure,and the peak positive pressure of the head car is 5.27 times that of the tail car,while the absolute value of the peak negative pressure of the tail car is 1.32 times that of the head car.
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