Research on Aerodynamic Performance of High-speed Train through Canyon Wind Zone

On the basis of the three-dimensional unsteady compressible Reynolds-averaged N-S equation and the RNGκ-eequation turbulence model,the aerodynamic performance of the 8-vehicle high-speed train running into-out of a tunnel under canyon winds was simutaled,and the wind velocities along the railway line were monitored.The computational results show as follows:The numerical simulation results are consistent with those of wind tunnel tests;due to the influence of narrow passage effect and valley terrain,the wind velocity distribution on a bridge is asymmetric;the difference between aerodynamic force changes of the train entering into the canyon and those of the train running out of the canyon is significant;as the train is running at a high-speed on the railway line in the canyon wind zone,the aerodynamic forces and moment coefficents of the train are fluctuated obviously due to the gorge wind;out of the fluctuated changes,the changes of the tail vehicle lateral force coefficient and the head vehicle lift force coefficient are the largest,reaching 67% and 216% respectively.