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建立了高速列车在隧道内和明线上交会的数值计算模型。利用有限体积法求解三维、可压、非定常N-S方程和k-ε两方程湍流模型,通过滑移网格技术实现列车的相对运动。分析了列车在隧道内和明线上以350 km/h等速交会过程中车体表面压力、气动荷载的变化规律。研究发现:列车在隧道内交会时,其车体表面压力比在明线上交会时约增加6 kPa,且车体表面压力的波动幅值是明线上交会时的2倍;交错车体表面的负压值比未交错表面的负压值大1.5kPa;气动力(矩)比在明线上交会时略小;头车、尾车气动阻力的变化规律与单车过隧道时相似,但阻力的变化峰值约是单车过隧道时的2.5倍。
A numerical model for the intersection of high-speed trains in the tunnel with the open line was established. The three-dimensional, compressible and unsteady N-S equations and k-ε turbulence model are solved by the finite volume method, and the relative movement of the train is realized by the sliding mesh technology. The variation regularity of the surface pressure and aerodynamic load of the train during the intersection of the tunnel and the open line at the speed of 350 km / h is analyzed. The study found that when the train renders a meeting in the tunnel, the surface pressure of the vehicle increases about 6 kPa more than that of the bright line, and the fluctuation amplitude of the surface pressure of the vehicle is twice that of the bright line; The pressure value is 1.5kPa less than the negative pressure value of the non-staggered surface; the aerodynamic force (moment) is slightly smaller than that of the straight line; the variation of the aerodynamic drag of the head car and the tail car is similar to that of the bicycle passing through the tunnel, About 2.5 times as long as a bicycle passes through the tunnel.