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就几种典型形状列车车头,在简化列车外形的情况下,针对高速列车不同运行速度下的气动阻力和升力进行计算.为计算阻力和升力系数,将三维雷诺平均化N-S方程(RANS)结合k-ε湍流模型,用有限体积法(FVM)将控制方程离散求解.用SIMPLE法耦合压力-速度场,通过解类Poisson方程,对压力迭代地修正.模拟计算结果显示采用向首部有收缩的头部形状可获得较好的空气动力学性能;综合考虑与权衡稳定性与机动性,在更高速情况下运行的列车宜优先采用向首部有收缩的头部形状.图7,参12.
In order to calculate the drag coefficient and lift coefficient, three-dimensional Renault averaging NS equations (RANS) are combined with k -ε turbulence model, the governing equations are discretely solved by the finite volume method (FVM), the pressure-velocity field is coupled by the SIMPLE method, and the pressure is iteratively corrected by solving the Poisson’s equation. The simulation results show that the head- The shape of the section gives better aerodynamic performance; considering the trade-off between stability and maneuverability, trains operating at higher speeds should prefer to have a head-shaped head that contracts towards the head.