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本文基于三维、非定常、可压N-S方程和k-ε双方程湍流模型,对地铁列车以不同速度通过不同截面形状、不同长度隧道引起的气动效应进行了研究。结果表明:地铁列车相同速度通过三种不同截面形状隧道时,圆形截面隧道压力变化幅值最小,马蹄形截面隧道次之,矩形截面隧道最大;列车车体表面压力变化幅值近似与列车运行速度的平方成正比;在此次选择的地铁列车和隧道计算中,最不利隧道长度在2km左右,其最不利隧道长度会因列车运行速度、列车头部外形、隧道截面形状和面积大小等因素不同而有所变化。其结果可为车体气密性和通风设备进排风口位置的设计提供指导意义。
Based on three-dimensional, unsteady, compressible N-S equations and k-ε two-equation turbulence model, the aerodynamic effects of subway trains passing through different cross-sections and tunnels with different lengths at different speeds are studied in this paper. The results show that when the subway trains pass through tunnels with the same cross-section, the amplitude of the circular cross-section tunnel pressure is the smallest, the tunnel with the horseshoe cross-section is the second, and the tunnel with the rectangular cross-section is the largest. The amplitude of the train body surface pressure changes approximatively with the train speed Of the square; the choice of subway train and tunnel calculation, the most unfavorable tunnel length of about 2km, the most unfavorable tunnel length due to the train speed, the train head shape, tunnel cross-sectional shape and size of the area and other factors And change. The results provide a guideline for the airtightness of the car body and the design of the vents and vents for ventilation equipment.