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应用FLUENT软件对侧风影响下高速公路汽车运行时的气动特性进行了三维稳态数值模拟,研究了透风型挡风墙在不同位置时汽车气动侧向力系数、升力系数及倾覆力矩系数随横摆角变化的特征,并与不设挡风墙的流场特征进行了对比。结果表明,修筑透风型挡风墙能够有效地减弱侧风对小轿车的作用力;同一侧风状态下,透风型挡风墙的不同修筑位置对应不同的汽车的气动侧向力系数、升力系数及倾覆力矩系数。汽车运行速度为120km.h-1,横摆角为31.0°或36.9°时(侧风风速为20m.s-1和25m.s-1),透风型挡风墙最佳的修筑位置为距离路肩2.1m,此时的倾覆力矩系数最小;当横摆角为42.0°或46.4°时(侧风风速为30m.s-1和35m.s-1),透风型挡风墙的最佳修筑位置为距离路肩2.4m。
FLUENT software was used to simulate the aerodynamic characteristics of expressway vehicles under the influence of crosswind. The aerodynamic lateral force coefficient, lift coefficient and overturning moment coefficient of the ventilated type wind-shield wall at different positions were studied. The characteristics of the variation of the swing angle are compared with those of the flow field without the wind wall. The results show that the construction of ventilated wind wall can effectively weaken the crosswind force on the car; under the same crosswind condition, the different building positions of the ventilated type wind wall correspond to different aerodynamic lateral force coefficient, lift coefficient And overturning moment coefficient. When the running speed of the car is 120km.h-1, the yaw angle is 31.0 ° or 36.9 ° (the wind speed of the crosswind is 20m.s-1 and 25m.s-1), the best construction position of the ventilated type wind wall is the distance Shoulder 2.1m, at this time the coefficient of overturning moment minimum; when the yaw angle of 42.0 ° or 46.4 ° (crosswind speed of 30m.s-1 and 35m.s-1), the best construction of ventilated type wind wall The location is 2.4m from the road shoulder.