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为了评估前围局部造型参数对大客车气动特性的影响,结合Ahmed模型及其风洞试验数据,论证数值模拟方案的有效性;针对12 m大客车模型评估前围局部特征,包括前顶弧、前侧弧以及前扰流板对大客车气动阻力和升力系数的影响规律。研究表明:前顶弧半径、前侧弧半径以及前扰流板角度增加时,客车的气动阻力系数降低,气动升力系数升高;对气动阻力影响程度的大小依次为:前侧弧半径>前顶弧半径>前扰流板角度,而对气动升力影响无显著差异。
In order to evaluate the influence of the local modeling parameters on the aerodynamic characteristics of the bus, the effectiveness of the numerical simulation scheme is demonstrated based on the Ahmed model and the wind tunnel test data. For the 12 m bus model, the local characteristics of the front fence, including the top front arc, Influence of frontal arc and front spoiler on aerodynamic drag and lift coefficient of bus. The results show that the aerodynamic drag coefficient of the bus decreases and the aerodynamic lift coefficient increases when the radius of the front arc, the radius of the front arc and the angle of the front spoiler increase. The order of influence on aerodynamic drag is as follows: Top arc radius> front spoiler angle, and aerodynamic lift no significant difference.