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以SAE(美国机动车工程师学会)模型为研究对象,采用计算流体力学数值模拟方法研究非光滑表面布置位置对车身气动性能的影响.通过对钝体模型的不同位置(侧部、底部、顶部、尾部)布置凹坑型非光滑表面,计算钝体模型的空气阻力系数,比较光滑表面与非光滑表面速度矢量、压力以及湍动能,分析了非光滑表面气动减阻机理和减阻效果差异的原因,根据分析结果得到在模型的侧部、顶部、尾部和底部布置非光滑表面均能起到减阻作用,尾部非光滑表面的减阻效果最明显,减阻率达到5.73%.
The SAE (American Society of Automotive Engineers) model was used as the research object, and the influence of the non-smooth surface location on the aerodynamic performance of the vehicle body was studied by the numerical simulation method of computational fluid dynamics (CFDA) .According to the different positions of the blunt body model (side, bottom, Tail), the air resistance coefficient of blunt body model was calculated, and the velocity vector, pressure and turbulent kinetic energy of smooth surface and non-smooth surface were compared. The reason of the difference between the aerodynamic drag reduction mechanism and drag reduction effect was analyzed. According to the analysis result, the non-smooth surface is arranged on the side, top, tail and bottom of the model to reduce the drag. The drag reduction effect of the tail non-smooth surface is the most obvious, and the drag reduction rate reaches 5.73%.