The invention belongs to the technical field of automobile
aerodynamics, and particularly relates to an automobile
drag coefficient optimization design method, which comprises the following steps of: based on flow optimization design, determining mutual interference parameters of front and back flows and overall data of an automobile, and establishing a corresponding automobile model; according to the determined automobile wind resistance data, an automobile head, a flat floor, an upper automobile body part, an automobile
tail and a cooling
system are improved, and corresponding models are established; based on design elements in multiple aspects, the wind resistance coefficient of the automobile is comprehensively optimized, and the error between the design and the actual wind
resistance test is determined through stress analysis of the model; according to the corresponding errors, the vehicle head, the flat floor, the upper vehicle body part, the vehicle
tail and the cooling
system are corrected. According to the method, multi-factor condition analysis is carried out, and the factors influencing the automobile wind resistance parameters are analyzed, so that the automobile
machine changing scheme is systematically determined. Each step in the modification scheme is refined, the modification strategy of each part is summarized through a large number of experiments, and wind resistance parameter optimization is improved.