Automobile drag coefficient optimization design method

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of automobile aerodynamics, and in particular relates to an optimal design method for the drag coefficient of an automobile. Background technique [0002] At present, the drag coefficient is a coefficient used to measure the resistance of the car to the wind when driving. The driving force of the car needs to overcome various resistances during driving, including rolling resistance, acceleration resistance (no acceleration resistance when driving at a constant speed), uphill resistance (no slope resistance when driving on flat ground) and air resistance, while the wind resistance coefficient and Air resistance is closely related. In addition, the top speed of the car is not only related to the maximum power of the engine, but also the drag coefficient can play a decisive role. [0003] There are three main types of air resistance. First, the resistance caused by airflow hitting the front of the vehicle; se...

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Problems solved by technology

[0007] (1) The structure of the automobile flow field is complex and highly nonlinear. Therefore, it brings great difficulties to the study of the optimization of the automobile drag coefficient. The optimization efficiency is low, the operation is complicated, and it takes a long time

[0008] (2) For the proxy model of the car, the static proxy model is usually used, and the accuracy of the CFD side simulation test is low

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