Research On Low Aero-drag Design And Aerodynamic Optimization Of A Certain Passenger Car

According to Chinese economic development and human life improvement, the vehicle, as the most important transportation, goes into common people’s life gradually. The following problems of energy are highlighted day by day. In Chinese Manufacturing 2025, the idea of energy-saving & new energy vehicle was pointed out as an important development area, and energy-saving & emission reduction had already been the core work content for OEMs. Aerodynamic performance has great influence to vehicle handling performance, power performance and fuel & economy. The external flow filed character better or not will all impact vehicle comfort performance directly. Therefore, OEMs paid more and more attention to vehicle aerodynamic simulation analysis.In order to improve the aerodynamic performance of the automobile, the automobile enterprises put lots of manpower, material resources and financial resources to test and study the aerodynamic characteristics of the vehicle. The traditional research of vehicle aerodynamics is mainly based on the wind tunnel test, but the wind tunnel test is expensive, and there are too much time consuming and limited resources. In recent years, with the rapid development of computer, the theory of turbulence has been updated and improved. Computational fluid dynamics(CFD) method has been widely used in the research of vehicle aerodynamic performance. Taking advance CFD simulation to analysis and research external aerodynamic, also uses the method combined with the traditional research methods, greatly improve vehicle aerodynamic performance, and improve the efficiency of research and development, save the cost of research and development.Reasonable aerodynamic performance plays an important role in improving the performance of vehicle dynamics, economy and so on. Therefore, how to meet the requirements of modeling, engineering at the same time, but also to improve aerodynamic characteristics is particularly important for design a car.In this article, the vehicle aero character was checked by value simulation method in preliminary phase of the design & development, and then, the samples were built up for wind tunnel testing. Complete vehicle aero character optimization design and testing verification were done based on the comparison between wind tunnel testing result and simulation analysis model. This can reduce the cost of model modification and wind tunnel testing, but also can shorten complete vehicle aerodynamic validation cycles. It has important guiding significance to the certain model in Aerodynamic performance and fuel economy. Through the wind tunnel test and numerical simulation of aerodynamic characteristics of a vehicle, the method is studied in depth, and the reasonable improvement method is found. The work carried out on the development of the vehicle design has played a very important guiding significance, but also to enhance research and design ability to contribute to the country’s automobile industry.