关键词: 商用车；空气动力学；风阻；外部特征；计算流体力学

Abstract: With the rapid development of logistics industry, more and more requirements are put forward for the economy and timeliness of commercial vehicles. Reducing driving air resistance to improve fuel economy has become a hot topic for major automobile manufacturers. Taking the cab of a commercial vehicle as the research object, the influences of different external characteristics on the external wind resistance of the commercial vehicle are studied by means of computational fluid dynamics. It includes the wind resistance influence of different angles of windshield, the wind resistance influence of different shapes of the rear view mirror shell, and the wind resistance influence of different states of the parts such as the corner plate, the external sun shield and the flow guide hood. The results show that the computational fluid dynamics optimization can greatly improve the aerodynamic performance, reduce the wind resistance, and effectively improve the fuel economy and power performance of the vehicle.

Key words: Commercial vehicle; Aerodynamic; Wind resistance; External characteristics; Computational fluid dynamics