关键词: 热管理；散热器；冷却系统；护风罩

Abstract: In order to continuously optimize the vehicle thermal management performance of a commercial vehicle, improve the flow field of the vehicle, optimize radiation performance of the cooling system, the influence of different air guide devices on the flow field characteristics of the engine compartment are studied by using computational fluid dynamics (CFD) technology. The paper matches a 13 L gas engine on a heavy-duty commercial vehicle, through optimizing the positioning of the engine and wind shield structure, the influence of two types of wind shield on the engine compartment flow field are compared and analyzed, the pressure and velocity distribution inside the engine compartment, as well as the airflow and return flow through various positions of the cooling system are obtained, it can provide reference for optimizing the thermal management of the engine compartment. The results show that flow line in the engine compartment with the lower height wind shield is more uniform under rated conditions and high torque conditions, and the flow rate at each position of the cooling module increases to varying degrees, and the reflux decreases.

Key words: Thermal management; Radiator; Cooling system; Wind shield