Analysis on Parameter Matching Design of Automobile Engine Cooling System
The matching of the cooling system directly affects the heat dissipation efficiency of the system,and then affects the ef-ficiency and economy of the engine.According to the structural characteristics of the engine cooling system of engineering vehi-cles,the cooling air volume,heat dissipation,water pump parameters and system matching were analyzed.Based on the analy-sis,the radiator and fan parameters of an engine model were designed,and the matching working point parameters were ana-lyzed.The matching design parameters were tested by using the engine cooling system test platform,and the rated operation pa-rameters were obtained.In order to verify the accuracy of the matching design,the temperature changes of the inlet and outlet of the engine radiator were analyzed.The results show that:when the fan works,with the increase of air flow,the system air resis-tance rises along the system resistance characteristic curve,intersects with the fan curve,and the intersection point is the wind re-sistance equilibrium point.The air flow corresponding to the intersection point is the design reference value.The parameter analy-sis shows that the air flow at the marked points in the vehicle design is about 14.1kg/s,and the static pressure is about 850Pa.Af-ter 840s,the inlet and outlet temperatures of the intercooling radiator are 68.5℃ and 58.9℃,and the inlet and outlet tempera-tures of the high temperature radiator are 85.5℃ and 74.9℃,which meet the heat dissipation requirements of the engine.The re-sults show the accuracy of the matching analysis,which provide a reference for this kind of design.
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