Research On Calculation Method Of Heat Transfer Performance Of Automobile Radiator And Optimization Of Fin Structure

As one of the main components of the vehicle cooling system,the comprehensive performance of the car radiator can directly affect the life of the vehicle,the stability of the operation and the fuel economy.Based on the cooperative project of school and enterprise,this paper studies the heat transfer performance calculation method of automobile radiator by means of numerical simulation and experiment,and optimizes the fin unit of radiator based on comprehensive evaluation factor j/f^1/3.The main contents of this paper include the following points:（1）The local model of the 4-cycle finned group of the target louver radiator is established.Based on the local 6 iterations proposed for the iterative calculation of the model,the heat transfer performance of the radiator is calculated.The results show that:compared the simulation results to calculate target heat dissipation by local iteration method is proposed to calculate the local iteration based on the model and experimental results verified the feasibility of this method on heat transfer performance of radiator.（2）The porous media model of the target radiator is established,and the distribution resistance coefficient of the porous media model is set up based on the calculation results of the local model of the 4-cycle fin group,and the resistance performance of the radiator is calculated.The results show that the simulation results of the pressure drop of the gas side and the water side of the radiator are in good agreement with the experimental results.（3）The calculation model of 108 single-window window with different shutters,the spacing of the blinds and the fin spacing is calculated and the simulation results are calculated and the evaluation factors j/f^1/3 are used to find out the best performance in many structures.Blinds fins.The results show that the fin structure with the best comprehensive performance in the louver fin structure is the fin pitch 2.4mm,the louver space is 0.9mm,the opening angle is 27 degrees.（4）The heat transfer characteristics and the resistance characteristics of the optimal structure fin radiator under the set condition are calculated by using the 6 order iteration method and the porous medium model respectively,and compared with the target radiator.