Effect of Coolant Physical Parameter on Cooling Performance of Diesel Engine Cylinder Head
In order to explore the influence of various physical parameters of engine coolant on the cooling performance,the accuracy and reliability of simulation calculation were verified through bench test,and the influences,influencing significance degree and fitting relationship of coolant density,specific heat capacity,thermal conductivity and boiling point on the maximum surface temperature of cylinder head water jacket,the maximum temperature of fire surface,the temperature difference be-tween the coolant inlet and outlet and the gas volume in the cylinder head were determined by using numerical simulation,cor-relation analysis and regression analysis based on a high-power diesel engine cylinder head.In addition,the cooling effects of 50%volume concentration ethylene glycol solution and water were compared.The results show that the maximum tempera-tures of waterjacket surfaceandfire surfaceare positivelycorrelated with density,specific heat capacityand thermal conductiv-ity,and negatively correlated with the boiling point.The former is greatly affected by the boiling point and thermal conductivi-ty,while the latter is greatly affected by the boiling point.The temperature difference between inlet and outlet is negatively cor-related with density,specific heat capacity and boiling point,positively correlated with thermal conductivity,and greatly affect-ed by specific heat capacity.The gas volume is negatively correlated with the four physical parameters,which is most affected by the specific heat capacity and boiling point.Based on the regression analysis,the relations of maximum surface temperature of water jacket,maximum temperature of fire surface,temperature difference between inlet and outlet and gas volume are ac-quired,and the corresponding error for each relation is within 1%,0.5%,10%and 30%respectively.Under the same condi-tions,the cooling effect of water is better than that of ethylene glycol solution with 50%volume concentration.
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