Heat Flow Analysis Of SUV Engine Cabin Of Direct Injection Gasoline Engine

With the development of technology and the advent of the artificial intelligence era,people's demand for automobiles is no longer simply sheltered from wind and rain.Functionality,technology,streamline,comfort and sportiness have become the choice of people to buy cars.The increase in functionality,the improvement in comfort and the improvement in sportiness have also raised the requirements for the structure and arrangement of the engine compartment of the vehicle.The engine compartment is the most concentrated area of the main components of the car.The heat flow characteristics in the cabin not only affect the internal flow resistance,but also affect the performance of some important components(such as engine,ECU,sensor)and the performance of the whole vehicle.The increase in vehicle power,especially the application of direct injection gasoline engine has increased the heat generated by the engine itself,the radiator and the exhaust manifold,which puts higher demands on the thermal management of the engine room.This paper takes a real vehicle SUV as the research object,and uses heat transfer and computational fluid dynamics to simulate and analyze the flow field and temperature field in the engine compartment of the target model.The simulation calculation and analysis found out the parts with too high engine compartment temperature,and at the same time found that the fan cover and the transmission were in heat damage,exceeding its temperature limit,optimized it to reduce the influence of heat return and heat radiation,so that the whole vehicle The engine compartment thermal management problem has been reasonably solved.(1)Carry out a complete vehicle thermal balance test of the target vehicle to determine the key points;(2)Through the simulation results of three working conditions,the high-temperature components in the engine compartment—the exhaust manifold and the components that cause heat damage—the fan cover and the transmission are obtained.Aiming at this problem,the flow field characteristics of the heat flow in the engine cabin and the distribution of the high temperature zone are analyzed,and an optimization scheme is proposed;(3)Perform error analysis on the temperature data collected from the thermal damage test and the temperature data from the simulation calculation to verify the accuracy and validity of the simulation results;(4)According to the problems,the flow field characteristics of the heat flow in the engine compartment and the distribution in the high temperature region are analyzed,and an improvement plan is proposed.Optimize the shape of the deflector to reduce heat backflow.A sealing sponge is installed between the air deflector and the radiator bracket to prevent air leakage and increase the flow of cooling air.Install a heat shield on the front catalyst to reduce the effects of heat radiation.In this paper,the temperature field and flow field distribution in the engine compartment of the target vehicle under different operating conditions are studied,and the error analysis of the vehicle heat balance test and simulation results is carried out,which provides a certain study on the thermal management of the engine compartment of the vehicle.reference.