Research On Wet Air Distribution Charateristics Of Electric Vehicle Chamber Based On Windscreen Fogging

The automobile industry is a quite significant slice of the Chinese economy,But new energy vehicles made up of electric vehicles became the new industrial tendency because of the problems of oil shortage,an unbalanced proportion of oil in energy consumption structure,and damage of environment due to the industrial development.In the development of electric vehicles,the security in the driving process and the energy-saving became critical issues.In the cold environment,the safety of drivers is not guaranteed because the temperature difference between inside and outside of the cab is large and high humidity built by the air conditioning produce fog on the wind glass of vehicles.For this reason,the author of this paper uses the academic ways of the combination of experimental research and simulation to study the distribution characteristics of wet air causing fog on the wind glass of electric vehicles and fog produced on the wind glass of electric vehicles.The author analyzes the heat transfer characteristics in the fogging process of wind glass of electric vehicles through building experimental research with building a experimental a test bench of fogging on vehicles' wind glass,and influence of super-hydrophilic and super-hydrophobic coating materials on fogging process on vehicles' window glass,and compared the fog-proof performance of the two coating materials.The research concludes that there are temperature gradient and humidity gradient in the air layer near the inner surface of glass when fog is produced,the super-hydrophilic coating material has good fog-proof performance of glass,followed by super-hydrophobicity.Those conclusions and experimental results provide a theoretical basis for the new method of synergistic fog-proof in a car compartment.On the basis of experimental research,the author of this paper optimizes and improves the research model of fogging and wet air distribution in automobile windows.Then,the author studies the fogging process and wet air content of automobile windows under different wettability of glass,different indoor and outdoor temperature,relative humidity,and indoor/outdoor wind speed conditions through FLUENT software,VOF model,evaporation-condensation model,and component transport model.The results show that the super-hydrophilic/hydrophobic coating material changes the attachment form of droplets on the glass surface: fogging on the window glass will change the distribution of wet air in the air layer near the window glass,and there are obvious temperature gradient and humidity gradient in the air layer near the window glass.The air closer to the window glass has the higher the temperature and the higher the humidityAccording to the comparative analysis of experiment and simulation results,we can conclude that the different effects of super-hydrophilicity and super-hydrophobicity on glass fogging,and find a new cooperative method of fog-proof in a car room.In the process of driving,the inner surface of front windshield treated with super-hydrophilic coating can ensure that the front windshield is not fogging,and the rear window glass and side wind glass are treated with the super-hydrophobic coating material to make the rear windshield and side glass fog-proof.It can also reduce energy consumption and increase the driving distance by reducing the power consumption of electric vehicle air conditioning.