Study On Simulation Of The Intelligent Cooling Module For Rear Engine Bus

Due to the depletion of petroleum and other non-renewable energy,the pollution of environment and improvement of humans living level day by day,the higher requirements of the engine power performance,fuel economy,and emissions is now more important.Although the technologies of exhaust turbo-charging,high pressure injection has been widely used on commercial vehicle engines,the engine power performance and fuel economy was improved obviously,but engine heat load is also improved,and lead to higher challenges to engine cooling system.The engine is usually put at the rear of the bus,the engine radiator and the intercooler depends on the fan to ventilate,and due to the limitation of the engine room,the radiator and the intercooler need to be designed as an integrated module.Generally the bus cooling system is directly coupled with the engine,the system is always under working,and then cause large power consumption,and also the e ngine cannot be worked at ideal water temperature,this directly relate to the engine fuel economy and stability.But now electric fan intelligent cooling module begins to use in the bus,the fan is not directly coupled with the engine anymore,which reduce the fuel consumption significantly.This paper first give a brief description of the material,process and application prospects of the radiator and the intercooler which are the main components of the intelligent cooling module,summarize the CFD technology development process and the application status for engines,introduce the CFD technical characteristics,theoretical basis and application area.Improve the cooling capacity and reliability of the cooling-Intercooler system to meet the high reliability,large cooling capacity,energy-saving design goals for the reared engine bus with atrocious conditions.Select the structure of the radiator and intercooler.Finally use the plate-fin heat exchanger,electric fan with blowing scheme as the structure of the radiator and intercooler.Two kinds of schemes are proposed,one is directly replace the electronic fans based on the traditional series cooling module,and the other one is a new parallel structure based on the electronic fan pressure-air volume property.Use CATIA software to build the model of the two structures’ cooling modules and the CFD commercial soft to mesh and simulate,compare the heat dissipation capacity of the series and parallel structures by simulation.The results show that when the electronic fan was used,the parallel radiators’ heat dissipation capacity is better than the series.And through the bench test to evaluate the reliability and heat dissipation capacity of the parallel structure,the test result meets the evaluation req uirements.Compare the results of wind tunnel performance test and FLUENT simulation,it show that the simulation accuracy is high,and it is proved that use FLUENT software to simulate and design the cooling module is reasonable.Finally,through the real vehicle test to prove the cooling module can fulfill the cooling requirements and the cooling capacity of the radiator and intercooler still have a certain margin.Achieve the design goals of the intelligent cooling modules with high reliability and large cooling capacity.Use FLUEN T software to simulate the heat transfer process of the cooling module can shorten the development time,reduce the development cost,and have high accuracy.Use CFD technology to simulate and optimize the design provides a new idea and method for the research of engine cooling system.