Experiment And Simulation Analysis Of Thermal Management On A Turbochargecf Intercooled Gasoline Engine

With the popularization of automobile, energy supply is becoming increasinglytense," energy saving, and environment protection " are the development directionand the goal of automobile engine technology. In order to improve fuel economyperformance of small-displacement gasoline engine, the technology ofturbocharger-intercooler is developed. However, this technology is also a factoraccounting for the increase of engine thermal load, due to the higher power it bringsin. Experimental investigation and simulation of engine cooling system are done inthis paper to solve cooling and heat balance problem. The thermal effect amongengine fluid systems must be considered in modern design, which is named thethermal management. On engine thermal management system simulation, it shouldcover the engine body fluid system, cooling system and air side system. Applicationof engine thermal management technology ensures the key components and systemssafe and efficient. Moreover, it can reduce emissions and improve energy efficiency.Because energy saving and new emissions regulations are put forward,automobile companies have increasingly recognized the importance of turbochargedintercooled gasoline engine on the products. This paper combines with the actualproduct development project, which is improved on the basis of the original naturallyaspirated engine to design a new turbocharged intercooled gasoline engine.Experimental study and simulation of the thermal management system has beencarried out to study the interaction relationship among the lubrication system, thecooling system and the air side system. Optimization of the cooling system hasshorten development cycle, and reduced development costs. Then, products weresuccessfully put into operation..Firstly, the engine thermal management system simulation platform is established. Working principle about CA4GC20T gasoline is studied, and Flowmastersimulation model is built, The influences of lubrication system and air-side system areembodied in this model.Secondly, cooling system pressure loss and flow rate are measured to evaluate thematching rationality of cooling system components. The system flow rate is morethan the system aim (197L∕min). And the test results are inputted to theone-dimensional simulation software FLOWMASTER as parameters. Then the heatdistribution in the engine cooling system is measured, which provide anotherparameter of the cooling system matching design of vehicle.Thirdly, the pressure distribution, the highest temperature and other informationof the simulation are analyzed, the results show that water temperature ofturbocharged engine is too high, which is equipped with the naturally aspirated relatedparts. Improvement work is done by analyzing parameters influence on radiatorefficiency, water pump and air side parts. With the improvement of water pump,radiator, air side parameters, matching prediction and optimization for cooling systemof vehicle were completed.Lastly, vehicle thermal balance test is done. In order to validate the credibility ofthe simulation, compared with the test results, the simulation results are in accordancewith the experimental ones, so it can be concluded that the simulation calculation iscorrect and reliable.