Three-Dimensional Numerical Analysis Of Spray And Combustion Process For The Swirl Chamber Diesel Engine With Supercharging

The swirl chamber diesel engine works with smooth operation, low emissions andlow noise, through the supercharger we can not only improve the power but also can usethe advantages of low emission. In order to guide the matching optimization of the swirlchamber diesel engine after supercharging, we can use the three-dimensional transientnumerical simulation to analyze the spray and combustion process. This paper use theICEM software to mesh the combustion chamber of the R185K swirl chamber dieselengine, and use KIVA to analyze the spray, air-fuel mixture and combustion process in thecombustion chamber. By analyzing the spray and combustion process in the combustionchamber, we point out the weakness of the combustion structure after the supercharger andmake some optimization.At the rated power, we analyze the transient process of the fuel trajectory and studythe effect of the starting hole, connecting channel, then we study the process of the flamepropagation and bring the second cyclone on the top of the piston. Based on these studies,we discuss how the insert structure parameter (under different angle and sectional area ofthe insert) and piston pit work upon the diesel performance, the temperature field and theconcentration field. The problem of the high exhaust temperature, the excessive dischargeand the high fuel consumption after booster can be solved by optimizing the combustionchamber structure.Through the3D transient numerical simulation of the spray and combustion processcan better reflect the effect of the combustion structure which can help us to make thestructure optimization of the R185K swirl chamber diesel engine after supercharging.