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This paper presents a method and its procedure for calculating thc mixing of fuel spray and air and the combustion process of the direct injection diesel. In the calculation of the spray mixing model the spray tip penetration, the spray geometry, the air entrainment, the wall effect etc. are discussed and the method of calculation is presented. The two-zone model is adopted in calculation of combustion process. That is, the combustion chamber is divided into an air zone and a combustion zone. The affecting factors about the experemental constants of the fuel preparation and burning rates have been discussed and a simple method to determine the experemental constant by the data of the actual burning rate is gained. It gives the energy and mass equations and the method to solve. At the same time a new method to select the initial conditions is given and the emission NO is estimated. The heat release rates calculated are compared with the actual ones and the agreement is excellent.
This paper presents a method and its procedure for calculating thc mixing of fuel spray and air and the combustion process of the direct injection diesel. In the calculation of the spray mixing model the spray tip penetration, the spray geometry, the air entrainment, the wall effect is discussed and the method of calculating is presented. The two-zone model is adopted in calculation of combustion process. That is, the combustion chamber is divided into an air zone and a combustion zone. The affecting factors about the expemental constants of the fuel preparation and burning rates have been discussed and a simple method to determine the experemental constant by the data of the actual burning rate is gained. It gives the energy and mass equations and the method to solve. to select the initial conditions is given and the emission NO is estimated. The heat release rates are compared with the actual ones and the agreement is exceligible llent.