Research of Spark Ignition Engine and Internal Mixture Formation Using Single-Zone, Two-Zone and Three-Zone Calculation Model of It Working Process

Thermodynamic models based on the volume balance method for calculating the working process of an engine with spark ignition and internal mixture formation are presented. The single-zone model makes it possible to determine the pressure and average temperature of gases in the engine cylinder during the working process. The two-zone combustion model takes into account the change in the volume of the exhaust gases zone and the air-fuel mixture zone. The model makes it possible to determine the pressure of gases in the cylinder and the temperature in the zones under consideration when the air-fuel mixture is distributed over the entire above-piston volume at the moment of ignition. The three-zone combustion model takes into account the change in the volume of the exhaust gases zone, air-fuel mixture zones and air zones when organizing the stratification of the air-fuel charge, allows you to determine the gas pressure in the cylinder and the temperature in the zones under consideration. The results of theoretical studies obtained by single-zone, two-zone and three-zone thermodynamic models of combustion on a two-stroke engine 1D8.2/8.7 with direct injection of gasoline into the cylinder are compared with experimental data. The results of experimental studies are based on indicator diagrams of gas pressure in the engine cylinder in the load characteristic modes at n = 3,000 rpm in terms of the crankshaft rotation angle. The use of a single-zone and two-zone combustion model is preferably used in high load modes, and a three-zone combustion model is used in partial load modes, which corresponds to the smallest discrepancy between the values of theoretical and experimental indicator diagrams. The results obtained in the work allow us to expand our understanding of the use of the volume balance method for calculating the working process, taking into account the peculiarities of the organization and flow air-fuel mixture.