MATHEMATICAL MODELING AND EVALUATION OF FUEL INJECTION PRESSURE EFFECTS ON THE PERFORMANCE AND EMISSIONS OF GASOLINE DIRECT INJECTION ENGINE

Many parameters affect the performance of the gasoline direct injection (GDI) engine. Among these parameters, the fuel injection pressure plays a significant role in fuel supply and combustion quality. The present study aims to estimate how a GDI engine's performance and emissions are affected by the injection pressure with other parameters and help to determine the optimal injection pressure for efficient GDI engine operation. Thermodynamic mathematical modelling has been created utilizing MATLAB software. The thermodynamics first law, energy equation, conservation of mass, state equation, and mass fraction burned were all used to create the software program. Pressures used for fuel injection ranged from 5 to 45 MPa. According to the findings, nozzle injection pressure variations considerably impact the GDI engine's output and emission. It was shown that engine power, heat transfer, cylinder pressure, and temperature increased by injection pressure and maximum value with injection pressure 45 MPa. So, fuel injection systems must be designed to withstand high pressures to benefit from high-pressure fuel injection as much as possible. When fuel injection pressure variation with versus engine speed and nozzle holes number. Maximum engine power per cycle obtained when injection pressure 45 MPa and 3000 rpm with eight holes number. Carbon monoxide CO and Nitrogen monoxide NO emissions were found to be lowest for injection pressure 5 MPa.