Effect of Injection Pressures on Emissions of Direct Injection Diesel Engine By Using CFD Simulation

Abstract

Internal combustion engines, now a days is the best available reliable source of power for all domestic, large scale industrial and transportation applications. The major issue arises at the efficiency of these engines. The major pollutants are Un Burned Hydro Carbons (UBHC), and Oxides of Nitrogen (Nox) .These are formed due to incomplete combustion of the fuel in combustion chamber of diesel engine. One of the important factors which influence the performance and emission of diesel engine is fuel injection pressure. An experimental study was performed on a light duty direct injection diesel engine at 150 bar, 200 bar and 250 bar injection pressure to study its effect on performance and emission These emissions can be controlled by different techniques like EGR, changing the injection pressure of fuel into the combustion chamber etc., It is a well known fact that as the injection pressure of fuel increases, the mass flow rate of fuel will vary for proper mixing of fuel and air in the combustion chamber. In the present work, it is proposed to investigate the effect of variations in injection pressure on emissions and for this STAR-CD will be used as a tool. To aid the setup of these calculations, visualization and interpretation of results, CD - Adapco has developed a pre and post- processor environment, es-ice which is a special tool in STAR-CD solver which will be used for this analysis. The performance and emission characteristics were presented graphically and concluded that they were found better at the fuel injection pressure 200 bar for the light duty engine.