Performance Enhancement of A Single Cylinder Diesel Engine Through Optimization of Piston Combustion Bowl Geometry

The fuel consumption in the world is increasing at alarming rate as well as fossil fuels prices are increasing day by day and they will deplete within few decades. Hence the efficient combustion design is a key factor to current research and development of I.C engine. The piston bowl geometry, nozzle position and spray behaviour plays a predominant role in the engine performance operated with diesel. The most important role of Compression Ignition (CI) engine combustion chamber is to enhance the fuel-air mixing rate (swirl) in short possible time. The turbulence can be guide by the shape of the combustion chamber hence there is necessity to study the combustion chamber geometry in detail. The engine design with re-entrant cavity with central pip produces longer spray volumes, wider spray spreading and also introducing bottom comer radius helps to disperse the fuel. Re-entrant combustion chamber (TRCC) gives better fuel economy, lower hydrocarbons (HC), smoke, carbon monoxide (CO), greater brake thermal efficiency (BTE) and maximum cylinder pressure it is attributed to higher in turbulence, swirl, hotter surface of the re-entrant chamber and availability of oxygen with diesel. The double dish combustion chamber and chamber with the bump ring increases the kinetic energy, air-fuel mixing rate than that of conventional combustion chamber.