THE STUDY OF DIFFERENT SIZES OF DIY MODEL COMBUSTION CHAMBER

Abstract

Achieving perfect combustion plays a vital role in the operation of marine diesel engines, as it directly impacts the engine's efficiency, performance, and emissions. Perfect combustion entails the complete burning of fuel, resulting in the production of carbon dioxide and water vapor. Optimization of engine performance, enhance fuel economy, and reduce emissions can be attained by adjusting the fuel injection system in response to pressure variations. To maximize performance and efficiency, careful attention must be given to the design and maintenance of both the combustion chamber and the fuel injection system in a diesel engine. The project aimed to illustrate the actual working pressure in the combustion chamber of an operational direct injection diesel engine. An injector tester was employed to showcase diverse pressure buildups on DIY model combustion chambers of varying sizes. A slowmotion camera was utilized to provide a detailed observation of the processes involved in spray formation and dispersion. The slowmotion footage served as a valuable visual aid, facilitating an understanding of how alterations in pressure and volume affect the atomization of fuel and the subsequent spray pattern. Mathematical approaches were employed to determine the chamber pressure buildup and the spray cone angle. An increase in pressure from 16.71Pa to 36.61Pa within the 150ml DIY model chamber resulted in a wider spray angle, whereas a decrease in pressure from 17.29Pa to 8.07Pa within the 200ml DIY model chamber led to a narrower spray angle.