Abstract:
Perfect combustion is a crucial process in marine diesel engines since it
directly influences the engine's performance, efficiency, and emissions. In
perfect combustion, the fuel is burned completely, and the resulting gases are
carbon dioxide and water vapor. Adjusting the fuel injection system in response
to pressure variations can optimise engine performance, increase fuel
economy, and reduce emissions. In order to achieve maximum performance
and efficiency, significant consideration must be taken to the design and
maintenance of both the fuel injection system and the combustion chamber of
a diesel engine. Thus, this project tries to illustrate the actual working pressure
in the combustion chamber of an operating direct injection diesel engine. In
this project, an injector tester is used to demonstrate different pressure
buildups on DIY model combustion chambers of various sizes. The use of a
slow-motion camera allowed for a detailed observation of the spray formation
and dispersion processes. The slow-motion footage provided a valuable visual
aid in understanding how changes in pressure and volume influence the fuel's
atomization and subsequent spray pattern. Mathematical approaches were
used to find the chamber pressure build up 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
