Due to increased concern about emission,
every source responsible for it should be eliminated or its
influence reduced. In this respect the film formation over the
wall region of a engine cylinder is analysed to understand the
emission under adiabatic flow condition. The film on the wall
starts forming when the air fuel mixture reaches the saturation
temperature. In this paper a pent roof four valve Siamese
intake port gasoline engine is selected and investigated under
motoring condition accounting for cold start principle through
single point Port Fuel Injection(PFI). About 46 mg of liquid
fuel is injected through two injectors which are placed at the
end of divided intake port of Siamese type. The injectors are
angled about 20o w.r.t. centre vertical plane of Siamese intake
port and 60o w.r.t. Horizontal plane of fire deck zone. The
thickness of film formed by fuel droplets from the injector is
gradually increased around the wall regions of the engine
cylinder. When PFI system is used, the liquid film formation
over the region of valve stem, valve face, intake port, dome,
cylinder liner and piston top were more pronounced than the
direct injection. The accumulation of film mass is more over
the region of cylinder dome and port while compared to other
regions inside and outside the cylinder. The cylinder dome
region and port region are accounted about 6 mg and 12 mg
respectively of film mass accumulation. From the total
percentage of fuel injection, only 33 percentage of liquid fuel
is evaporated and ready to mix with air to form charge for
combustion. This shows that there is more chance of miss fire
during cold start due to the influences of liquid film. The port
region has 0.1mm thickness of film compared with other
regions. It affects the quality of air fuel mixture for the next
cycle and tends to affect combustion stability. Also it leads to
soot formation inside the cylinder
Real Time Impact Factor:
Pending
Author Name: P. Ramesh and E. James Gunasekaran
URL: View PDF
Keywords: Port Fuel Injection, Cylinder Dome, Port Region, Film Thickness, Film Mass, Injector and Siamese Intake Port.
ISSN: 2250-1096
EISSN: 2277-5056
EOI/DOI: 10.9756/BIJIEMS.9032
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