The effect of fuel injection pressure and in cylinder temperature on igniton delay, combustion performance and emission
The mixture formation prior to the ignition process plays as a key element in the diesel combustion. The objective of this research was to help an understand of the effects of air fuel mixing process during the ignition delay period and initial heat release in combustion process that strongly...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2020
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/907/1/24p%20MD%20NORRIZAM%20MOHMAD%20JAAT.pdf http://eprints.uthm.edu.my/907/2/MD%20NORRIZAM%20MOHMAD%20JAAT%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/907/3/MD%20NORRIZAM%20MOHMAD%20JAAT%20WATERMARK.pdf |
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| Summary: | The mixture formation prior to the ignition process plays as a key element in the diesel
combustion. The objective of this research was to help an understand of the effects of
air fuel mixing process during the ignition delay period and initial heat release in
combustion process that strongly affects the exhaust emissions. This study investigated
effects of ambient temperature,Ti and injection pressure, Pinj on the heat release process
during ignition delay periods. Rapid compression machine (RCM) was used to
simulate actual phenomenon inside the combustion chamber. This study used of
5vol%, 10vol%, and 15vol% blending of palm oil methyl ester with a standard diesel
as fuels in diesel engines called as B5, B10, and B15 and standard diesel itself. The
injection pressures were varied from 80 MPa to 140 MPa while an ambient
temperature of RCM varied from 750 K to 950 K. For all tested fuels, the ignition
delay period decreased with the increase in ambient temperature and injection
pressure. The initial heat release becomes more delayed for lowering the ambient
temperatures and its peak was found to increase progressively and shorten ignition
delay period. Increased injection pressures make spray tip penetration longer and
promotes a greater amount of fuel-air mixing occurs during ignition delay which is
gives early rise of heat release rate. Higher injection rate was promoted both mixing
and atomization increase heat release rate as well as shorten ignition delay. The effects
of high injection and ambient temperature showed a reduction on emission, especially
HC, CO and CO2. Increased in injection pressure, leads to decrease in NOx emission
and due to superior air–fuel mixture resulting from increase in injection pressure, CO2,
CO and HC emission decreases. Higher blending ratio from B5 to B15 increases the
oxygen content, which makes the combustion more complete, thus, promotes the
reduction of emissions specifically for CO, CO2, and HC, but the NOx emissions
increase. |
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