Experimental and computational investigation of temperature effects on soot mechanisms
Effects of initial ambient temperatures on combustion and soot emission characteristics of diesel fuel were investigated through experiment conducted in optical constant volume chamber and simulation using phenomenological soot model. There are four difference initial ambient temperatures a...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Serbian Chemical Society
2014-01-01
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| Series: | Journal of the Serbian Chemical Society |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2014/0352-51391300125B.pdf |
| Summary: | Effects of initial ambient temperatures on combustion and soot emission
characteristics of diesel fuel were investigated through experiment conducted
in optical constant volume chamber and simulation using phenomenological soot
model. There are four difference initial ambient temperatures adopted in our
research: 1000 K, 900 K, 800 K and 700 K. In order to obtain a better
prediction of soot behavior, phenomenological soot model was revised to take
into account the soot oxidation feedback on soot number density and good
agreement was observed in the comparison of soot measurement and prediction.
Results indicated that ignition delay prolonged with the decrease of initial
ambient temperature. The heat release rate demonstrated the transition from
mixing controlled combustion at high ambient temperature to premixed
combustion mode at low ambient temperature. At lower ambient temperature,
soot formation and oxidation mechanism were both suppressed. But finally soot
mass concentration reduced with decreasing initial ambient temperature.
Although the drop in ambient temperature did not cool the mean in-cylinder
temperature during the combustion, it did shrink the total area of local high
equivalence ratio, in which soot usually generated fast. At 700 K initial
ambient temperature, soot emissions were almost negligible, which indicates
that sootless combustion might be achieved at super low initial temperature
operation conditions. |
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| ISSN: | 0352-5139 1820-7421 |