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Dependence of premixed low-temperature diesel combustion on fuel ignitability and volatility

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Title: Dependence of premixed low-temperature diesel combustion on fuel ignitability and volatility
Authors: Li, Tie Browse this author
Moriwaki, Riichi Browse this author
Ogawa, Hideyuki Browse this author →KAKEN DB
Kakizaki, Ryuta Browse this author
Murase, Masato Browse this author
Keywords: fuels
low-temperature combustion (LTC)
diesel engines
cetane number
Issue Date: Feb-2012
Publisher: SAGE Publications
Journal Title: International Journal of Engine Research
Volume: 13
Issue: 1
Start Page: 14
End Page: 27
Publisher DOI: 10.1177/1468087411422852
Abstract: A comprehensive study of fuel property effects in internal combustion engines is required to enable fuel diversification as well as applications to advanced engines being developed for operation with a variety of combustion modes. The objective of this paper is to investigate the effects of fuel ignitability and volatility over a wide range on premixed low-temperature combustion (LTC) modes in diesel engines. Twenty three fuels were prepared from commercial gasoline, kerosene, and diesel as baseline fuels and with the addition of additives, to generate a cetane number (CN) range from 11 to 75. Experiments with a single cylinder diesel engine operated in moderately-advanced-injection LTC modes were conducted to evaluate these fuels. The combustion phasing is demonstrated to be a good indicator to estimate the in-cylinder peak pressure, exhaust gas emissions, and thermal efficiency in the LTC mode. Fuel ignitability affects the combustion phasing by changing the ignition delay. The predicted cetane number (PCN) based on fuel molecular structure analysis can be fitted to the ignition delays with a higher coefficient of determination than CN, suggesting a good potential as a fuel ignitability measure over a wide range. The stable operating load range in the smokeless LTC mode depends more on the actual ignition delay or PCN rather than CN. With fixed injection timing and intake oxygen concentration, O_[2in], only when PCN < 40, the load range can be expanded significantly to higher loads. With holding the combustion phasing at TDC and varying O_[2in], the NOx and smoke emissions become limitations of the load expansion for some fuels. The effects of fuel volatility on the characteristics of LTC are small compared to ignitability. Finally, the operational injection timing range and robustness of the LTC to fuel ignitability are examined, showing that the advantageous ignitability range becomes narrower, with fuel ignitability decreasing.
Rights: The final, definitive version of this article has been published in the Journal, International Journal of Engine Research, 13(1), 2012 of publication, © Institution of Mechanical Engineers, 2012 by SAGE Publications Ltd at the International Journal of Engine Research page: on SAGE Journals Online:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 李 鉄

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