Gaseous fuels, such as hydrogen and natural gas, are utilized in internal combustion engines for spark-ignition operation. To improve thermal efficiency and to ensure control at good heat-release rates, combustion systems with direct-injection and spontaneous-ignition operation may be preferable. The main objective of this research was to provide fundamental data for the ignition and combustion of hydrogen, natural gas, and methane. Experiments were conducted in a constant-volume combustion vessel to investigate the effects of ambient temperature on ignition delay and combustion characteristics for various injector and ambient conditions. Experimental results showed that all gaseous fuels exhibited similar ignition-delay trends: ignition delay increased as ambient temperature decreased. Among these fuels, hydrogen jets exhibited much shorter than natural gas and methane jets at the same and could be ignited at a lower temperature, . A shorter ignition delay of hydrogen may be attained by controlling the mixture formation by lowering the injection pressure , enlarging the nozzle-hole diameter , increasing the ambient pressure , and increasing the oxygen mole fraction . In contrast, the methane jet exhibited the longest over the whole range of and suffered from misfiring at a higher of 910 K. For natural gas, ignition delay was observed to be shorter than that for methane, owing to a small amount of butane with good ignitability. More specifically, the ignition delay of natural gas differed slightly when and varied but changed drastically when and decreased. Based on these data, the feasibility of gaseous fuels for compression-ignition engines is discussed from the viewpoint of mixture formation and chemical reaction.
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April 2010
Research Papers
Ignition Delay and Combustion Characteristics of Gaseous Fuel Jets
Dung Ngoc Nguyen,
Dung Ngoc Nguyen
Graduate School of Energy Science,
e-mail: dungnn2@elan.energy.kyoto-u.ac.jp
Kyoto University
, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
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Hiroaki Ishida,
Hiroaki Ishida
Graduate School of Energy Science,
Kyoto University
, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
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Masahiro Shioji
Masahiro Shioji
Graduate School of Energy Science,
Kyoto University
, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
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Dung Ngoc Nguyen
Graduate School of Energy Science,
Kyoto University
, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japane-mail: dungnn2@elan.energy.kyoto-u.ac.jp
Hiroaki Ishida
Graduate School of Energy Science,
Kyoto University
, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan
Masahiro Shioji
Graduate School of Energy Science,
Kyoto University
, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, JapanJ. Eng. Gas Turbines Power. Apr 2010, 132(4): 042804 (8 pages)
Published Online: January 27, 2010
Article history
Received:
April 8, 2009
Revised:
July 24, 2009
Online:
January 27, 2010
Published:
January 27, 2010
Citation
Nguyen, D. N., Ishida, H., and Shioji, M. (January 27, 2010). "Ignition Delay and Combustion Characteristics of Gaseous Fuel Jets." ASME. J. Eng. Gas Turbines Power. April 2010; 132(4): 042804. https://doi.org/10.1115/1.4000115
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