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Diesel Combustion Analysis Based on Two-Zone Model : Examination of Excess Air Ratio in Burned Zone

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Title: Diesel Combustion Analysis Based on Two-Zone Model : Examination of Excess Air Ratio in Burned Zone
Authors: Ishida, Masahiro / Ueki, Hironobu / Matsumura, Noboru / Chen, Zhi-Li
Issue Date: 15-Aug-1996
Publisher: 社団法人日本機械学会
Citation: JSME international journal. Ser. B, Fluids and thermal engineering. 1996, 39(3), p.632-639
Abstract: The burned zone excess air ratio λ_d in the diffusion combustion process was analyzed using the two-zone model, and it was compared with the excess air ratio λ_f estimated using a steady diffusion flame model of the fuel spray. It is found that λ_d is dependent on the fuel spray penetration and ignition delay. If the premixed combustion fraction is less than 50%, the NO formation is minimally influenced by the excess air ratio during premixed combustion and is dependent on the excess air ratio λ_d which determines the maximum temperature during diffusion combustion. It is clarified by analysis of the two-zone model that the large reduction in NO_x due to timing retard is mainly caused by decreases in both combustion temperature and combustion pressure, and the small reduction in NO_x occurring when the nozzle-hole diameter is decreased, is due to a small decrease in combustion pressure resulting from a decrease in the heat release rate during premixed combustion.
Keywords: Diesel Engine / Combustion Analysis / Two-Zone Model / Diffusion Flame Model / Excess Air Ratio / NO Formation / NO_x Reduction Factor
URI: http://hdl.handle.net/10069/16786
ISSN: 13408054
Relational Links: http://ci.nii.ac.jp/naid/110002981325/
Rights: 社団法人日本機械学会 / 本文データは学協会の許諾に基づきCiNiiから複製したものである
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/16786

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