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2領域モデルによるディーゼル燃焼解析 : 第2報,燃焼域空気過剰率の検討


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Title: 2領域モデルによるディーゼル燃焼解析 : 第2報,燃焼域空気過剰率の検討
Other Titles: Diesel Combustion Analysis by Two-Zone Model : 2nd Report, Examination of Excess Air Ratio in Burned Zone
Authors: 石田, 正弘 / 松村, 昇 / 植木, 弘信 / 陳, 之立
Authors (alternative): Ishida, Masahiro / Matsumura, Noboru / Ueki, Hironobu / Chen, Zhi-Li
Issue Date: 25-Jul-1994
Publisher: 日本機械学会
Citation: 日本機械学會論文集. B編 60(575) p.2592-2598, 1994
Abstract: The excess air ratio of the burned zone, Ad, which was estimated by two-zone model analysis, was compared with the excess air ratio of the modeled steady-state fuel spray and diffusion flame. There was little correlation between λ_d and the averaged excess air ratio in the cylinder λ_m, and λ_d was mainly dominated by the characteristics of fuel spray and ignition delay. The excess air ratio during the premixed combustion period minimally influenced upon the NO formation fraction if the premixed combustion fraction was less than 50%. The major factors of NO_x reduction were investigated using the two-zone model. As a result, it was made clear that a large NO_x reduction due to timing retard was mainly caused by both a decrease of combustion temperature and a large decrease in combustion pressure on the expansion stroke, and a small NO_x reduction with the decreased nozzle hole diameter was caused by a decrease of combustion pressure based on the decrease of the heat release rate in the 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/10069/6746
ISSN: 03875016
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/6746

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