Mechanism of thermal efficiency improvement in twin shaped semi-premixed diesel combustion

Inaba, Kazuki; Zhang, Yanhe; Kobashi, Yoshimitsu; Shibata, Gen; Ogawa, Hideyuki

Mechanism of thermal efficiency improvement in twin shaped semi-premixed diesel combustion

Inaba, Kazuki; Zhang, Yanhe; Kobashi, Yoshimitsu et al.

International journal of engine research, 2022, 23(7), 1237-1247

Permalink : https://hdl.handle.net/2115/85362

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/85362
タイトル	Mechanism of thermal efficiency improvement in twin shaped semi-premixed diesel combustion
著者	Inaba, Kazuki ; Zhang, Yanhe ; Kobashi, Yoshimitsu ; Shibata, Gen ; Ogawa, Hideyuki
著者名 Inaba, Kazuki
著者名 Zhang, Yanhe
e-Rad_Researcher 80469072 著者名 Kobashi, Yoshimitsu
著者名 Shibata, Gen
e-Rad_Researcher 40185509 著者名 Ogawa, Hideyuki
言語	英語
キーワード	Diesel engine
	thermal efficiency
	energy balance
	exhaust gas emissions
	heat release rate
	cooling loss
	multi-stage fuel injection
	premixed diesel combustion
発行日	2022-07-01
出版者	SAGE Publications
収録物名	International journal of engine research
巻(号)	23(7)
ページ	1237-1247
抄録	Improvements of the thermal efficiency in twin shaped semi-premixed diesel combustion mode with premixed combustion in the primary stage and spray diffusive combustion in the secondary stage with multi-stage fuel injection were investigated with experiments and 3D-CFD analysis. For a better understanding of the advantages of this combustion mode, the results were compared with conventional diesel combustion modes, mainly consisting of diffusive combustion. The semi-premixed mode has a higher thermal efficiency than the conventional mode at both the low and medium load conditions examined here. The heat release in the semi-premixed mode is more concentrated at the top dead center, resulting in a significant reduction in the exhaust loss. The increase in the cooling loss is suppressed to a level similar to the conventional mode. In the conventional mode the rate of heat release becomes more rapid and the combustion noise increases with advances in the combustion phase as the premixed combustion with pilot and pre injections and the diffusive combustion with the main combustion occurs simultaneously. In the semi-premixed mode, the premixed combustion with pilot and primary injections and the diffusive combustion with the secondary injection occurs separately in different phases, maintaining a gentler heat release with advances in the combustion phase. The mechanism of the cooling loss suppression with the semi-premixed mode at low load was investigated with 3D-CFD. In the semi-premixed mode, there is a reduction in the gas flow and quantity of the combustion gas near the piston wall due to the suppression of spray penetration and splitting of the injection, resulting in a smaller heat flux.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Inaba K, Zhang Y, Kobashi Y, Shibata G, Ogawa H., Mechanism of thermal efficiency improvement in twin shaped semi-premixed diesel combustion, International journal of engine research 2022;23(7):1237-1247. Copyright © 2022 Institution of Mechanical Engineers. DOI: 10.1177/14680874211026429.
PISSN	1468-0874
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1177/14680874211026429