Assessing the effect of mass transfer on the formation of HC and CO emissions in HCCI engines, using a multi-zone model

Komninos, NP

dc.contributor.author	Komninos, NP	en
dc.date.accessioned	2014-03-01T01:29:53Z
dc.date.available	2014-03-01T01:29:53Z
dc.date.issued	2009	en
dc.identifier.issn	0196-8904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19393
dc.subject	HCCI	en
dc.subject	Multi-zone model	en
dc.subject	Mass transfer	en
dc.subject	Emissions formation	en
dc.subject	Hydrocarbons	en
dc.subject	CO	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Mechanics	en
dc.subject.classification	Physics, Nuclear	en
dc.subject.other	COMBUSTION	en
dc.title	Assessing the effect of mass transfer on the formation of HC and CO emissions in HCCI engines, using a multi-zone model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enconman.2009.01.026	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2009.01.026	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The focus of the present study is to assess the effect of mass transfer on the formation of unburned HC and CO emissions in HCCI engines. A multi-zone model was modified and used for this purpose. The new feature of the multi-zone model is its ability to switch between two distinct simulation modes, i.e. either including or excluding mass transfer between zones. The switch between modes occurs at a user-defined point in the engine closed cycle. Apart from mass transfer, the two modes use identical sub-models for the heat transfer between zones and to the cylinder wall and for combustion simulation, which is modeled using a reduced set of chemical reactions coupled with a chemical kinetics solver. Using the modified multi-zone model, four cases were simulated and compared: one including mass transfer throughout the closed cycle, and three cases whereby mass transfer is neglected after the initiation of the 1st or 2nd heat release or after the completion of main heat release. The simulation results reveal that mass transfer affects the HC and CO accumulated at the colder regions during combustion and governs the HC partial oxidation and CO production during expansion. For the operating conditions studied, neglecting mass transfer during combustion results to an underprediction of HC by as much as 50% and of CO by 45% relative to the case where mass transfer is considered for. Omitting mass transfer only during expansion, results to an overestimation of HC by 9% and to an underestimation of CO by 26%. (C) 2009 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	ENERGY CONVERSION AND MANAGEMENT	en
dc.identifier.doi	10.1016/j.enconman.2009.01.026	en
dc.identifier.isi	ISI:000265370600006	en
dc.identifier.volume	50	en
dc.identifier.issue	5	en
dc.identifier.spage	1192	en
dc.identifier.epage	1201	en