Development and application of multi-zone model for combustion and pollutants formation in direct injection diesel engine running with vegetable oil or its bio-diesel

Rakopoulos, CD; Antonopoulos, KA; Rakopoulos, DC

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Antonopoulos, KA	en
dc.contributor.author	Rakopoulos, DC	en
dc.date.accessioned	2014-03-01T01:26:07Z
dc.date.available	2014-03-01T01:26:07Z
dc.date.issued	2007	en
dc.identifier.issn	0196-8904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17927
dc.subject	multi-zone model	en
dc.subject	diesel engine	en
dc.subject	combustion	en
dc.subject	pollutants	en
dc.subject	cottonseed oil	en
dc.subject	bio-diesel	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	COMPARATIVE PERFORMANCE	en
dc.subject.other	FORTRAN PROGRAM	en
dc.subject.other	BIODIESEL FUELS	en
dc.subject.other	BULK MODULUS	en
dc.subject.other	EMISSIONS	en
dc.subject.other	BLENDS	en
dc.subject.other	OPERATION	en
dc.subject.other	PRESSURE	en
dc.subject.other	DI	en
dc.title	Development and application of multi-zone model for combustion and pollutants formation in direct injection diesel engine running with vegetable oil or its bio-diesel	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enconman.2007.01.026	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2007.01.026	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	A multi-zone model for calculation of the closed cycle of a direct injection (DI) Diesel engine is presented and applied for the interesting case of its operation with vegetable oil (cottonseed) or its derived bio-diesel (methyl ester) as fuels, which recently are considered as promising alternatives (bio-fuels) to petroleum distillates. Although there are many experimental studies, there is an apparent scarcity of theoretical models scrutinizing the formation mechanisms of combustion generated emissions when using these fuels. The model is two dimensional, multi-zone with the issuing jets (from the nozzle) divided into several discrete volumes, called 'zones', formed along the direction of the fuel injection and across it. The model follows each zone, with its own time history, as the spray penetrates into the swirling air environment (forming the non-burning zone) of the combustion chamber, before and after wall impingement. Droplet evaporation and jet mixing models are used to determine the amount of fuel and entrained air in each zone available for combustion. The mass, energy and state equations are applied in each zone to yield local temperatures and cylinder pressure histories. The concentrations of the various constituents are calculated by adopting a chemical equilibrium scheme for the C-H-O-N system of 11 species considered, together with the chemical rate equations for the calculation of nitric oxide (NO). A model for evaluation of soot formation and oxidation rates is included. The results from the relevant computer program for the in cylinder pressure, exhaust nitric oxide concentration (NO) and soot density are compared favorably with the corresponding measurements from an experimental investigation conducted on a fully automated test bed, standard 'Hydra', DI Diesel engine installed at the authors' laboratory. Iso-contour plots of equivalence ratio, temperature, NO and soot inside the combustion chamber at various instants of time when using these fuels against Diesel fuel (baseline fuel) shed light on the mechanisms underlying the combustion and pollutants formation and reveal how the widely differing properties of these fuels, against the normal Diesel fuel, affect greatly the spray formation, combustion mechanism and the related emissions. (c) 2007 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.2007.01.026	en
dc.identifier.isi	ISI:000246921800001	en
dc.identifier.volume	48	en
dc.identifier.issue	7	en
dc.identifier.spage	1881	en
dc.identifier.epage	1901	en