CFD modeling and experimental study of combustion and nitric oxide emissions in hydrogen-fueled spark-ignition engine operating in a very wide range of EGR rates

Kosmadakis, GM; Rakopoulos, CD; Demuynck, J; De Paepe, M; Verhelst, S

dc.contributor.author	Kosmadakis, GM	en
dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Demuynck, J	en
dc.contributor.author	De Paepe, M	en
dc.contributor.author	Verhelst, S	en
dc.date.accessioned	2014-03-01T02:08:22Z
dc.date.available	2014-03-01T02:08:22Z
dc.date.issued	2012	en
dc.identifier.issn	03603199	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29644
dc.subject	Combustion	en
dc.subject	EGR	en
dc.subject	Hydrogen	en
dc.subject	NO emissions	en
dc.subject	Spark-ignition engine	en
dc.subject.other	CFD codes	en
dc.subject.other	CFD modeling	en
dc.subject.other	Combustion phenomena	en
dc.subject.other	Combustion pro-cess	en
dc.subject.other	Computational results	en
dc.subject.other	Crank angle	en
dc.subject.other	EGR	en
dc.subject.other	Engine load	en
dc.subject.other	Experimental studies	en
dc.subject.other	External EGR	en
dc.subject.other	Indicated efficiency	en
dc.subject.other	Laminar flame speed	en
dc.subject.other	Lean mixtures	en
dc.subject.other	Measured data	en
dc.subject.other	Nitric oxide emissions	en
dc.subject.other	Nitrogen oxides emission	en
dc.subject.other	NO emissions	en
dc.subject.other	Operating condition	en
dc.subject.other	Real applications	en
dc.subject.other	Residual gas	en
dc.subject.other	Test case	en
dc.subject.other	Air engines	en
dc.subject.other	Combustion	en
dc.subject.other	Diesel engines	en
dc.subject.other	Electric sparks	en
dc.subject.other	Engines	en
dc.subject.other	Hydrogen	en
dc.subject.other	Internal combustion engines	en
dc.subject.other	Nitric oxide	en
dc.subject.other	Nitrogen oxides	en
dc.subject.other	Air pollution control	en
dc.title	CFD modeling and experimental study of combustion and nitric oxide emissions in hydrogen-fueled spark-ignition engine operating in a very wide range of EGR rates	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijhydene.2012.04.067	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijhydene.2012.04.067	en
heal.publicationDate	2012	en
heal.abstract	In the current work, the variation of EGR rates is investigated in a hydrogen-fueled, spark-ignition engine. This technique is followed in order to control the engine load and decrease the exhaust nitrogen oxides emissions. The external EGR is varied in the very wide range of 12% up to 47% (by mass), where in each test case the in-cylinder mixture is stoichiometric, diluted with the appropriate EGR rate. The operation of this engine is explored using measured data with the aid of a validated CFD code. Moreover, a new residual gas term existing in the expression of the hydrogen laminar flame speed, which has been derived from a one-dimensional chemical kinetics code, is tested in a real application for appraising its capabilities. The investigation conducted provides insight on the performance and indicated efficiency of the engine, the combustion processes, and the emissions of nitrogen oxides. More precisely, an experimental study has been deployed with the aim to identify the characteristics of such a technique, using very high EGR rates, focusing on the combustion phenomena. At the same time, the CFD results are compared with the corresponding measured ones, in order to evaluate the CFD code under such non-conventional operating conditions and to test a recent expression for the residual gas term included in the hydrogen laminar flame speed expression. It is revealed that the combustion takes place in few degrees of crank angle, especially at high engine loads (low EGR rates), whereas the exhaust nitrogen oxides emissions are significantly decreased in comparison to the use of lean mixtures for controlling the engine load. Additionally, the recent expression of the residual gas term, which has been tested and incorporated in the CFD code, seems to be adequate for the calculation of combustion phenomena in highly diluted, with EGR, hydrogen-fueled spark-ignition engines, as for every EGR rate tested (even for the higher ones) the computational results are compared in good terms with the measured data. © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.	en
heal.journalName	International Journal of Hydrogen Energy	en
dc.identifier.doi	10.1016/j.ijhydene.2012.04.067	en
dc.identifier.volume	37	en
dc.identifier.issue	14	en
dc.identifier.spage	10917	en
dc.identifier.epage	10934	en