Evaluation of various rich combustion strategies for HD-DI diesel engines

Hountalas, DT; Ofner, H; Maragiannis, G; Rakopoulos, DC

dc.contributor.author	Hountalas, DT	en
dc.contributor.author	Ofner, H	en
dc.contributor.author	Maragiannis, G	en
dc.contributor.author	Rakopoulos, DC	en
dc.date.accessioned	2014-03-01T01:26:19Z
dc.date.available	2014-03-01T01:26:19Z
dc.date.issued	2007	en
dc.identifier.issn	0143-3369	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18005
dc.subject	Adsorber	en
dc.subject	Diesel engine	en
dc.subject	NOx	en
dc.subject	Rich combustion	en
dc.subject	Simulation	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Transportation Science & Technology	en
dc.subject.other	Adsorber	en
dc.subject.other	Pollutant emissions	en
dc.subject.other	Storage capacity	en
dc.subject.other	Catalysts	en
dc.subject.other	Combustion chambers	en
dc.subject.other	Computer simulation	en
dc.subject.other	Fuel economy	en
dc.subject.other	Pollution	en
dc.subject.other	Soot	en
dc.subject.other	Diesel engines	en
dc.title	Evaluation of various rich combustion strategies for HD-DI diesel engines	en
heal.type	journalArticle	en
heal.identifier.primary	10.1504/IJVD.2007.013676	en
heal.identifier.secondary	http://dx.doi.org/10.1504/IJVD.2007.013676	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The diesel engine, because of its superior fuel economy compared with spark ignition engines, has attracted considerable attention. Significant improvement in their performance and engine emissions has been achieved. The use of various advanced internal measures has resulted in significant reduction of pollutant emissions inside the combustion chamber. Nevertheless, considering the increasingly restrictive 'engine-out' emission standards to be adopted, it appears that the use of air throttling systems is possibly inevitable in order to meet the future limits. This is because NOx and soot emissions are usually affected in the opposite way from the various internal measures. However, the use of conventional air throttling systems in DI diesel engines is not possible owing to the lean nature of diesel combustion, which does not permit the use of catalysts for controlling NOx emissions. Currently, alternative solutions are proposed focusing on the use of a selective catalytic reduction system, requiring a carefully controlled injection of urea or NOx traps (adsorbers) When the storage capacity of the trap is reached, during normal lean operation, the engine must switch to rich operation in order to produce the necessary reducing agents, that is, CO and H2, which release the stored NO, to react with CO in a catalyst to finally form N,. In this work, an extended computational investigation has been conducted to examine various strategies for achieving rich combustion in diesel engines. Rich diesel combustion has recently attracted attention for the regeneration of NOx traps. Rich combustion can be achieved using either internal or external measures, (fuel injection at the exhaust manifold). Rich operation is expected to have a negative impact on engine performance and emissions resulting in an increase of brake specific fuel consumption (bsfc), soot and exhaust gas temperature. For this reason, in this work, various strategies are examined for achieving rich combustion using internal measures, namely intake air throttling or/and waste gate operation, EGR and late post injection. The investigation was conducted on a heavy-duty DI diesel engine, using a phenomenological simulation code that is based on a multizone combustion model. Information is provided concerning the impact of the various rich strategies examined on engine performance and emissions. This enables us to estimate the most appropriate one. Using this information, we established a combination of strategies to achieve the lowest possible A value with acceptable overall fuel and soot penalties. Copyright © 2007 Inderscience Enterprises Ltd.	en
heal.publisher	INDERSCIENCE ENTERPRISES LTD	en
heal.journalName	International Journal of Vehicle Design	en
dc.identifier.doi	10.1504/IJVD.2007.013676	en
dc.identifier.isi	ISI:000247816100010	en
dc.identifier.volume	45	en
dc.identifier.issue	1-2	en
dc.identifier.spage	171	en
dc.identifier.epage	199	en