Theoretical study of the effects of pilot fuel quantity and its injection timing on the performance and emissions of a dual fuel diesel engine

Papagiannakis, RG; Hountalas, DT; Rakopoulos, CD

dc.contributor.author	Papagiannakis, RG	en
dc.contributor.author	Hountalas, DT	en
dc.contributor.author	Rakopoulos, CD	en
dc.date.accessioned	2014-03-01T01:27:27Z
dc.date.available	2014-03-01T01:27:27Z
dc.date.issued	2007	en
dc.identifier.issn	0196-8904	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18458
dc.subject	dual fuel diesel engine	en
dc.subject	natural gas	en
dc.subject	pilot ignition	en
dc.subject	injection timing	en
dc.subject	combustion	en
dc.subject	emissions	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 PROCESSES	en
dc.subject.other	SIMULATION	en
dc.title	Theoretical study of the effects of pilot fuel quantity and its injection timing on the performance and emissions of a dual fuel diesel engine	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enconman.2007.07.003	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2007.07.003	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Various solutions have been proposed for improving the combustion process of conventional diesel engines and reducing the exhaust emissions without making serious modifications on the engine, one of which is the use of natural gas as a supplement for the conventional diesel fuel, the so called dual fuel natural gas diesel engines. The most common type of these is referred to as the pilot ignited natural gas diesel engine (PINGDE). Here, the primary fuel is natural gas that controls the engine power output, while the pilot diesel fuel injected near the end of the compression stroke auto-ignites and creates ignition sources for the surrounding gaseous fuel mixture to be burned. Previous research studies have shown that the main disadvantage of this dual fuel combustion is its negative impact on engine efficiency compared to the normal diesel operation, while carbon monoxide emissions are also increased. The pilot diesel fuel quantity and injection advance influence significantly the combustion mechanism. Then, in order to examine the effect of these two parameters on the performance and emissions, a comprehensive two-zone phenomenological model is employed and applied on a high-speed, pilot ignited, natural gas diesel engine located at the authors' laboratory. According to the results, the simultaneously increase of the pilot fuel quantity accompanied with an increase of its injection timing results to an improvement of the engine efficiency (increase) and of the emitted CO emissions (decrease) while it has a negative effect (increase) of NO 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.2007.07.003	en
dc.identifier.isi	ISI:000250910500024	en
dc.identifier.volume	48	en
dc.identifier.issue	11	en
dc.identifier.spage	2951	en
dc.identifier.epage	2961	en