Theoretical study of DI diesel engine performance and pollutant emissions using comparable air-side and fuel-side oxygen addition

Zannis, TC; Pariotis, EG; Hountalas, DT; Rakopoulos, DC; Levendis, YA

dc.contributor.author	Zannis, TC	en
dc.contributor.author	Pariotis, EG	en
dc.contributor.author	Hountalas, DT	en
dc.contributor.author	Rakopoulos, DC	en
dc.contributor.author	Levendis, YA	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/123456789/18457
dc.subject	oxygenated fuel	en
dc.subject	oxygen-enriched air	en
dc.subject	diesel engine	en
dc.subject	pollutant 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	en
dc.subject.other	ENRICHMENT	en
dc.title	Theoretical study of DI diesel engine performance and pollutant emissions using comparable air-side and fuel-side oxygen addition	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.enconman.2007.07.007	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.enconman.2007.07.007	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The present work examines the effects of oxygen addition on diesel combustion parameters and pollutant emissions. Oxygen is added either by increasing the partial pressure of oxygen in the intake air or by oxygenating the fuel. This is a predominately computational study, where the effect of oxygen addition is addressed using a two-dimensional multi-zone model. The validity of model calculations was assessed against pertinent experimental data generated in this laboratory from a single cylinder DI diesel engine using neat diesel oil and oxygenated fuels. The comparison of the two techniques was conducted at comparable oxygen mole fractions (21-22.5%) in the fuel-air mixture (charge) of the combustion chamber. For all cases, engine torque was retained the same by adjusting fuelling rate. At fixed engine load, in-cylinder pressure, temperature, soot and NO concentration histories, which were calculated for a conventional diesel fuel, are compared with corresponding data, which were derived using either oxygenated fuels or oxygen-enhanced air. Results showed that both techniques produce an increase of cylinder pressure and reduction of soot compared to the normal diesel operation, with the fuel oxygenation being the most effective. However, both techniques increase NO, emissions, with the fuel oxygenation being more detrimental. Fuel-side oxygenation gave higher soot reductions for a given NO increase compared to air-side oxygen-enhancement. The higher sensitivity of soot reduction and NO, deterioration to fuel-side oxygen-addition is attributed to higher oxygen availability inside each combustion zone. Model computations revealed "linearity" between engine out pollutant emissions and oxygen content of the intake air. To the contrary, "non-linearity" was evident between emissions and oxygen content in oxygenated fuels. This indicates that engine performance characteristics and pollutant emissions are easier to predict when enriching the air rather than the fuel with oxygen, since in the latter case changes in performance and emissions are attributed not only to fuel oxygen content but also to fuel molecular structure and properties. (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.2007.07.007	en
dc.identifier.isi	ISI:000250910500025	en
dc.identifier.volume	48	en
dc.identifier.issue	11	en
dc.identifier.spage	2962	en
dc.identifier.epage	2970	en