Computational and experimental determination of heat flux rates in a di motored diesel engine by processing of the measured pressure diagram

Hountalas, DT

dc.contributor.author	Hountalas, DT	en
dc.date.accessioned	2014-03-01T01:45:54Z
dc.date.available	2014-03-01T01:45:54Z
dc.date.issued	1997	en
dc.identifier.issn	02286203	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24785
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-5844399634&partnerID=40&md5=bdc4b48cd8863e009ed3b153af8aef89	en
dc.subject	Computational	en
dc.subject	Diesel engine	en
dc.subject	Heat flux	en
dc.subject	Motored	en
dc.title	Computational and experimental determination of heat flux rates in a di motored diesel engine by processing of the measured pressure diagram	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	Heat transfer to the engine cylinder is essential for internal combustion, engine simulation, especially under motored conditions. If the heat loss rate is correctly estimated, it is then easy to determine if a low maximum compression pressure is due to increased blowby or not. This paper proposes a method to determine the heat flux rate to the combustion chamber walls of a motored DI diesel engine and evaluate the heat transfer model used. The method is based on processing the measured pressure diagram Li the engine cylinder using a time step equivalent to 0.15° CA. The measured pressure diagram is a P-t diagram, and thus the TDC (top dead centre) of the engine must be determined precisely in order to be converted to a P-V diagram. The TDC is measured using a magnetic pickup device mounted on the engine flywheel and is also determined, in cases where this is impossible, using a modified version of a thermodynamic method developed by the author. The heat flux determination method is applied on a modified Ricardo E-6 engine in the author's laboratory over a range of engine speeds under cold and warm conditions. There is very good coincidence between the measured and calculated heat flux rates at all speeds examined, revealing the validity of the heat transfer model used. The results are promising and compare very well with experimental results published in the literature.	en
heal.journalName	International Journal of Modelling and Simulation	en
dc.identifier.volume	17	en
dc.identifier.issue	1	en
dc.identifier.spage	45	en
dc.identifier.epage	51	en