Components heat transfer studies in a low heat rejection di diesel engine using a hybrid thermostructural finite element model

Rakopoulos, CD; Mavropoulos, GC

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Mavropoulos, GC	en
dc.date.accessioned	2014-03-01T01:13:38Z
dc.date.available	2014-03-01T01:13:38Z
dc.date.issued	1998	en
dc.identifier.issn	1359-4311	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12626
dc.subject	Diesel engine	en
dc.subject	Finite elements	en
dc.subject	Hybrid thermostructural model	en
dc.subject	Low heat rejection	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Combustion chambers	en
dc.subject.other	Finite element method	en
dc.subject.other	Fuel injection	en
dc.subject.other	Heat flux	en
dc.subject.other	Iterative methods	en
dc.subject.other	Mathematical models	en
dc.subject.other	Silicon nitride	en
dc.subject.other	Sprayed coatings	en
dc.subject.other	Temperature distribution	en
dc.subject.other	Thermal insulating materials	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Zirconia	en
dc.subject.other	Direct injection diesel engines	en
dc.subject.other	Engine insulation	en
dc.subject.other	Heat balance method	en
dc.subject.other	Diesel engines	en
dc.title	Components heat transfer studies in a low heat rejection di diesel engine using a hybrid thermostructural finite element model	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S1359-4311(97)00055-0	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S1359-4311(97)00055-0	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	The development of a hybrid three-dimensional finite element thermostructural model is presented in this work, which is used to study the behaviour of various combustion chamber insulation configurations of a four-stroke, direct injection (DI), diesel engine on its performance, components temperatures, and heat fluxes under various steady operating conditions. The model incorporates a comprehensive thermodynamic engine cycle simulation model in combination with a detailed structural analysis model. Separate representation of the various subregions of each component, effected by the hybrid model, makes it possible for the quantitative estimation of the effect of contact resistances and included air gaps on the amount of heat rejected to the combustion chamber walls. Connection between the resulting finite element submodels at the interface of any two subregions is accomplished through appropriate use of the heat balance method. For this purpose, an iterative procedure is developed, which is capable of overcoming numerical instabilities occuring during convergence even for the most difficult case of the three-dimensional finite element analysis. The model is applied for two of the most commonly used engine insulation configurations, i.e. plasma sprayed zirconia and silicon nitride monolithic designs. The complex heat flow paths through the various combustion chamber components are analysed and the corresponding temperature distributions are presented. A satisfactory degree of agreement is found between theoretical predictions and experimental measurements for the uninsulated engine, thus confirming the model's validity. Furthermore, the uninsulated engine data case (baseline configuration) forms a sound basis against which the corresponding performance of the two engine insulation cases can be compared and assessed. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Applied Thermal Engineering	en
dc.identifier.doi	10.1016/S1359-4311(97)00055-0	en
dc.identifier.isi	ISI:000072428000008	en
dc.identifier.volume	18	en
dc.identifier.issue	5	en
dc.identifier.spage	301	en
dc.identifier.epage	316	en