Modelling the transient heat transfer in the ceramic combustion chamber walls of a low heat rejection diesel engine

Rakopoulos, CD; Mavropoulos, GC

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Mavropoulos, GC	en
dc.date.accessioned	2014-03-01T01:14:49Z
dc.date.available	2014-03-01T01:14:49Z
dc.date.issued	1999	en
dc.identifier.issn	0143-3369	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13236
dc.subject	diesel engine	en
dc.subject	low heat rejection	en
dc.subject	ceramic materials	en
dc.subject	transient response	en
dc.subject	finite elements	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Transportation Science & Technology	en
dc.subject.other	Combustion chambers	en
dc.subject.other	Finite element method	en
dc.subject.other	Heat transfer	en
dc.subject.other	Thermal effects	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Ceramic combustion chamber walls	en
dc.subject.other	Low heat rejection diesel engine	en
dc.subject.other	Thermal shock	en
dc.subject.other	Diesel engines	en
dc.title	Modelling the transient heat transfer in the ceramic combustion chamber walls of a low heat rejection diesel engine	en
heal.type	journalArticle	en
heal.identifier.primary	10.1504/IJVD.1999.001865	en
heal.identifier.secondary	http://dx.doi.org/10.1504/IJVD.1999.001865	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	A new hybrid finite-element thermostructural model is developed and applied for the investigation of the thermal effects of various insulation configurations on the combustion chamber surfaces of a DI (direct injection) diesel engine, under transient operating conditions. The model uses a comprehensive thermodynamic engine cycle simulation model in combination with a detailed structural analysis model, which allows the study of the effect of engine geometry and construction parameters on its performance. The separate representation of the various component subregions by the hybrid model makes possible the quantitative estimation of the effect of contact resistances on the amount of heat rejected to the combustion chamber walls. Connection between the resulting submodels is accomplished via the adequate use of the heat balance method. The model is applied for two of the most commonly used engine insulation configurations under transient operation (load increase), with the variation of the thermal characteristics of the fluids surrounding the combustion chamber simulated in detail. An engine transient event was revealed to consist of two different characteristic thermal stages, which are distinguished and analysed. The importance of the rate of a specific variation towards the development of sharp temperature gradients (thermal shock) inside the sensitive ceramic materials is clearly revealed. A satisfactory degree of agreement is found between theoretical predictions and experimental measurements at the initial and final stages of the transient variation, confirming the model's validity.	en
heal.publisher	Inderscience Enterprises Ltd, Geneve-15, Switzerland	en
heal.journalName	International Journal of Vehicle Design	en
dc.identifier.doi	10.1504/IJVD.1999.001865	en
dc.identifier.isi	ISI:000082883400002	en
dc.identifier.volume	22	en
dc.identifier.issue	3	en
dc.identifier.spage	195	en
dc.identifier.epage	215	en