Experimental and theoretical study of the short term response temperature transients in the cylinder walls of a diesel engine at various operating conditions

Rakopoulos, CD; Rakopoulos, DC; Mavropoulos, GC; Giakoumis, EG

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Rakopoulos, DC	en
dc.contributor.author	Mavropoulos, GC	en
dc.contributor.author	Giakoumis, EG	en
dc.date.accessioned	2014-03-01T01:20:27Z
dc.date.available	2014-03-01T01:20:27Z
dc.date.issued	2004	en
dc.identifier.issn	1359-4311	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15930
dc.subject	Cylinder walls	en
dc.subject	Diesel engine	en
dc.subject	Temperature transients cv	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	Boundary conditions	en
dc.subject.other	Combustion chambers	en
dc.subject.other	Computer simulation	en
dc.subject.other	Data acquisition	en
dc.subject.other	Diesel engines	en
dc.subject.other	Fourier transforms	en
dc.subject.other	Heat transfer	en
dc.subject.other	Object oriented programming	en
dc.subject.other	Thermal insulation	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Direct injection (DI)	en
dc.subject.other	Thermal fatigue	en
dc.subject.other	Thermocouples	en
dc.title	Experimental and theoretical study of the short term response temperature transients in the cylinder walls of a diesel engine at various operating conditions	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.applthermaleng.2003.11.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.applthermaleng.2003.11.002	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The present work concerns a combined experimental and theoretical investigation of the interesting phenomenon of short term response (cyclic) temperature transients in the combustion chamber walls of a reciprocating internal combustion engine. The experimental work is carried out on a direct injection (DI), air-cooled, four-stroke, diesel engine located at the authors' laboratory. For this purpose, a novel experimental installation has been developed, which uses a new pre-amplification unit for the in-house developed fast response wall thermocouples and an object-oriented control code for fast data acquisition. A comprehensive simulation code of the thermodynamic cycle of the engine is developed, taking into account both the closed and the open parts of it. For the closed part, thermodynamic analysis of the measured pressure indicator diagrams is carried out to yield local temperature histories and the fuel burned mass rate, after combining it with a gas heat transfer sub-model. For the open part, a purely theoretical thermodynamic analysis is developed, applying the energy and state equations with appropriate gas heat transfer and mass exchange with the atmosphere sub-models. The model is appropriately coupled to a wall periodic conduction model, which uses as boundary condition the gas temperature variation throughout the engine cycle after being treated by Fourier analysis techniques. The theoretical analysis results compare well with the corresponding experimental ones, at the load and speed conditions examined. The influence that engine operating conditions and wall material properties have on the values of cyclic temperature swings is demonstrated. These oscillations, apart from possibly impairing the engine performance, may take prohibitive values due to high wall thermal fatigue, when materials such as thermal insulators are used. (C) 2003 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Applied Thermal Engineering	en
dc.identifier.doi	10.1016/j.applthermaleng.2003.11.002	en
dc.identifier.isi	ISI:000220065000005	en
dc.identifier.volume	24	en
dc.identifier.issue	5-6	en
dc.identifier.spage	679	en
dc.identifier.epage	702	en