Measurements and analysis of load and speed effects on the instantaneous wall heat fluxes in a direct injection air-cooled diesel engine

Rakopoulos, CD; Mavropoulos, GC; Hountalas, DT

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Mavropoulos, GC	en
dc.contributor.author	Hountalas, DT	en
dc.date.accessioned	2014-03-01T01:15:41Z
dc.date.available	2014-03-01T01:15:41Z
dc.date.issued	2000	en
dc.identifier.issn	0363-907X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13671
dc.subject	instantaneous heat fluxes	en
dc.subject	speed and load effects	en
dc.subject	diesel engine	en
dc.subject	air cooled	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.other	CHAMBER INSULATION	en
dc.subject.other	COMBUSTION	en
dc.subject.other	PERFORMANCE	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	COMPONENTS	en
dc.subject.other	MODEL	en
dc.subject.other	FLOW	en
dc.title	Measurements and analysis of load and speed effects on the instantaneous wall heat fluxes in a direct injection air-cooled diesel engine	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/1099-114X(20000610)24:7<587::AID-ER604>3.0.CO;2-F	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1099-114X(20000610)24:7<587::AID-ER604>3.0.CO;2-F	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	This work presents an experimental analysis which is carried out to study the instantaneous heat fluxes, during the engine cycle, in the cylinder head and exhaust manifold of a direct injection, air-cooled, four-stroke diesel engine. For temperature measurements, a new pre-amplification unit for fast response thermocouples, appropriate heat flux sensors and an innovative, object-oriented, control code for fast data acquisition have been designed and developed at the authors' laboratory. The experimental installation separates the engine transient temperature signals into two parts; namely the 'long'- and the 'short'-term response ones; followed by their discrete processing in two independent data acquisition systems. One-dimensional heat conduction with Fourier analysis of the raw temperature data are implemented in order to calculate the instantaneous engine combustion chamber and exhaust pipe heat fluxes. This study concentrates on the correct interpretation of the measured temporal variations of heat fluxes and the examination of the effect of engine load and speed on the cylinder head and exhaust manifold heat flux losses. Many interesting aspects of transient engine heat transfer are revealed. The simultaneous presentation of heat fluxes on the cylinder head and exhaust manifold, together with the engine indicator diagram, sheds light into the mechanisms governing transient heat transfer during an engine cycle. Copyright (C) 2000 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	INTERNATIONAL JOURNAL OF ENERGY RESEARCH	en
dc.identifier.doi	10.1002/1099-114X(20000610)24:7<587::AID-ER604>3.0.CO;2-F	en
dc.identifier.isi	ISI:000087677800003	en
dc.identifier.volume	24	en
dc.identifier.issue	7	en
dc.identifier.spage	587	en
dc.identifier.epage	604	en