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Experimental evaluation of local instantaneous heat transfer characteristics in the combustion chamber of air-cooled direct injection diesel engine

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dc.contributor.author Rakopoulos, CD en
dc.contributor.author Mavropoulos, GC en
dc.date.accessioned 2014-03-01T01:28:22Z
dc.date.available 2014-03-01T01:28:22Z
dc.date.issued 2008 en
dc.identifier.issn 0360-5442 en
dc.identifier.uri http://hdl.handle.net/123456789/18822
dc.subject heat transfer coefficient en
dc.subject instantaneous en
dc.subject diesel engine en
dc.subject air-cooled en
dc.subject transient en
dc.subject.classification Thermodynamics en
dc.subject.classification Energy & Fuels en
dc.subject.other MODEL en
dc.subject.other COMPONENTS en
dc.subject.other FLUXES en
dc.subject.other BLENDS en
dc.subject.other WALLS en
dc.title Experimental evaluation of local instantaneous heat transfer characteristics in the combustion chamber of air-cooled direct injection diesel engine en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.energy.2008.02.003 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.energy.2008.02.003 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract An experimental analysis is conducted investigating the differences between the variations of overall and local instantaneous heat transfer coefficients, during the engine cycle, in the combustion chamber walls of a direct injection (DI), air-cooled diesel engine located at the authors' laboratory. For this purpose, a novel experimental installation is developed, which separates the engine transient temperature signals into two parts, namely the long- and the short-term response ones, processed in two independent data acquisition systems. Moreover, a new pre-amplification unit for fast response thermocouples, appropriate heat flux sensors and an object-oriented control code for fast data acquisition have been designed and applied. Experimentally obtained cylinder pressure diagrams are used as a basis for the calculation of the overall heat transfer coefficients, whereas one-dimensional heat conduction theory with Fourier analysis techniques, combined with an iterative procedure between calculated and measured temperature data, are implemented in order to calculate the instantaneous local heat transfer coefficients in the engine cylinder. Analysis of the experimental results reveals interesting aspects of transient engine heat transfer. Significant differences are disclosed between the overall and local heat transfer coefficient variations, with the importance of the latter one on engine design being emphasized. The local heat transfer coefficient on the cylinder head is quantified based on the experimental data. The effect of engine speed and load as well as of the air swirling motion on the heat transfer variations are presented. From the analysis results it is concluded that the instantaneous heat transfer variation is non-uniform, unlike its values calculated from standard correlations that assume spatial uniformity, noting that such information, especially for air-cooled diesel engines, seems to be very scarce in the open literature. (C) 2008 Elsevier Ltd. All rights reserved. en
heal.publisher PERGAMON-ELSEVIER SCIENCE LTD en
heal.journalName ENERGY en
dc.identifier.doi 10.1016/j.energy.2008.02.003 en
dc.identifier.isi ISI:000257010100008 en
dc.identifier.volume 33 en
dc.identifier.issue 7 en
dc.identifier.spage 1084 en
dc.identifier.epage 1099 en


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