The influence of the exhaust system unsteady gas flow and insulation on the performance of a turbocharged diesel engine

Rakopoulos, CD; Andritsakis, EC; Hountalas, DT

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Andritsakis, EC	en
dc.contributor.author	Hountalas, DT	en
dc.date.accessioned	2014-03-01T01:11:33Z
dc.date.available	2014-03-01T01:11:33Z
dc.date.issued	1995	en
dc.identifier.issn	0890-4332	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11691
dc.subject	Computer Program	en
dc.subject	Diesel Engine	en
dc.subject	Fluid Dynamics	en
dc.subject	Gas Flow	en
dc.subject	Heat Transfer	en
dc.subject	High Speed	en
dc.subject	Indexation	en
dc.subject	Parametric Study	en
dc.subject	Partial Differential Equation	en
dc.subject	Second Law	en
dc.subject	Thermodynamics	en
dc.subject	Time Varying	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.title	The influence of the exhaust system unsteady gas flow and insulation on the performance of a turbocharged diesel engine	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0890-4332(95)90037-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0890-4332(95)90037-3	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	A comprehensive digital computer program is used to simulate the unsteady gas flow in the exhaust and inlet systems of a multi-cylinder, turbocharged, medium-high speed, four-stroke diesel engine installed at the authors' laboratory. The simulation assumes one-dimensional, time-varying gas flow in the engine pipes and incorporates numerous realistic fluid dynamic, thermodynamic and heat-transfer features. The characteristic mathematical transformation solution of the gas-flow dynamics partial differential equations is interfaced with First-Law analysis models of the cylinders main chambers and prechambers. The simulation results are compared most favourably against the engine's experimental performance results, which include mean air consumption rate, pressure histories at various locations on the exhaust system, and energy-mean temperature values at the exit of the exhaust system. The simulation results are also utilized for the determination of the various cylinders' exhaust waves intensity, as they are imposed by the design characteristics of the exhaust manifold. The plotting of relevant charts, showing the contour variation of gas pressure, temperature and Mach index against engine crank angle and pipe length, aids the correct interpretation of the observed behaviour. The detailed simulation of the fluid dynamic and heat-transfer fields in the engine exhaust system, permits an interesting parametric study of the influence of the degree of insulation of the exhaust system on the energy and exergy (availability) content of the exhaust gases before the turbocharger turbine, by coupling the above First-Law with Second-Law analysis concepts. © 1994.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Heat Recovery Systems and CHP	en
dc.identifier.doi	10.1016/0890-4332(95)90037-3	en
dc.identifier.isi	ISI:A1995PV62600006	en
dc.identifier.volume	15	en
dc.identifier.issue	1	en
dc.identifier.spage	51	en
dc.identifier.epage	72	en