Simulation analysis of the unsteady gas flow in the inlet and exhaust manifolds of a multi-cylinder piston internal combustion engine

Kouremenos, DA; Rakopoulos, CD; Andritsakis, EC

dc.contributor.author	Kouremenos, DA	en
dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Andritsakis, EC	en
dc.date.accessioned	2014-03-01T02:48:08Z
dc.date.available	2014-03-01T02:48:08Z
dc.date.issued	1992	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33556
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0027003935&partnerID=40&md5=923f001aa40f31da6ea9d0656e10ac23	en
dc.subject.other	Automobile engine manifolds	en
dc.subject.other	Computer simulation	en
dc.subject.other	Differential equations	en
dc.subject.other	Exhaust systems (engine)	en
dc.subject.other	Finite difference method	en
dc.subject.other	Flow of fluids	en
dc.subject.other	Heat transfer	en
dc.subject.other	Intake systems	en
dc.subject.other	Mathematical models	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Unsteady flow	en
dc.subject.other	Inlet and exhaust manifolds	en
dc.subject.other	Multicylinder piston internal combustion engine	en
dc.subject.other	Internal combustion engines	en
dc.title	Simulation analysis of the unsteady gas flow in the inlet and exhaust manifolds of a multi-cylinder piston internal combustion engine	en
heal.type	conferenceItem	en
heal.publicationDate	1992	en
heal.abstract	The development of a comprehensive computer program for solving the unsteady flow problem in the inlet and exhaust manifolds of a multi-cylinder piston internal combustion engine is described. The mathematical simulation assumes one dimensional perfect gas flow in the pipes, incorporating wall friction, transient heat transfer rates, area and entropy gradients and variable gas specific heats with temperature and composition. The governing set of hyperbolic equations is transformed, via the characteristic curves mathematical technique, to a group of three slope equations, constituting the two wave characteristics and the pathline curves coupled with their associated compatibility equations, giving the change of the two Riemann variables and entropy along the above curves. The resulting set of differential equations is converted into a finite differences one and is solved on a normalized space and time field to provide the gas state and velocity distributions in all engine pipes, during a working engine cycle. Special attention is paid to setting up the appropriate boundary conditions at the pipes ends. As a validation of the present methodology, the analysis results are compared favourably with experimental data for a spark ignition engine taken from the literature. Using the analysis results, detailed charts are plotted showing the contours variation of gas pressure, temperature and Mach index against engine crank angle (time) and (inlet or exhaust) pipe length, providing useful information for the physical mechanisms involved and aiding towards the correct interpretation of the observed engine behaviour.	en
heal.publisher	Publ by ASME, New York, NY, United States	en
heal.journalName	American Society of Mechanical Engineers, Advanced Energy Systems Division (Publication) AES	en
dc.identifier.volume	27	en
dc.identifier.spage	253	en
dc.identifier.epage	270	en