LES of the Exhaust Flow in a Heavy-Duty Engine
2014 (English)In: Oil & gas science and technology, ISSN 1294-4475, E-ISSN 1953-8189, Vol. 69, no 1, 177-188 p.Article in journal (Refereed) Published
The flow in the exhaust port and the exhaust manifold of a heavy-duty Diesel engine has been studied using the Large Eddy Simulation approach. Some of the flow characteristics in these components are: flow unsteadiness and separation combined with significant geometry-induced secondary flow motion. Detailed analysis of these features may add understanding which can be used to decrease the flow losses and increase the eciency of downstream components such as turbochargers and EGR coolers. Few LES studies of the flow in these components have been conducted in the past and this, together with the complexity of the flow are the motivations for this work. This paper shows that in the exhaust port, even global parameters like total pressure losses are handled better by LES than RANS. Flow structures of the type that afect both turbine performance and EGR cooler efficiency are generated in the manifold and these are found to vary significantly during the exhaust pulse. This paper also clearly illustrates the need to make coupled simulations in order to handle the complicated boundary conditions of these gas exchange components.
Place, publisher, year, edition, pages
2014. Vol. 69, no 1, 177-188 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-116139DOI: 10.2516/ogst/2013117ISI: 000333020500012ScopusID: 2-s2.0-84894033755OAI: oai:DiVA.org:kth-116139DiVA: diva2:588823
QC 201404222013-01-162013-01-162014-04-22Bibliographically approved