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Title: Numerical evaluation of combustion regimes in a GDI engine
Authors: Beavis, Nicholas J.
Ibrahim, Salah S.
Malalasekera, W.
Keywords: Numerical
CFD
Combustion
Turbulence
GDI
Engine
Issue Date: 2018
Publisher: Springer Verlag (© The authors)
Citation: BEAVIS, N.J., IBRAHIM, S.S. and MALALASEKERA, W., 2018. Numerical evaluation of combustion regimes in a GDI engine. Flow, Turbulence and Combustion, In Press.
Abstract: There is significant interest in the gasoline direct-injection engine due to its potential for improvements in fuel consumption but it still remains an area of active research due to a number of challenges including the effect of cycle-by-cycle variations. The current paper presents the use of a 3D-CFD model using both the RANS and LES turbulence modelling approaches, and a Lagrangian DDM to model an early fuel injection event, to evaluate the regimes of combustion in a gasoline direct-injection engine. The velocity fluctuations were investigated as an average value across the cylinder and in the region between the spark plug electrodes. The velocity fluctuations near the spark plug electrodes were seen to be of lower magnitude than the globally averaged fluctuations but exhibited higher levels of cyclic variation due to the influence of the spark plug electrode and the pent-roof geometry on the in-cylinder flow field. Differences in the predicted flame structure due to differences in the predicted velocity fluctuations between RANS and LES modelling approaches were seen as a consequence of the inherently higher dissipation levels present in the RANS methodology. The increased cyclic variation in velocity fluctuations near the spark plug electrodes in the LES predictions suggested significant variation in the relative strength of the in cylinder turbulence and that may subsequently result in a thickening of the propagating flame front from cycle-to-cycle in this region. Throughout this paper, the numerical results were validated against published experimental data of the same engine geometry under investigation.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work was supported by Jaguar Land Rover and the UK-EPSRC grant EP/K014102/1 as part of the jointly funded Programme for Simulation Innovation
Version: Published
DOI: 10.1007/s10494-018-9949-8
URI: https://dspace.lboro.ac.uk/2134/33527
Publisher Link: https://doi.org/10.1007/s10494-018-9949-8
ISSN: 0003-6994
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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