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Effect of Turbulence on HCCI Combustion
Lunds Tekniska Högskola, Sweden.
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2007 (English)In: Session: Homogeneous Charge Compression Ignition (HCCI) (Part 4 of 8) Combustion Modeling / Optical Diagnostics, 2007Conference paper (Refereed)
Abstract [en]

This paper presents large eddy simulation (LES) and experimental studies of the combustion process of ethanol/air mixture in an experimental optical HCCI engine. The fuel is injected to the intake port manifolds to generate uniform fuel/air mixture in the cylinder. Two different piston shapes, one with a flat disc and one with a square bowl, were employed to generate different in-cylinder turbulence and temperature field prior to auto-ignition. The aim of this study was to scrutinize the effect of in-cylinder turbulence on the temperature field and on the combustion process. The fuel tracer, acetone, is measured using laser induced fluorescence (LIF) to characterize the reaction fronts, and chemiluminescence images were recorded using a high speed camera, with a 0.25 crank angle degree resolution, to further illustrate the combustion process. Pressure in the cylinder is recorded in the experiments. Spatial and temporal resolved LES was used to gain information on the turbulence mixing, heat transfer and combustion process. It was shown that gas temperature in the piston bowl is generally higher than that in the squish, leading to an earlier ignition in the bowl. Compared to the disc engine, the square bowl engine has a higher temperature inhomogeneity owing to the turbulence wall heat transfer. The experimentally observed higher combustion duration and slower pressure rise rate in the square bowl engine as compared to the disc engine can be explained by the higher temperature inhomogeneity in the square bowl engine.

Place, publisher, year, edition, pages
, SAE Technical papers, 2007-01-0183
Keyword [en]
Auto-ignition, Combustion duration, Combustion pro-cess, Crank angle degrees, Experimental studies, Fuel/air mixture, Gain information, Gas temperature, HCCI combustion, HCCI engine, Higher temperatures, Intake port, Laser induced fluorescence, Pressure rise, Reaction front, Turbulence mixing, Wall heat transfer
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-177543DOI: 10.4271/2007-01-0183ScopusID: 2-s2.0-84877175448OAI: diva2:873202
SAE World Congress & Exhibition, Detroit, MI; United States; 16 April 2007 through 19 April 2007

QC 20151124

Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-24Bibliographically approved

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Hultqvist, Anders
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