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Effect of Turbulence on HCCI Combustion

Yu, Rixin LU ; Bai, Xue-Song LU ; Vressner, Andreas LU ; Hultqvist, Anders LU ; Johansson, Bengt LU ; Olofsson, Jimmy LU ; Seyfried, Hans LU ; Sjöholm, Johan LU ; Richter, Mattias LU and Aldén, Marcus LU (2007) In SAE technical paper series
Abstract
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 autoignition. 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... (More)
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 autoignition. 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion engines diagnostics HCCI
in
SAE technical paper series
publisher
Society of Automotive Engineers
external identifiers
  • Scopus:84877175448
language
English
LU publication?
yes
id
1330a882-c213-49ef-8c4e-ddfd5105ed0b (old id 742382)
alternative location
http://www.sae.org/technical/papers/2007-01-0183
date added to LUP
2007-12-13 11:56:53
date last changed
2016-11-15 13:24:27
@misc{1330a882-c213-49ef-8c4e-ddfd5105ed0b,
  abstract     = {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 autoignition. 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.},
  author       = {Yu, Rixin and Bai, Xue-Song and Vressner, Andreas and Hultqvist, Anders and Johansson, Bengt and Olofsson, Jimmy and Seyfried, Hans and Sjöholm, Johan and Richter, Mattias and Aldén, Marcus},
  keyword      = {Combustion engines diagnostics HCCI},
  language     = {eng},
  publisher    = {ARRAY(0xb7705a8)},
  series       = {SAE technical paper series},
  title        = {Effect of Turbulence on HCCI Combustion},
  year         = {2007},
}