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Flame Reconstruction in Spark Ignition Engines
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Abstract
The present paper aims at discussing the flow/flame interaction in a lean burn spark ignition engine. The mean velocity and cycle resolved turbulence are measured with laser Doppler velocimetry. The cylinder pressure is recorded and a one-zone heat release calculation performed. The very early part of flame propagation is measured using two orthogonal Schlieren systems, each capturing one image of the progressing flame at a given time after spark onset. The two resulting 2D images are then, after preprocessing, used to reconstruct the three-dimensional flame.
The volume of the true flame is estimated by simulating, using Markov Chain Monte Carlo techniques, a number of possible flames that are consistent with the projections on the images. The uncertainty of the estimated flame volume is given by the variation of the volume estimates. In the calculations, the volume of that part of the spark plug that is inside the flame is subtracted.
The results show a correlation between fluid flow and the modelled three-dimensional flame extracted from the two Schlieren images. A very strong correlation may also be found between the flame size at 5 crank angle degrees after spark and the duration of 0-0.5% heat released, extracted from the cylinder pressure. As expected there is also a correlation between flame location and mean velocity.
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Citation
Lindgren, F., Johansson, B., and Holst, J., "Flame Reconstruction in Spark Ignition Engines," SAE Technical Paper 972825, 1997, https://doi.org/10.4271/972825.Also In
References
- Lindgren Finn Flame reconstruction by Markov chain Monte Carlo simulation Department of Mathematical Statistics, Lund University Sweden 1997
- Grenander Ulf Keenan Daniel Understanding variable shapes in 3-D Communications in Statistics, Stochastic Models 11 51 78 1995
- Johansson Bengt On Cycle to Cycle Variations in Spark Ignition Engines . Division of Combustion Engines, Dept. of Heat and Power Engineering, Lund Institute of Technology Box 118, 22100 Lund, Sweden 1995
- Johansson Bengt Influence of the velocity near the spark plug on early flame developement SAE International Congress and Exposition . SAE 1993 SAE paper 930481
- Marforio Karl Lassesson Bengt Johansson Bengt Influence of flow parameters and spark characteristics on the early flame development in a SI-engine The Third International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines 107 112 Yokohama July 1994 COMODIA 94 The Japan society of mechanical engineers
- Geman Stuart Geman Donald Stochastic relaxation, Gibbs distributions, and the Bayesian restoration of images IEEE Transactions on Pattern Analysis and Machine Intelligence 6 721 741 1984
- Besag Julian Spatial interaction and the statistical analysis of lattice systems (with discussion) Journal of the Royal Statistical Society B 36 192 236 1974
- Besag Julian Kooperberg Charles On conditional and intrinsic autoregressions Biometrika 82 733 746 1995
- Hastings W. K. Monte Carlo sampling methods using Markov chains and their applications Biometrika 57 97 109 1970
- Gilks W.R. Richardson S. Spiegelhalter D. J. Markov Chain Monte Carlo in Practice Chapman & Hall 1996
- Pischinger S. Heywood J.B. How heat losses to the spark plug electrodes affect flame kernel development in an SI-engine SAE International Congress and Exposition . SAE 1990 SAE paper 900021