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Flow Field Effects on Flame Kernel Formation in a Spark-Ignition Engine
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Abstract
The effects of mixture turbulence and mean flow velocity on flame kernel formation in a spark-ignition engine were investigated using a disc-shaped optically accessible side chamber.
Three-dimensional flow predictions and LDA measurements were performed to get a better understanding of the flow field in this combustion chamber. Thin wire electrodes were located at a peripheral and a central position introduced into the combustion chamber via the glass windows. High-speed schlieren films at 40 kHz were taken from two orthogonal directions to visualize in detail the formation and development of the flame kernel. The purpose was to gain a better understanding of the interaction of turbulence and flame during the first milliseconds after spark breakdown of a transistorized coil ignition system and a capacitor discharge ignition system.
This study shows that the flame kernel is changed by the turbulence at flame radii of O.5 to 1 mm depending on turbulence intensity. At flame radii of more than 10 mm a fully developed turbulent flame has been formed. The influence of turbulence on the turbulent burning velocity during the flame kernel formation is less than during the main combustion period.
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Authors
- R. Herweg - Institute of Physical Electronics, University of Stuttgart, W. Germany
- Ph. Begleris - Institute of Physical Electronics, University of Stuttgart, W. Germany
- A. Zettlitz - Institute of Physical Electronics, University of Stuttgart, W. Germany
- G.F.W. Ziegler - Institute of Physical Electronics, University of Stuttgart, W. Germany
Topic
Citation
Herweg, R., Begleris, P., Zettlitz, A., and Ziegler, G., "Flow Field Effects on Flame Kernel Formation in a Spark-Ignition Engine," SAE Technical Paper 881639, 1988, https://doi.org/10.4271/881639.Also In
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