Research on formation and growth of flame kernel in spark ignition engine |
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| Institution: | 1. Nippon Soken Inc., 13 Iwaya, Shimohasumi-cho, Nishio-shi, Aichi, 445 Japan;2. Vehicle Development Center 4, Toyota Motor Co., Ltd., 1200, Mishuku, Susono-shi, Shizuoka, 410-11 Japan;1. Aalto University, School of Engineering, Department of Mechanical Engineering, Finland;2. Swiss Federal Institute of Technology Zürich (ETHZ), Switzerland;1. Division of Combustion and Propulsion Systems, Chalmers University of Technology, Göteborg, Sweden;2. Chair of Fluid Dynamics, Institute of Combustion and Gas-Dynamics, Universität Duisburg-Essen, Duisburg, Germany;3. Brandenburgische Technische Universität Cottbus-Senftenberg, Cottbus, Germany |
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| Abstract: | The recent developments for lean mixture and high EGR ratio in the spark ignition engine have improved fuel consumption and exhaust emission, so that partial pressure of oxygen, or fuel density in the cylinder, is reduced; thus, the energy necessary for ignition is increased 1–4]. This problem is solved either by supplying high energy in a short period or by slowly raising the amount of energy. This research uses the latter method. The formation and growing process of the flame kernel was observed under various energy discharging durations. Therefore, a stable ignition that is effected by the extended energy discharging duration was found. Consequently, this helps the growth of the flame kernel. The effective spark duration under easy-to-fire conditions was also investigated. |
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