Flame kernel formation and propagation modelling in spark ignition engines

Abstract

One-dimensional, time-dependent numerical simulations of flame kernel growth produced by a spark in a combustible gasoline-air mixture are presented. This model accounts for the fundamental properties of the ignition system, the combustible mixture and flow fleld. Submodels representing the cylinder pressure and temperature, heat transfer to the cylinder wall and spark plug electrodes or ambient air, effects of the residual gas and so on. In addition, to research the effects of ignition energy, two kinds of ignition systems are used. The results show that the increased breakdown energy enlarges the plasma radius, which derives faster development of the initial flame kernel. The heat transfers to the electrodes and the cylinder wall also affect the growth of the kernel. These results appear to be coherent with previous experimental visualizations. The simulations are validated by different engine running conditions, for example air-fuel ratio, spark advance, engine speed and intake manifold pressure.

Keywords

flame kernel ignition breakdown/arc/glow discharge electrode ignition energy Laminar/turbulent burning

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