(2-25) Arc and Kernel Tracking Ignition Model for 3D Spark-Ignition engine calculations((SI-7)S. I. Engine Combustion 7-Modeling)
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概要
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The present paper describes a new numerical model called AKTIM (Arc and Kernel Tracking Ignition Model) for describing the flame kernel expansion in SI engines. This model is divided into four submodels. One discribes the secondary side of the electrical inductive system of the spark plug, with the available initial electrical energy, resistance and inductance as input parameters, figure 1(a). The spark is modeled by a set of particles uniformally placed along the spark path, figure 1(b). This spark is elongated in time by the mean flow field. The flame kernel is described by lagrangian marker particles. Each kernel can be seen as the initial flame development of one particular cycle of the engine. It is convected by the mean and turbulent flows and it receives energy from the electrical circuit and loses energy by contact with the spark plug. Finally, a fourth submodel describes the spark plug by a set of discrete particles. This way no remeshing of the chamber mesh is needed. This new ignition model was introduced in KIVA-MB, a multibloc KIVA-II version. It constitutes a major evolution of the actual ignition model used in the Extended Coherent Flame Model (ECFM). The 3D calculations presented in this paper point out the improvements brought by AKTIM and its potential for future developments. First calculations show a good accordance with experimental data and the ability of the model to correctly represent multiple electrical breakdown, convection, and heat loss effects.
- 一般社団法人日本機械学会の論文
- 2001-07-01