2次元燃焼モデルによる水平副室付火花点火機関のサイクルシミュレーション : 非可逆型化学反応の場合

概要

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To understand the combustion process in a spark ignition engine with an unscavenged horizontal prechamber, the velocity distribution, gas temperature and gas pressure in the combustion chamber are calculated numerically with a two-dimensional combustion model. The simulation is applied to a test engine with three different diameters of torch nozzle under a constant operating condition. The model employs a simple irreversible chemical reaction rate, an ignition model of Flame Kernel type and a wall heat loss proportional to the heat release. The velocity vector and the temperature contour computed numerically are compared respectively with the torch flame patterns visualized by oil-film technique and the high-speed photographs of flame propagation. The computed results are shown in reasonable but qualitative agreement with the experimental ones in spite of the introduction of many assumptions due to the complexity of the problem. Although the two-dimensional computer simulation gives much useful information for combustion analysis, however, the simple irreversible reaction model is found to be not sufficient to predict properly the gas pressure history in comparison with the pressure diagrams yielded by strain-gauge type indicator.
東海大学の論文