4弁中央副室付ディーゼルエンジンの副室形状の最適化(熱工学,内燃機関,動力など)

概要

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A 4-valve center-located-subchamber diesel engine brings efficient use of the air because of the symmetric propagation of jets out of the subchamber into the mainchamber, but also a negative tendency toward a high level of smoke emission because of the small-volume subchamber. Analyses of indicators in the sub- and the main-chambers showed that a pin set at a down and peripheral part of the fuel spray in the subchamber, is an effective way of reducing the smoke emission, as a result from suppressed heat release in the subchamber. Visualization with a subchamber model showed that the pin acts on controlling flows and flame propagation in the subchamber, rather than as a heat spot for ignition. This finding suggests that a subchmaber without the pin can reduce the smoke emission, when its shape is optimized for the same kind of flow and combustion control as that with the pin. A successful example of a subchamber without the pin was proposed.
2002-10-25