副室付火花点火機関の燃焼特性

概要

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To understand the mechanism of torch-combustion process in a divided combustion chamber spark-ignition engine, the performances of a prechamber engine without the third valve are measured with changing several parameters such as the torch-nozzle diameter, prechamber volume and air-fuel ratio, while keeping the volumetric efficiency and the engine speed constant. Some typical pressure-crank angle diagrams are analysed to determine such combustion characteristics as the ignition delay, combustion duration, heat release rate, mass burnt fraction and gas temperature. In addition, the flame propagation rate in each combustion chamber measured by the ion current method and the dimensionless torch-prechamber coefficient (β) introduced newly are also utilized to discuss the effects of the above parameters on the combustion characteristics, and to evaluate the relationship between the combustion charcteristics, and the engine performances.
東海大学の論文