火花点火機関の燃焼室壁面付近における未燃焼炭火水素の挙動に関する実験的研究 : 点火時期, EGR, ガス流動が壁面上の潤滑油による未燃焼炭火水素の吸着, 放出に及ぼす影響

概要

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Exhaust HCs from spark ignition engines are considered a main source of photochemical air pollution. In this study the behavior of unburned HCs on the surface of the combustion chamber wall was investigated by a high-speed gas sampling technique during the expansion and exhaust processes. The mass of HCs near the surface of combustion chamber and that desorbed from oil on the combustion chamber wall were estimated with the models in which HC concentration profiles were assumed. When the engine was operated with ignition timing retardation and EGR, the quenching distances were lengthened and the mass of HC in the quenching layer was increased more than that of the operation of MBT and without EGR. It seemed that fuel absorption and desorption in oil could contribute to mass of unburned HCs in the combustion chamber in these operating conditions. The mass of HCs on the surface of the combustion chamber was not affected by the induction swirl that could increase the burning velocity and shorten the combustion duration.
一般社団法人日本機械学会の論文
1996-10-25