ピストン位相を考慮したパイロット噴射によるディーゼル燃焼の改善

概要

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The fuel spray distribution in a DI diesel engine with a pilot injection was actively controlled by pilot and main fuel injections at different piston positions to avoid the main fuel injection form hitting the pilot flame. A CFD analysis demonstrated that the movement of the piston with a cavity devided by a central lip along the center of the sidewall effectively separated the cores of the pilot and main fuel sprays. The experiments showed that more smoke was emitted with pilot injection in an ordinary cavity without the central lip while smokeless and low NOχ operation was realized with pilot injection in a cavity divided by a central lip even at heavy loads where ordinary operation without pilot injection emitted smoke so much. The indicated specific energy consumption ISEC was a little bit higher with the pilot injection, mainly because of the reduction in the degree of constant volume combustion. With the advanced pilot injection, ISEC was improved more than that with the retarded pilot injection while the NOχ is a little higher than the retarded pilot injection maintaining still much lower than in ordinary operation.
社団法人日本機械学会の論文
2000-06-25