K-2018 連絡孔面積の変更による二段噴射式IDIディーゼル機関の性能改善(S23-3 ディーゼル燃焼)(S23 エンジンの燃料消費率と排気の同時低減に向けて)

概要

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This research focused on the effects of throat geometry on combustion characteristics and engine performances of IDI diesel engine. The injection patterns used in this study were single-stage and two-stage injections. Since the fuel injected into the swirl chamber of IDI diesel engine is remained in the chamber, the excess air ratio in the swirl chamber is lower than that of a DI diesel engine under the same injection condition. When the fuel was injected at early timing, the ignition in the swirl chamber was smoothly occurred comparing with that of DI diesel. To find out the advantages of the smooth ignition on the combustion, both of a normal throat type IDI diesel engine and a wide throat type IDI diesel engine were used to clarify the effect of ignition delay and engine performance. The analysis of the heat release rate indicated that the ignition delay in the swirl chamber controlled the combustion phenomena and this ignition delay was affected by the throat geometry. The NO emissions decreased with the wide throat type IDI diesel engine because the ignition occurred before the premix of fuel/air was completely promoted.
一般社団法人日本機械学会の論文
2001-08-22