Participation of Inert Species in Air in Piston-Compression Ignition

概要

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The effect of inert species on low-temperature piston-compression ignition is examined. Pseudo-air is prepared by replacing the inert species in air with pure argon. Lean mixtures are composed of leaded or unleaded gasoline as the fuel and the pseudo-air or real air as the oxidizer. Cool-flame ignition delay τ_1 does not differ between the case of using unleaded and that of using leaded gasoline. A difference between the effects of the two oxidizers can be found in the blue flame ignition delay τ_2 under considerably lean conditions at an equivalence ratio of 0.7. An anti-knock additive, tetramethyllead, does not seem to be responsible for this difference. At onset of cool flame and blue flame in a pancake chamber a sliced-pineapplelike structure which has a central core bulk and a surrounding ring portion near the cylinder wall appears. Only when air is used as the oxidizer, does a blue flame appear in the ring portion near the cylinder wall earlier than in the central core. Inert species such as nitrogen or argon might participate in the eIementary chemical reactions appearing in preflame periods. Argon is chemically inert, but nitrogen or nitrogen compounds probably participate in the preflame reactions in the case of low-temperature ignition.
一般社団法人日本機械学会の論文
1996-05-15