希薄燃焼ガス機関の窒素酸化物生成に及ぼす混合気濃度不均一の影響

概要

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This study reveals that the mixture heterogeneity significantly affects the formation of nitrogen oxides in spark-ignition engines. The experimental results for a variety of engine types and sizes under lean-burning operation show that a homogeneous lean mixture permits much greater reduction of the exhaust NO_x concentration than a heterogeneous mixture. In addition, the histories of temperature distribution and NO concentration are calculated using a themodynamic model based on the measured rates of heat release for the mixture conditions having different degrees of heterogeneity. It is shown that a higher NO concentration results from the hot burnt gas ignited initially. Thus, lean burning of spark-ignition engines with a more homogenous mixture is desirable. It is also suggested that a significant reduction of NO concentration may be achieved once the burnt gases are mixed during combustion so as to make the burnt zone more uniform.
社団法人日本機械学会の論文
1995-08-25