ディーゼル燃焼における熱発生率経過がNO_x濃度履歴に及ぼす影響

概要

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For determining the optimum combination of combustion control techniques to reduce NO_x emission from diesel engines, it is important to clarify the effects of each technique not only on the NO_x emission but also on its time history during combustion. In this paper, NO_x concentration in the combustion chamber of a rapid compression machine has been measured by using a total gas sampling method. In order to elucidate the relation between NO_x history and heat release rate, air temperature, nozzle hole size and air motion are varied to control the heat release process. The results show that NO_x emission is not solely dependent upon initial combustion. Air utilization in the main diffusive combustion phase has great influence on NO_x formation and its decay. NO_x formation is accelerated by activation of the initial stage of the main combustion when using a nozzle with small holes.
社団法人日本機械学会の論文
1996-06-25