ディーゼル機関の燃焼後期かく乱による黒煙およびNO_xの同時低減に関する研究

概要

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The purpose of this study is to achieve simultaneous reduction in smoke and NO_x emitted from diesel engines. Generally, there is a trade-off between smoke and NO_x emissions, and a simultaneous reduction in both is difficult to realize. Generating strong turbulence late in the combustion period was attempted, to enhance smoke oxidation without disturbing the initial combustion stage where NO_x formation is dominant. The turbulence was generated by jets of burned gas from an auxiliary chamber installed in a direct injection diesel engine. For the reduction of NO_x, exhaust has recirculation (EGR) was combined with strong turbulence in the combustion chamber at a slightly retarded fuel injection timing. The experiments were very successful in reducing smoke in paticuler, as well as NO_x. Thermal efficiency was improved at full loads. The paper describes the effect of various operating conditions and combustion chamber configurations.
1989-09-25