ディーゼル機関におけるPCCI運転に適した燃焼室形状の選択に関する研究(熱工学,内燃機関,動力など)

概要

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The objective of this study is to obtain a strategy for selecting the combination of injection conditions and combustion chamber geometry to achieve low emissions with high thermal efficiency in direct-injection PCCI operation of a diesel engine. To this end, an experimental study was conducted using a single-cylinder test engine equipped with a common-rail injection system and a cooled EGR system. The injection conditions, including injection timing, spray angle and injection quantity, and combustion chamber geometry were varied under a reduced compression ratio and a high EGR rate conditions. The results indicate that CO emission can be reduced by selecting injection timings that provide high peak heat release rate. To improve the CO-NO_x trade-off relation, the spray angle should be properly selected depending on the combustion chamber geometry.
社団法人日本機械学会の論文
2008-03-25