1107 予混合圧縮着火機関における混合気形成過程に及ぼす噴射条件の影響(オーガナイズドセッション : 環境問題とエネルギー)

概要

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The mixture formation process in a premixed compression ignition engine was numerically analyzed. This study aimed to find out effective injection conditions for lean mixture formation with high homogeneity, since the NOx and soot emissions in the engine are closely related to the mixture homogeneity. To calculate fuel spray behavior, a practical computer code GTT (Generalized Tank and Tube) was employed. The effects of injection parameters, such as injection timing, initial droplet size, spray cone angle, injection velocity, nozzle type (pintle and hole) and injection position / direction, on the mixture homogeneity near ignition timing (or TDC) were investigated. This study concludes that high homogeneity lean mixture could be achieved with a pintle type nozzle by combining an advanced injection and small initial droplets in a small spray cone angle. Furthermore, the side injection concept with hole type nozzles using spray-to-spray impingement is effective for the lean near-homogeneous mixture formation.
一般社団法人日本機械学会の論文
2000-09-08