G070012 ディーゼル噴霧の雰囲気導入/飲み込み過程に及ぼす雰囲気密度の影響([G07001]エンジンシステム部門一般セッション(1):燃料噴霧と燃焼)

概要

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An experimental study was made of the characteristics of ambient gas entrainment into a non-evaporating fuel spray injected by a Diesel common rail injection system into a high-pressure constant volume vessel. The gas flow field around the spray was measured using a particle image velocitmetry coupled with a laser induced fluorescence (LIF-PIV) technique. The mass flow rate of the ambinet gas into the spray through the spray boundary was calculated by using the ambient gas velocity data. The spray-ambient gas interactions along the spray boundary were categorized into three sections, that is, (1) the entraiment section from nozzle exit to the middle of the spray, (2) the capturing section at the spray tip, and (3) the recirculation section between (1) and (2) where relatively large-scale vortexes appear along the spray boundary. The ambient gas flow rate into the spray through the section (2) is more dominant rether than that through the section (1). The total flow rate of the ambient gas into the spray increases as the ambient gas density increases.
一般社団法人日本機械学会の論文
2011-09-11