3221 拡大ナノ秒撮影による高圧ディーゼル噴霧液滴群の蒸発に関する研究(S48-1 燃料噴霧・混合気形成(1),S48 燃料噴霧・混合気形成)

概要

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Evaporating process and ignition of diesel spray were investigated by a magnified nano-spark photography method and a rapid compression machine. Ignition of diesel spray was also observed by high-speed photography using high-speed digital video camera. Observation of flame development shows that ignition of diesel spray commences first at spray boundary upstream of the spray tip. At low injection pressure, luminous flame is seen at ignition position. On the contrary, at high injection pressure, initial flame develops quickly to the downstream just after ignition and brilliant flame is observed at spray tip. Photographs of evaporating sprays show that evaporation is first promoted at ignition region during injection. High-pressure injection is effective to atomization of droplets at both spray boundary and spray tip regions. It is indicated that ignition commences where a lot of droplet evaporate and combustible mixture is first formed.
社団法人日本機械学会の論文
2005-09-18