1226 DIディーゼル機関の初期燃焼およびすす生成に与える燃料蒸気濃度の影響(OS-3 ディーゼル燃焼とガスエンジン)

概要

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The purpose of this study is to clarify the effect of vapor concentration on early ignition and soot formation process. The concentration of liquid- and vapor-phase fuel during a mixture formation process in a DI diesel engine has been investigated using planar laser induced exciplex fluorescence (LIEF) technique. Measurement has been made in a small-sized DI diesel engine. The experimental results show that: The relatively well-diffused vapor phase fuel, which has been passed through the active turbulent mixing process prior to ignition, affects the first ignition and initial soot formation. Ignition is occurred at the moment when the spatial distribution of fuel vapor formed in ignition delay period becomes homogeneous gradually. It was confirmed that a great deal of vapor phase fuel with relatively high concentration is distributed at the area between the fuel spray and cylinder head, where the vortex motion is promoted. It could be deduced that the vortex flow plays an role to promote the mixing and ignition process. It is probable that the region between the cylinder head and fuel spray axis is a good candidate for ignition and initial soot formation.
一般社団法人日本機械学会の論文
2001-03-16