21103 燃料噴射ノズル孔のR取り形状が噴霧の燃焼特性に及ぼす影響(燃料と燃焼の新しい展開(1),OS.9 燃料と燃焼の新しい展開,学術講演)

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In this paper, measurement of spray angles and spray tip penetrations, ignition delay of the spray from the nozzles with and without rounding-off hole inlet were conducted in a high pressure high temperature cylindrical chamber. Further, fuel flow in the nozzle hole was numerically simulated by three dimensional high precision nozzle flow model. The experimental results show that the spray angle of the nozzle without rounding-off is larger than that of nozzle with rounding-off under atmospheric pressure and that ignition delay of spray from the nozzle without rounding-off is longer than nozzle with rounding-off under low ambient temperature. By the numerical simulation, a cavitation occurs in the nozzle hole without rounding-off inlet, but the cavitation level decreases significantly for the cases of nozzles with rounding-off.
一般社団法人日本機械学会の論文
2008-03-13