高効率微粒化促進ノズルの微粒化特性と直接噴射式ディーゼル機関用噴射ノズルへの適用性

概要

論文の詳細を見る
It has been clarified that the strong disturbance in the nozzle hole, due to cavitation phenomena, greatly affected to atomization of a liquid jet. Since a nozzle for a direct injection Diesel engines is a pressure atomized type, it is difficult to obtain the excellent spray characteristics under low injection pressure. If the same excellent spray characteristics as ones of the high injection pressure was obtained at relatively low injection pressure, it is possible to miniaturize the injection system. When cavitation occurs in the nozzle hole, atomization of the liquid jet is enhanced considerably. Based on this concept, a new method for enhancing atomization of the liquid jet at low injection pressure, which involves the use of a simple nozzle in which a gap made at the nozzle hole, is proposed. The effects of geometric shapes and measurements of the atomization enhancement nozzle on atomization of the spray, the spray characteristics and application to an injector with a needle were studied. The results show that the excellent spray, which the spread of the spray is large and the breakup length is short, was obtained at relatively low injection pressure. Moreover, when this nozzle was applied to the injector with the needle, the same and the fine atomization characteristics were obtained at low injection pressure.
近畿大学の論文
2005-12-20