2016 Volume 47 Issue 5 Pages 1057-1062
The characteristics of the fuel spray are known to be affected by cavitating flow inside the nozzle hole. Due to the difficulty of the investigation inside the nozzle with real size injector, there are many reports using enlarged transparent nozzle. However, the promotion mechanism of cavitation phenomena for spray atomization process has not been yet clarified. In this paper, the cavitation phenomena inside the nozzle hole was visualized by using enlarged transparent nozzles of varying length-to-width ratio (l/w ratio) in order to clarify the effect of l/w ratio on cavitation phenomena inside the nozzle hole and on the behavior of injected liquid jet. As results of these experiments, the growth and phase of cavitation depend on l/w ratio. Furthermore, it has become clear that spread of the liquid jet strongly depends on the length from cavitation reattachment point to nozzle exit.
