The effect of ambient air flows on spray characteristics of a pressure atomizer = The effect of ambient air flows on spray characteristics of a pressure atomizer

다국어 초록 (Multilingual Abstract)

This research investigated the effect of the inner-swirl and outer-swirl flows arranged around a pressure atomizer on the spray characteristics. Water and air were used as a test liquid and an ambient gas, respectively. Spray shape was visualized by using laser tomographic method. Droplet-size and velocity were measured using a phase Doppler particle analyzer (PDPA). The air velocity was measured by PDPA using a tracer particle. The results showed that the spray shape was a hollow-cone. In the case with the inner-swirl flow, Sauter mean diameter and spray angle were small as compared with the case without inner-swirl flow. On the other hand, when the air was supplied as the outer-swirl flow, Sauter mean diameter was relatively large, while the spray angle was relatively constant and spray sheet became thinner. Recirculation zone was generated around the center of the hollow-cone spray. In the case with inner-swirl and outer-swirl flow, droplets size was relatively small. The supply of inner-swirl flow made the circulation region shift downstream.