This paper investigates the droplet transport phenomenon in the developing region of the spray injected by the atomizer with internal impinging mechanisms. The characteristics of the spray are measured by a two-component phase Doppler particle analyze...
This paper investigates the droplet transport phenomenon in the developing region of the spray injected by the atomizer with internal impinging mechanisms. The characteristics of the spray are measured by a two-component phase Doppler particle analyzer (PDPA) and the images are taken by a high speed camera. Instantaneous flow image shows the intermittence of the spray jet as injected with internal impingement. On the other hand, a large-scaled sinusoidal flow structure along the axial direction is observed when the spray jet is injected without internal impingement. Hence flow impingement inside the atomizer has strong effects on the structure of the spray jet because of the enhanced mixing processes between the liquid and gas phases. It turns out that the spray jet with internal impingement has a wider and more uniform distribution. Measurements of the distribution of the spray droplets and volume flux justify the above observation.