To obtain fundamental knowledge on the spray combustion, a lot of studies on the isolated droplet combustion have been doncucted. However, in the most studies, a droplet was suspended on a fiber, which may has influences on the combustion behavior. In addition, the initial droplet diameter of the suspended droplets was about 1 mm, much larger than the spray droplets. Therefore, in our laboratory, a piezo injector is used to form fine droplets about 60 micrometers in diameter. To gain knowledge of spray combustion, we measured the evaporation and ignition behavior of small droplets.

Fig.1 Experimental setup for droplet evaporation
Fig.2 Evaporation behavior of a fine droplet