Abstract
In order to measure the disintegration phenomena of diesel fuel droplet by a compact PIV optical system with variable lighting duration, 15 red super bright LEDs and 15 yellow ones were used for a light source. More electric currents than ten times of the standard were supplied to each LED for increasing the light intensity. A CCD camera was used to record images of glass beads of 30, 60, and 100μm in diameter mixed in the air jet stream. It is clearly shown that the luminosity integration value of a particle image is proportional to the 2nd power of particle diameter. Two images corresponding to two kinds of LED were extracted from the double exposure image of fuel droplets injected in the atmosphere from the diesel fuel injection nozzle. It is clarified that inner droplets is larger than outer droplets in the spray periphery region.
