Abstract
An optical measurement technique to investigate the characteristics of spray in swirl nozzle flow was developed with PTV and digital holography method. The purpose of the present experiment is to verify the accuracy of measurement of droplet size, size distribution and velocity measurement. This technique aims to obtain these properties and velocity profile simultaneously with simple optical setup. The digital holography technique is two optical path observation with Gabor type optical system. In the present system, the two interference patterns and glare point images were recorded on a hologram. The hologram was reconstructed to obtained the focused image of the droplets, so the particle size was obtained from the reconstructed images and interference fringe analytically. These data was compared and the measurement error was estimated for silica particles as a calibration standard. The experimental results showed that the simultaneous measurement was possible in a good accuracy.
