Abstract
Studies on the techniques of measuring spray characteristics are essential for the research on liquid atomization. The spray characteristics are classified into three larger groups; atomizing mode, droplet sizes and spatial distribution of droplets. This report describes the techniques of measuring these characteristics.
First, high-speed photographing techniques are discussed for the measurement of atomizing mode. A flash lamp is usually used for the measurement, though it will be replaced in the future by a laser with the advantages of high power and short duration of emission. On the other hand, some techniques of image analysis have been developed. They offer useful information ab6ut spray characteristics based on the high-speed photographed images.
Next, the techniques of measuring droplet sizes are discussed. Although the immersion method and the sedimentation method have conventionally been used, applications of lasers are made on trial. The Laser-diffraction method and the phase-doppler methods are found to be useful. Some results obtaind by using these methods are reported.
And finally, the laser beam CT method is discussed for the measurement of particle distributions in spray.
Improvements are expected in the applications of laser and image processing to the techniques of measureing spray characteristics.
