Abstract
In general, liquid spray field is a complicated and three-dimensional two-phase flow. The structure of it indicates strong correlation between size and velocity of droplets. In order to perform experimental analysis of the structure, simultaneous measurement of size and velocity of the individual droplet in the spray is the most important factor. In the recent years, the techniques based on IPI or ILIDS for the simultaneous measurement of droplet size and velocity were proposed as a field measurement technique, and the most of them are basically 2D measurement. However, multi-dimensional field measurement is indispensable for understanding of spray flow.In this report, a technique of simultaneous measurement of size and 3D velocity of droplets based on the characteristic of light scattered from droplets has been proposed. In this technique, droplet size was estimated by glare-points separation, and 3D velocity was reconstructed with 3D PTV. The present technique has been applied to the measurement of spray issuing from the swirl nozzle. And its validity of velocity measurement was confirmed by comparison with the result of stereoscopic PIV.
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