A219 異なる二種類の光学像を用いた噴霧液滴の径および速度の同時計測法

Abstract

In general, spray field is a complicated and three-dimensional two-phase flow. The structure of it indicates strong correlation between size and velocity of droplets. Thus simultaneous measurement of size and velocity of the individual droplet in the spray is needed. In the recent years, the techniques based on Interferometric laser imaging for droplet sizing (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 field of droplets is based on the characteristic of light scattered from droplets. In this technique, droplet size was estimated by number of interference fringes, and 3D velocity field was reconstructed with 3D-PTV. Moreover, holography technique has been applied in order to separate the overlapping interferometric image, and its feasibility was verified.