ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
The feasibility of determining the droplet size distribution of a simulated defoliant spray in a high-velocity airstream using in-line holographic photography was successfully demonstrated. Holographic droplet size data were obtained in the 400-knot airstream contained within a 37-inch-diameter duct at spray flow rates from 3 to 117 gpm and spray injection pressures from 16 to 64 psig. Average diameter of the spray droplets was approximately 21 microns. Droplet size distribution did not vary significantly with either spray flow rate or injection pressure. The holographic measurement system exhibited an apparent diametric resolution limit of approximately 10 microns. Operational reliability of the holograph was satisfactory.
Final rept. 27 Jan-12 Feb 1970
Prepared in cooperation with ARO, Inc., Tullahoma, Tenn.