Abstract
Neutrally buoyant helium-filled soap bubbles were used to determine fluid particle pathlines and velocities in the airstream surrounding an 18-in. nominal diameter flat circular parachute model. The bubbles, dynamically indistinguishable from the air that they displaced and highly reflective because of their soap film outer surface, were photographed in two orthogonal planes by high-speed motion picture cameras. Positions of matched bubble pairs from the two views were entered into computer files frame by frame by projecting the films onto a digitizing tablet and using a light pen. This information, along with the film frame rates, was used to timedifferentiate the pathlines to produce velocity data. Some 3000 bubble-frame pairs generated velocity plots covering the region near the canopy for times between 7=0 and steady-state conditions.
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