NASA NTRS · 19880000429
Shadowgraphs Of Helicopter-Rotor-Tip Vortexes
Abstract
Optical apparatus produces full-scale or larger shadowgraph of tip vortexes of helicopter rotor. Stroboscope projects shadow image of helicopter rotor on large, square screen. Commercial, highly reflecting projection screen used; simply projecting image on white wall does not yield enough light for photographing vortexes with standard 35-mm camera. Apparatus adapts to use in large wind tunnels.
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Parthasarathy, Shakkottai P., Cho, Young I., Back, Lloyd H.. 1988-09-01. Shadowgraphs Of Helicopter-Rotor-Tip Vortexes. https://ntrs.nasa.gov/citations/19880000429
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