Investigation of light source and scattering medium related to vapor-screen flow visualization in a supersonic wind tunnel

Computer Science

Scientific paper

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Arc Lamps, Flow Visualization, Light Scattering, Mercury Arcs, Mie Scattering, Supersonic Wind Tunnels, Fresnel Lenses, Imaging Techniques, Screens

Scientific paper

Methods for increasing the radiant in light sheets used for vapor screen set-ups were investigated. Both high-pressure mercury arc lamps and lasers were considered. Pulsed operation of the air-cooled 1-kW lamps increased the light output but decreased reliability. An ellipsoidal mirror improved the output of the air-cooled lamps by concentrating the light but increased the complexity of the housing. Water-cooled-4-kW lamps coupled with high-aperture Fresnel lenses provided reasonable improvements over the air-cooled lamps. Fanned laser beams measurements of scattered light versus dew point made in conjunction with successful attempts to control the fluid injection. A number of smoke generators are described and test results comparing smoke and vapor screens are shown. Finally, one test included a periscope system to relay the image to a camera outside the flow.

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