NASA NTRS · 19870000409
Coatings Show Laminar Boundary-Layer Transitions
Abstract
New method, utilizing liquid-crystal coatings, provides means to visualize transition in flight. Difference in levels of relative shear stress or skin friction between laminar and turbulent boundary layers one order of magnitude. Difference in skin friction is physical parameter to which liquid crystals respond. Transition measured and documented on aircraft in flight at altitudes above 20,000 ft., up to at least 50,000 ft. at subsonic and supersonic speeds. Technique has rapid response and reversible; capability of indicating unlimited number of transition locations during single flight.
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Holmes, Bruce J., Gall, Peter D., Croom, Cynthia C., Manuel, Gregory S., Kelliher, Warren C.. 1987-09-01. Coatings Show Laminar Boundary-Layer Transitions. https://ntrs.nasa.gov/citations/19870000409
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