Method for laminar boundary layer transition visualization in fl

Details Method for laminar boundary layer transition visualization in fl Method for laminar boundary layer transition visualization in fl

1986-11-13

1988-10-04

Woodiel, Donald O.

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

116265, 116DIG43, G01M 900

Patent

active

047748354

ABSTRACT:
Disclosed is a method of visualizing laminar to turbulent boundary layer transition, shock location, and laminar separation bubbles around a test surface. A liquid crystal coating is formulated using an unencapsulated liquid crystal operable in a temperature bandwidth compatible with the temperature environment around the test surface. The liquid crystal coating is applied to the test surface, which is preferably pre-treated by painting with a flat black paint to achieve a deep matte coating, after which the surface is subjected to a liquid or gas flow. Color change in the liquid crystal coating is produced in response to differences in relative shear stress within the boundary layer around the test surface.

REFERENCES:
patent: 3511086 (1970-05-01), Woodmansee
patent: 3529156 (1970-09-01), Fergason et al.
patent: 3620889 (1971-11-01), Baltzer
patent: 3787874 (1974-01-01), Urban
patent: 3847139 (1974-11-01), Flam
patent: 4101696 (1978-07-01), Jennen et al.
patent: 4175543 (1979-11-01), Suzuki et al.

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