Measuring and testing – Miscellaneous
Patent
1989-05-04
1990-06-26
Raevis, Robert R.
Measuring and testing
Miscellaneous
G01F 100
Patent
active
049361465
ABSTRACT:
The invention is a method and apparatus for simultaneously detecting laminar separation and reattachment of a fluid stream such as an airstream from and to the upper surface of an airfoil 22 by simultaneously sensing and comparing a plurality of output signals S, each representing the dynamic shear stress at one of an equal number of sensors 27 spaced along a straight line on the surface of the airfoil 22 that extends parallel to the airstream. The output signals S are simultaneously compared to detect the sensors across which a reversal in phase of said output signal S occurs, said detected sensors being in the region of laminar separation or reattachment.
REFERENCES:
patent: 4154100 (1979-05-01), Harbaugh et al.
patent: 4739657 (1988-04-01), Higashi et al.
Manuel et al., "The Laminar Separation Sensor: An Advanced Transition Measurement Method for Use in Wind Tunnels and Flight", SAE Technical Paper Series, presented Apr. 28-30, 1987.
Mangalam Sivaramakrishnan M.
Stack John P.
Adams Harold W.
Glenn Charles E. B.
Manning John R.
Raevis Robert R.
The United States of America as represented by the Administrator
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