Method and apparatus for detecting laminar flow separation and r

Details Method and apparatus for detecting laminar flow separation and r Method and apparatus for detecting laminar flow separation and r

1988-06-07

1989-07-18

Levy, Stewart J.

Measuring and testing

Miscellaneous

G01F 100

Patent

active

048481530

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 reattachement.

REFERENCES:
patent: 4154100 (1979-05-01), Harbaugh et al.
patent: 4739657 (1988-04-01), Higashi et al.
Manvel 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.

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