An investigation of the aerodynamic response of a wind anemometer

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Author
Laferty, John Denison
Hicks, William Franklin
Date
1967-06Advisor
Schmidt, Louis V.
Metadata
Show full item recordAbstract
An experimental investigation was made to determine the aerodynamic
response of a wind anemometer to unsteady air loads. The anemometer, a
perforated drag sphere mounted upon a cylindrical pedestal, sensed
dynamic pressure by a strain gage balance system.
The anemometer response was calibrated for static and dynamic
mechanical inputs and for steady aerodynamic loads prior to the unsteady
investigation. The unsteady environment was obtained in an
oscillating flow wind tunnel which utilizes a rotating shutter valve to
superimpose a harmonically varying velocity upon a mean free stream.
For steady flow conditions the anemometer drag coefficient remained
essentially constant, apparently independent of Reynolds number. The
anemometer responded well to the unsteady air loads at frequencies up
to 20 cycles per second and mean dynamic pressures to 8.85 pounds per
square foot. Unsteady aerodynamic response was qualitatively substantiated
by a quasi-steady approximation to the measured unsteady drag.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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