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The unsteady normal force on an airfoil in oscillating flow

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Author
Banning, Maurice Ray
Date
1969-09
Advisor
Miller, James A.
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Abstract
the effects of oscillating flow on the pressure force normal to the chord of a symmetrical airfoil were investigated experimentally employing a remote pressure transducer to measure the instantaneous pressure distribution. An open circuit wind tunnel having a set of the test section was used to produce the oscillating flow. Electrical signals analogous to the free stream velocity and surface pressure were recorded simultaneously on separate tracks of a magnetic tape. The recorded data were converted to digital representation, and numerical techniques utilized to evaluate the spectral composition of the measured pressure distribution, from which the normal force was calculated. It was found that the magnitude of the total normal force at high angles of attack is significantly greater in oscillating flow than is steady flow and is frequency dependent; while a low angles of attack no significant differences were observed. Moreover it was found that higher order harmonics of the fundamental free-stream frequency constitute a significant fraction of the normal force, and these fractions are also frequency dependent. The observed results are not adequately predicted by quasi-steady aerodynamic analysis.
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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.
URI
http://hdl.handle.net/10945/13339
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Related items

Showing items related by title, author, creator and subject.

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    Pressure distribution on an airfoil in oscillating flow 

    Allen, Terry Jon (Monterey, California. U.S. Naval Postgraduate School, 1969-06);
    The effect of oscillating flow on the pressure distribution of a symmetrical airfoil was investigated experimentally employing a remote pressure transducer. An open circuit wind tunnel utilizing rotating shutter blades ...
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    Aerodynamic coefficients of a symmetrical airfoil in an oscillating flow 

    Chamberlain, George A. (Monterey, California: Naval Postgraduate School, 1990-09);
    A symmetrical airfoil at fixed angle of attack from 0 to 35 degrees was placed in an air flow with controlled velocity oscillations at 10 Hz. The instantaneous pressure distribution and flow velocity were measured ...
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    A computational and experimental investigation of the propulsive and lifting characteristics of oscillating airfoils and airfoil combinations in incompressible flow 

    Neace, Kerry S. (Monterey, California. Naval Postgraduate School, 1992-09);
    Computational and experimental methods have been used to systematically study one and two airfoils undergoing unsteady motion. first, a single airfoil analysis with the modified computer code, U2DIFF. thrust, efficiency, ...
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