Experimental analysis of the wake of an oscillating airfoil
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Authors
Dohring, Claus M.
Subjects
Vortical Wake Visualization
Drag-/ Thrust Signature
Comparison with Calculation
Drag-/ Thrust Signature
Comparison with Calculation
Advisors
Platzer, Max F.
Date of Issue
1996-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The wake of an airfoil which oscillates in pure plunge mode is investigated in a water tunnel over a wide range of reduced frequency and amplitude. The main focus of this study is the comparison of the experimentally determined wake geometry with numerical results from a potential flow code. The wake vortices are visualized by two-color dye injection and velocity profiles are measured with LDV upstream and downstream of the airfoil. Wake signatures are examined with regard to thrust or drag generation. There is a good agreement between calculated and experimental data of the vortical wavelength. At high plunge velocities both approaches show a loss of wake symmetry and the emergence of a dual mode wake behavior
Type
Thesis
Description
Series/Report No
Department
Astronautical Engineering
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
136 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.