ABSTRACT
EXPERIMENTAL AND NUMERICAL INVESTIGATION OF FLOW FIELD AROUND FLAPPI
G AIRFOILS MAKING FIGURE-OF-EIGHT IN HOVER
BASKAN, Ö / zge
M.Sc., Department of Aerospace Engineering
Supervisor: Prof. Dr. H. Nafiz Alemdaroglu
September 2009, 94 pages
The aim of this study is to investigate the flow field around a flapping airfoil making figure-of-eight motion in hover and to compare these results with those of linear flapping
motion. Aerodynamic characteristics of these two-dimensional flapping motions are
analyzed in incompressible, laminar flow at very low Reynolds numbers regime using both
the numerical (Computational Fluid Dynamics, CFD) and the experimental (Particle Image
Velocimetry, PIV) tools. Numerical analyses are performed to investigate the effect of
different parameters such as the amplitude of motion in y-direction, angle of attack,
Reynolds number and camber on the aerodynamic force coefficients and vortex formation
mechanisms. Both symmetric and cambered airfoil sections are investigated at three
different starting angles of attack for five different amplitudes of motion in y-direction
including linear flapping motion. Experimental simulations are performed in order to verify
the numerical results only for linear motion at Reynolds number of 1000 for symmetric and
cambered airfoils at three different angles of attack. Computed vortical structures are then
compared to vorticity contours obtained from the experiments and advantages of figure-of&ndash / eight motion over linear motion are discussed.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/2/12611155/index.pdf |
| Date | 01 September 2009 |
| Creators | Baskan, Ozge |
| Contributors | Alemdaroglu, Nafiz |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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