Abstract
Effect of tip vortices on flow and laminar separation bubble over NACA4412 aerofoil at low Reynolds numbers and different angles of attack was investigated in detail by performing force and flow visualization via smoke wire technique. Experiments have been done at Reynolds number of 50000 and the wing model of aspect-ratio was 1 and 3, respectively. From the experimental results, the flow visualization results showed that tip vortices effect on the laminar separation bubble and the bubble reduces over the wing with low aspect ratio as the angle of attack increased. Moreover, it was noticed that stall angles decreased as aspect-ratio increased at the same Reynolds number.
Highlights
The aerodynamic of low aspect-ratio wings have been extensively investigated by aerodynamic researches keen on low aspect ratio wings and low Reynolds numbers [119]
Effect of tip vortices on flow and laminar separation bubble over NACA4412 aerofoil at low Reynolds numbers and different angles of attack was investigated in detail by performing force and flow visualization via smoke wire technique
The flow visualization results showed that tip vortices effect on the laminar separation bubble and the bubble reduces over the wing with low aspect ratio as the angle of attack increased
Summary
The aerodynamic of low aspect-ratio wings have been extensively investigated by aerodynamic researches keen on low aspect ratio wings and low Reynolds numbers [119]. At low Reynolds number flow conditions, some negative effects are occurred such as decreasing on lift, increasing on drag, reducing stability of the aircraft, vibration, and noise due to the laminar separation bubble [4,5,6,7,8,9,10,11]. Genç et al conducted an experimental [9] and numerical [11] studies over the NACA2415 aerofoil at various angles of attack and low Reynolds numbers. They noticed that due to the increasing Reynolds number and angle of attack the point of separation and reattachment moved towards to leading edge. Results are compared and discussed with literature studies if these experimental results are in coherence
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