Unsteady Flow Features of a Flapping and Pitching Wing At Low Reynolds Number
The unsteady flow field of a flapping-and-pitching flat plate wing of elliptic planform at a nominal Reynolds number, Rec = 4100 and reduced frequency, k = 0.138, was studied using flow visualization. Hydrogen bubbles and dye were employed as tracers. The study reveals many vortical flow features. The trailing edge vortex shows very interesting dynamics immediately following pitching at stroke reversal. A leeward surface spanwise flow towards the wing tip immediately following stroke reversal is observed. A vortex trapping model is proposed to explain enhanced lift observed in insects. The study has applications in flow control and micro air vehicle design and development.
K. M. Isaac et al., "Unsteady Flow Features of a Flapping and Pitching Wing At Low Reynolds Number," 25th AIAA Aerodynamic Measurement Technology and Ground Testing Conference, American Institute of Aeronautics and Astronautics (AIAA), Jan 2006.
Mechanical and Aerospace Engineering
United States. National Aeronautics and Space Administration
Ohio Aerospace Institute
Keywords and Phrases
Flow Control; Flow Visualization; Vortex Flow; Reynolds number
Article - Conference proceedings
© 2006 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.