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Aerodynamic Control of Flow Around a Rigid Wing in Flapping Motion Using Geometry Modification Methods

Mohammadi, Mohammad Hossein | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51587 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ebrahimi, Abbas; Farahani, Mohammad
  7. Abstract:
  8. The physics of the flow around the wing in the oscillatory motion of the wing has various patterns, including the leading edge vortex, the tip vortex and trailing edge vortex escape. The interaction of these vortices forms a complex flow structure around the wing, which will have a direct effect on the aerodynamic performance of the wing. Therefore, controlling these structures can be considered as a way to improve the performance of the flapping wing. One of the passive flow control techniques that has recently been taken into consideration is a leading-edge protuberance method. Another type of passive flow control is geometric correction, using corrugation method. According to studies, two methods for controlling the passive flow of the corrugation method and leading-edge protuberance method on different Reynolds number and small geometries can significantly improve aerodynamic performance of the airfoil. Therefore, in this research, the feasibility of improving aerodynamic flapping wing performance has been done by applying the above flow control methods. For this purpose, a four-rod mechanism is used to generate flapping wing motion. Also, the four simple wings, chained in the direction of the chopper, the edge of the attack, and the chained edge of the escape with a span less than 30 cm. The streaming tool used includes a smoke, laser, and high speed camera. In this study, the detection of vortical flow structures around the wings in the wing movement, the manner of production, formation, growth and propagation of vortices around the wing have been investigated. It is also possible to control this vortex structure by means of geometric correction of wing shapes
  9. Keywords:
  10. Experimental Aerodynamics ; Flow Control ; Flapping Wing ; Corrugation Wing ; Leading Edge Vortex

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