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Experimental Investigation of the Effects of Canard Position on the Flowfield Over the Wing of a Model

Izadkhah, Mohammad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39720 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Soltani, Mohammad Reza
  7. Abstract:
  8. The analysis results of air combat simulations explain fighters succeed at close air combat that are super maneuverable and at high angle of attack controllable. Closed-coupled delta wing/canard configurations play an important role in modern aircraft design. These configurations offer high trimmed lift, improved agility and maneuverability as well, as a potential for increased lift-to drag ratio, all of which make them attractive to study. Experiments were carried out in a subsonic closed circuit wind tunnel over a delta wing model under the influence of canard. Canard was set in two different vertical positions, high and mid, with respect to the wing location. Flowfield measurements were performed by a special rake that contained high frequency pressure sensors. These studies were conducted with the presence of body in a wide range of angles of attack and canard deflections. Our data show that canard plays a significant role in maintaining vortical flow and delaying 'vortex breakdown' phenomenon over the wing surface, particularly at high angles of attack. Also, canard has remarkable impacts on the wing leading edge vortex. The most important influence of varying the vertical position of the canard is found to be on the canard vortex trajectory over the wing. In the mid canard configuration, canard and wing vortices merge and as a result of this phenomenon, abrupt pressure loss occures and thus more stable vortical flow maintain over the wing. Also it is shown that canard deflection with respect to the wing or freestream make significant changes on the flowfield over the wing.
  9. Keywords:
  10. Delta Wing ; Maneuverability ; Vortex Flow (Eddy Current) ; Canard Position

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