Loading...

Influence of Tail on the Wing Pressure Distribution of a Model at Different Conditions

Bahman Jahromi, Iman | 2010

715 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41585 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Soltani, Mohammad Reza; Ghorbanian, Kaveh
  7. Abstract:
  8. Control surfaces are used in combat aircrafts to control the pitching moment and to help the aircraft perform high angle of attack manoeuvres. For delta wing configuration, the flow characteristics around the horizontal tail depend on the wing and tail flow field and their interactions. The flow over delta wing is mainly characterised by strong vortices. These vortices move downstream and affect the tail flow field making the problem more complicated. The goal of this research is to study the effect of tail up wash on the horizontal wing-body- tail configurations in subsonic flow. For this purpose a series of wind tunnel tests were conducted on a model containing a moveable horizontal tail and a delta wing planform. Tests are performed at different sweep angles and aspect ratios of the wing and at various tail deflection angles (wing sweep angles of 30°, 45° and 60° and wing aspect ratios of 0.5 and 1). Static surface pressure distribution on the wing is measured at all conditions (static and dynamic changes in tail angle of attack). The strength of the vortices over different wings are compared and the effect of tail deflection on the wing flow field is compared with each other. It is seen that the wing sweep angle is a dominant factor for the strength of the vortices over the wing and maneuverability of the vehicle. As the sweep angle increases, vortices on the wing get stronger and get less affected by the tail up wash. Negative tail deflections affect wing with aspect ratio of 0.5 more than that of the other configurations. By increasing the wing aspect ratio, positive tail deflections influence the wing surface pressure more. A few frequency analyzes Have been performed to understand the forementioned interactions better. Dynamic oscillations of the tail affects wing surface pressure more than that of the static ones for different tail deflection angles.

  9. Keywords:
  10. Delta Wing ; Vortex Flow (Eddy Current) ; Wind Tunnel ; Tail

 Digital Object List

 Bookmark