Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   JULY 2017 , Volume 17 , Number 4 #P0099; Page(s) 41 To 51.
 
Paper: 

NUMERICAL ANALYSES OF THE VORTICAL FLOW OVER THE CRANKED KITE WING IN GROUND PROXIMITY

 
 
Author(s):  BAZRGAR MOHAMMAD JAVAD, DEHGHAN MANSHDI MOJTABA*
 
* DEPARTMENT OF MECHANICAL AND AEROSPACE ENGINEERING, MALEK ASHTAR UNIVERSITY OF TECHNOLOGY, ISFAHAN, IRAN
 
Abstract: 

In during take-off and landing phases, flow structures and aerodynamics forces differ from the unbounded flow field. Computational fluid dynamics were used to study the flow field of a cranked kite wing with the focus on studying vortices treatment. Different Angles of attack and heights were investigated at the freestream 70m/s. Q-criteria shows that in ground effect, vortices treatment is at angles of attack 2o, similar to 0o and angle of attack 8o similar to angles 4o and 6o.According to the topology of pressure gradient vectors at the angle of attack 2o, the center of all vortices in ground effect is fixed approximately. Axial residual vorticity, axial velocity and induced suction of all vortices increase and is surfaces of Q-criteria become thicker. At the angle of attack 8o with decreasing height, axial residual vorticity of the primary vortex and the wing kink location vortex increase and decrease respectively. Also, the kink location vortex approaches the primary vortex and it takes away from the wing surface. At the angle of attack 8o, the coherent structure of vortex between leading edge and the kink location vortex breaks down in ground effect and recirculation bubble form on the wing surface.
With decreasing height, the most drag and the lift coefficients increment occur on the lower surface of the wing.

 
Keyword(s): GROUND EFFECT, VORTICAL FLOW, CRANKED KITE WING, COMPUTATIONAL FLUID DYNAMICS
 
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