Numerical modeling of the vortex breakdown phenomenon on a delta wing with trailing-edge jet-flap

The flow development over delta wings is highly complicated since the interaction of the angle of attack with the delta-wing geometry leads to the appearance of a pair of well-organized counter-rotating leading-edge vortical structures. For relatively moderate angles of attack, these vortices remain...

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Bibliographic Details
Published in:International journal of heat and fluid flow 2010-12, Vol.31 (6), p.1087-1095
Main Authors: Kyriakou, Marilena, Missirlis, Dimitrios, Yakinthos, Kyros
Format: Article
Language:English
Subjects:
Aerodynamics
Angle of attack
Applied fluid mechanics
Computational fluid dynamics
Computational methods in fluid dynamics
Delta wing
Delta wings
Exact sciences and technology
Fluid dynamics
Fluid flow
Fundamental areas of phenomenology (including applications)
Mathematical models
Physics
Trailing-edge jet-flaps
Turbulence
Turbulence modeling
Turbulent flow
Vortex breakdown
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Summary:The flow development over delta wings is highly complicated since the interaction of the angle of attack with the delta-wing geometry leads to the appearance of a pair of well-organized counter-rotating leading-edge vortical structures. For relatively moderate angles of attack, these vortices remain robust and contribute to the enhancement of the overall lift performance. However, at higher angles of attack the vortices develop instabilities leading to the well-known vortex breakdown phenomenon, resulting in a deterioration of the aerodynamic properties. Thus, delaying vortex breakdown at higher angles of attack, is important and for this reason various techniques have been developed to control the breakdown mechanism. Such a technique is the use of trailing-edge jet-flaps. In the present work, an attempt to model the vortex breakdown together with its control, above a delta wing at high angles of attack, for cases with and without a trailing-edge jet-flap, is presented. To model the turbulent stresses, the low-Reynolds-number stress-omega model was used. The computational results were in good agreement with the available experimental data regarding the prediction of the onset of vortex breakdown and showed that the use of jet-flaps can lead to a significant delay of the breakdown process.
ISSN:0142-727X
1879-2278
DOI:10.1016/j.ijheatfluidflow.2010.08.002