Abstract
—Formation of horseshoe vortex in the wing-body
junction region is the major contributing factor in aerodynamic
loses. Controlling horseshoe vortex using different schemes
including localized suction ahead of the wing is under investigation
for quite some time using wind tunnels and CFD techniques.
Studies have shown that RANS prediction of the junction flow
demonstrate a satisfactory qualitative comparison with
experimental results. Similarly, Reynolds-Averaged NavierStokes (RANS) based turbulence model Spalart Allmaras can
capture the basic flow features with and without localized suction
indicating a satisfactory qualitative comparison with reference
experiment for all suction rates. Localized suction is applied
through a suction hole and is a proven active technique in removal
of junction horseshoe vortex. The present study extends the CFD
analyses of junction flow with localized suction to investigate the
effects of suction hole parameters on formation of horseshoe
vortex in the junction region. In order to evaluate the effect of
suction hole location and dimensions on horseshoe vortex
formation, localized suction with varying suction velocities have
been applied through suction holes with two different dimensions
placed at two different distances from the model leading edge. It
has been observed that location of suction hole has a strong
influence on formation of horseshoe vortex. Positioning the suction
hole closer to the wing leading edge proves to be more effective in
elimination of horseshoe vortex as lower suction rates are required
to eliminate the vortex core as compared to the suction hole
positioned away from the leading edge. Moreover, bigger
dimensions of suction hole proved to be more effective in
controlling the horseshoe vortex as compared with the smaller
dimensions of suction hole.
Shakeel Ahmed, Abdullah Malik, Khalid Parvez. (2021) Effects of Suction Parameters on Junction Flow, Journal of Space Technology , Volume 11, Issue 1.
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