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 Navier_x0002_Stokes (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.
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