Comparative study of the elimination of the wing fuselage junction vortex by boundary layer suction and blowing

Johnson, C.M.; Ravindra, K.; Andres, R.

doi:10.2514/6.1994-293

Cited by 13 publications

(3 citation statements)

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“…Philips et al [11] used a suction slot and found disappearance of the large-scale horseshoe vortex. Johnson et al [12] also examined the role of blowing through the upstream hole. They found that, with increasing blowing rate, the formation of the horseshoe vortex was delayed.…”

Section: Introductionmentioning

confidence: 98%

Strengths of horseshoe vortices around a circular cylinder with an upstream cavity

2009

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Horseshoe vortices are formed at the junction of an object immersed in fluid-flow and endwall plate as a result of three-dimensional boundary layer separation. This study presents the variation of the strengths of such horseshoe vortices around a circular cylinder with a cavity (slot) placed upstream. Through the cavity, no mass flow addition (blowing) or reduction (suction) is applied. With the upstream cavity, adverse pressure gradient is weakened upstream of the cavity whereas it is strengthened downstream of the cavity. Furthermore, a single vortex system is found to form immediately upstream of the cylinder instead of a typical two vortex (primary and secondary vortices) system observed in the absence of the upstream cavity. The strength of the primary vortex is weakened due to the fluid stream engulfed in to the upstream cavity, resulting in diffusion of the mainstream. Consequently, the circulation of the primary vortex is weakened.

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Section: Introductionmentioning

confidence: 98%

Strengths of horseshoe vortices around a circular cylinder with an upstream cavity

2009

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“…A vast amount of scientific literature [6][7][8][9][10][11][12][13] has addressed the task of reducing the drag caused by junction flow phenomena with both passive and active techniques. The most studied and used solutions are the leading-edge fairing and the whole-body fairing.…”

Section: Introductionmentioning

confidence: 99%

A Review of Numerical and Experimental Studies of the Anti-Fairing

Belligoli

Dwight

Eitelberg

et al. 2020

Aiaa Aviation 2020 Forum

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An anti-fairing is a concave deformation of the wall around a wing-body junction that can decrease the aerodynamic drag through the activation of a propulsive force generated by the interaction of the curved concave shape and the high-pressure region in proximity of the wing leading-edge. Although this mechanism is well understood, the dynamics of the interaction between the anti-fairing and the junction flow remain largely unexplored. This work brings together all the numerical and experimental studies of the anti-fairing to investigate its effect on turbulent quantities and the robustness of its design to changes to the incoming flow parameters, and to estimate the drag change with respect to a normal wing/flat-plate configuration. It is found that the interaction of the streamwise pressure gradient generated by the anti-fairing with the incoming boundary layer substantially reduces the shear responsible for viscous drag. Furthermore, no significant influence of the incoming boundary layer thickness on the antifairing performance is observed. However, a direct drag measurement with a force balance casts some doubts on the possibility to achieve large drag reductions.

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“…The design of suction system was based on the work of Philips 6 , Barberis 7 and Johnson 8 . The general arrangement of the suction system is shown in Fig.…”

Section: The Suction Systemmentioning

confidence: 99%