Turbulent junction flow with an upstream ribbed surface

Kairouz, Khalil; Rahai, Hamid

doi:10.1016/j.ijheatfluidflow.2005.02.002

Cited by 14 publications

(4 citation statements)

References 8 publications

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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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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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“…Kairouz and Rahai (2005) proposed using longitudinal triangular riblets within a turbulent boundary layer upstream of a wing-body junction. Based on the velocity measurements carried out at the wing mid-chord and downstream, they found that the ribbed surface weakens the strength of the horseshoe vortices and displaces them away from the junction [10]. Active control of the upstream boundary layer by suction or blowing has also been the subject of investigations .…”

Section: Introduction 11 Introductionmentioning

confidence: 99%

Effects of an upstream triangular plate on the wing-body junction flow

Théberge

Ekmekci

2017

Physics of Fluids

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The use of a short triangular leading-edge plate at the base of a wing-body junction is experimentally evaluated as a passive control method to mitigate horseshoe vortices. The impact of the plate geometry on the efficacy of the control is assessed by considering triangular plates that vary in length and thickness. The wing model is a NACA 0020 airfoil. The Reynolds number based on the chord length is varied from Re c = 25, 000 to 75, 000. The incoming boundary layer is laminar. Particle Image Velocimetry is utilized to characterize the temporal behavior and circulation strength of horseshoe vortices. All the triangular plates considered are found to decrease the circulation strength of the horseshoe vortices in the plane of symmetry by varying degrees compared to the uncontrolled configuration. Among the plates considered in this study, the results show that the longer and thinner the plate, the better the vortex mitigation. Overall, the proposed method provides an effective way to mitigate horseshoe vortices at wing-body junctions.

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“…Therefore, upstream surface suction could mitigate some of the adverse effects induced by the horseshoe vortices. Kairouz and Rahai (2005) installed upstream longitudinal triangular ribs on the surface ahead of a wing-surface junction and found that the ribs displaced the location of the horseshoe vortex away from the corner and reduced its strength. Wei et al (2008) examined the boundary-layer flows around the cylinder-surface junction by using cylinders of three cross-sectional shapes (square, circular, and rhombus).…”

Section: Introductionmentioning

confidence: 99%