Lift modulation with lateral wing-tip blowing

Tavella, Domingo; Wood, N. J.; Lee, C. S.; Roberts, Leonard

doi:10.2514/3.45565

Cited by 16 publications

(3 citation statements)

References 7 publications

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“…Blowing has been studied more, probably as it is a more viable means of flow control. Studies have concentrated on the use of high aspect ratio jets blowing in the spanwise direction (7,8) as a means of increasing the span, or low aspect ratio jets (9,10) in an attempt to alter the flowfield around the tip. Both studies have produced promising results showing that blowing implemented near the tip can influence the flow favourably.…”

Section: Methodsmentioning

confidence: 99%

Wing tip vortex control using synthetic jets

Margaris

Gursul

2006

Aeronaut. j.

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An experimental investigation was conducted to study the effect of synthetic jet (oscillatory, zero net mass flow jet) blowing near the wing tip, as a means of diffusing the trailing vortex. Velocity measurements were taken, using a Particle Image Velocimetry system, around the tip and in the near wake of a rectangular wing, which was equipped with several blowing slots. The effect of the synthetic jet was compared to that of a continuous jet blowing from the same configurations. The results show that the use of synthetic jet blowing is generally beneficial in diffusing the trailing vortex and comparable to the use of continuous jet. The effect was more pronounced for the highest blowing coefficient used. The driving frequency of the jet did not generally prove to be a significant parameter. Finally, the instantaneous and the phase-locked velocity measurements helped explain the different mechanisms employed by the continuous and synthetic jets in diffusing the trailing vortex.

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Section: Methodsmentioning

confidence: 99%

Wing tip vortex control using synthetic jets

Margaris

Gursul

2006

Aeronaut. j.

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“…This is a major reason for the pressure decrease of the primary vortex shown in Figure 11(a). It appears that the normal blowing from the lower surface acts as a virtual wingtip plate to restrain the rolling up of the primary vortex on the upper surface, which is like span-wise blowing [25].…”

Section: Control Effect Of Normal Blowingmentioning

confidence: 99%

“…In more recent years, documented literatures show that active flow control (AFC) approach possesses greater potentials for improving the performance of aircrafts. Various research has been conducted on active flow control of the wingtip vortex using applications such as plasma [21,22], zero mass jet [23], and blowing [24][25][26][27][28][29][30][31]. Related research results [21,27,32,33] show that span-wise excitation promotes the vortex core to move further away from the wing by increasing the effective span-wise length of the wing.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES

Jiang

Wang

Qin

et al. 2021

International Journal of Aerospace Engineering

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The characteristics and control of a wingtip vortex are of great significance when considering drag reduction and flight safety of transportation aircrafts. The associated aerodynamic phenomenon resulting from rolling up of a wingtip vortex includes boundary layer flow, shear layer separation, and vortex breakdown, while the interaction of a wingtip vortex with the airframe causes induced drag, wingtip noise, etc. This paper studies a normal blowing method utilized to control the wingtip vortex. Large eddy simulation (LES) technique applied to a straight NACA0012 wing having a chord length ( c ) of 0.4 m is adopted for this study. The Reynolds number based on the chord length is 1.6 × 10 6 and the angle of attack is 12°. The computational approach utilized the dynamic Smagorinsky-Lilly subgrid model for 3D simulations. Normal blowing from a high aspect ratio jet from the wingtip lower surface was used to control the wingtip vortex. From 0.05c to 0.30c, the blowing slit width was 1 mm, with the slit exit treated as a velocity inlet boundary condition which supplied the blowing jet with a momentum coefficient of 0.28%. Results of axial velocity and span-wise pressure distribution of the clean airfoil presented good agreement with known experimental data. LES results indicate that normal blowing suppresses the primary vortex strength, while the vortex core radius, maximum induced velocity, axial vorticity flux, and pressure peak of the primary vortex are reduced by 25%, 28%, 46%, and 52%, respectively. Flow field structures before and after blowing show that blowing suppresses the shedding, coiling, and convergence of the free vortex layers near the primary vortex. This study also shows that normal blowing generates a jet-induced vortex at the location of the secondary vortex, while backflow, volume expansion, and spiral burst can be observed in the jet-induced vortex. The bursting jet-induced vortex destroys the jet-like flow structure of the primary vortex at the trailing edge.

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Introduction to Flow Control

Gad‐el‐Hak

Flow Control

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Lift modulation with lateral wing-tip blowing

Cited by 16 publications

References 7 publications

Wing tip vortex control using synthetic jets

Wing tip vortex control using synthetic jets

Investigation of the Normal Blowing Approach to Controlling Wingtip Vortex Using LES

Introduction to Flow Control

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