An experimental study on the interaction between free-stream turbulence and a wing-tip vortex in the near-field

Ahmadi-Baloutaki, Mojtaba; Carriveau, Rupp; Ting, David S.‐K.

doi:10.1016/j.ast.2015.03.021

Cited by 13 publications

(14 citation statements)

References 33 publications

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“…This is despite the likely presence of high levels of unsteadiness in the vortex core, which was observed in the instantaneous vector fields, as well as being observed in other studies. 10,11,13,15,18 Selfsimilarity of a vortex for the same range of normalized radius in the presence of turbulence was also observed by Bailey et al 3 and Ahmadi-Baloutaki et al, 1 although these previous measurements were limited to the velocity field closer to the wing than in the present case.…”

Section: Self-similarity Of Mean Vortex Propertiessupporting

confidence: 79%

“…This proposed similarity in the core and logarithmic regions has been observed in both measured tangential velocity 3,28 and circulation. 1,8,28 External turbulence can also affect the vortex formation process, and hence its structure. Although the initial vortex formation a) Electronic mail: sean.bailey@uky.edu process is not grossly affected by the presence of turbulence, 3 the peak tangential velocity of the vortex has been observed to be reduced by 10% when the vortex forms in the presence of free-stream turbulence.…”

Section: Introductionmentioning

confidence: 99%

“…15 Note that no such reduction was observed in a more recent study by van Jaarsveld et al 33 Once the vortex forms, the rate of decay of the circulation contained within the vortex core has been found to be both independent of external turbulence 33 and dependent on it. 2,5,20,30 Furthermore, despite introducing unsteadiness and decay in the vortex core, 10,11,13,15,18 the self-similarity for the mean tangential velocity 1,3 and circulation 1,9 appears unaffected by the presence of external free-stream turbulence, at least in the near field.…”

Section: Introductionmentioning

confidence: 99%

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An experimental investigation of wing-tip vortex decay in turbulence

Ghimire

Bailey

2017

Physics of Fluids

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Particle image velocimetry measurements were conducted for a wing-tip vortex decaying in freestream turbulence. The vortex exhibited stochastic collapse with free-stream turbulence present, with the breakdown initiating earlier for higher levels of turbulence. An increased rate of decay of the vortex tangential velocity was also observed, increasing with increasing free-stream turbulence. The decay of the vortex tangential velocity without the free-stream turbulence was well represented by viscous diffusion, resulting in an increase in the core radius and decrease in the peak tangential velocity. With the addition of free-stream turbulence, the rate of decay of the peak tangential velocity of the vortex increases, whereas the rate of increase of core radius remains unchanged. The circulation of the vortex decayed in time when immersed in free-stream turbulence, whereas it remained approximately constant when free-stream turbulence was not present. This decay in circulation was found to be almost entirely due to a decrease in circulation of the vortex core, caused by the relative decrease in the peak tangential velocity without a corresponding increase in the core radius. The scaling of the radial profiles of velocity and circulation was also examined, and it was found that, regardless of the free-stream condition, the core was scaled by the peak tangential velocity and core radius. The region outside the core did not scale with these quantities, and an alternative scaling for circulation is proposed which results in improved collapse of the profiles.

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Section: Self-similarity Of Mean Vortex Propertiessupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An experimental investigation of wing-tip vortex decay in turbulence

Ghimire

Bailey

2017

Physics of Fluids

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“…Various studies have been conducted to investigate the effects of vortices on the aerodynamic characteristics (force and moments) of different bodies in the subsonic flow and at high angles of attack. [37][38][39][40][41]. Some different methods were applied to particle image velocimetry (PIV) data to study flow structures, vortex formation and its effects, and interactions on the other parts [42,43].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of angle of attack and tail deflection angle on the controlling tail flow field

Mokhtari

Shahrian

Langroodi

et al. 2020

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In the current study, the flow behavior due to the variation of the tail angle of attack and its deflection has been investigated on a body-tail with a controlling tail. Numerical computations were carried out at a constant velocity of 90 m/s with the tail angle of attack and deflection ranging from 0 to 30 degrees. It provides a deeper understanding of how the aerodynamics of the tail is influenced by the deflection of the tail and the variation of the angle of attack, along with body and nose vortices. The formation of structure and breakdown of vortices along with their effects on the pressure distribution over the tail and the corresponding normal force coefficients derived from the numerical results. As a result, due to increasing the angle of attack or the deflection angle, the high-pressure area extends over the surface of the controlling tail facing the flow. Besides, the effects of angles of attack on the normal force coefficients on the tail are more than deflection angles due to body effects and the corresponding generated vortices. A comparison of numerical results and experimental tests showed satisfying accuracy and provided reliable details on the flow behavior and the highest calculated error rate was 12.8%.

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“…Some of the recent experimental investigations include the work of Sun and Daichin [7], where the influence of the ground effect on the wing tip vortices was investigated on a NACA0012 wing. Ahmadi-Baloutaki et al [8] carried out experiments on the effect of the external free-stream turbulence in the near-field of a wing-tip vortex using hot-wire anemometry, which showed that the increase of the external free-stream turbulence tends to increase the vortex diffusion.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of wing tip vortices in the near-field

et al. 2019

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Results of an experimental investigation related to near-field wing tip vortices are presented. The measurements were carried out using a PIV-system in T-1K wind tunnel of KNRTU-KAI. Q-criterion and crosssectional lines method were used to determine vortex core locations, which showed a good agreement. It is shown that the circulation of tip vortices remains constant at low to moderate angles of attack, and decreases in the stream-wise direction for higher angles of attack. It is also shown that the vortex core radius increases in the stream-wise direction, taking larger values at higher angles of attack.

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An experimental study on the interaction between free-stream turbulence and a wing-tip vortex in the near-field

Cited by 13 publications

References 33 publications

An experimental investigation of wing-tip vortex decay in turbulence

An experimental investigation of wing-tip vortex decay in turbulence

Investigation of the effects of angle of attack and tail deflection angle on the controlling tail flow field

Experimental investigation of wing tip vortices in the near-field

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