Wing-tip vortex dynamics at moderate Reynolds numbers

2021 ◽  
Vol 33 (3) ◽  
pp. 035111
Author(s):  
T. A. Smith ◽  
Y. Ventikos
Keyword(s):  
Vortex Dynamics ◽  
Reynolds Numbers ◽  
Tip Vortex ◽  
Wing Tip Vortex ◽  
Wing Tip

Influence of Tip Shape on Structure of Wing-Tip Vortex at Low Reynolds Numbers

2009 ◽  
Author(s):  
Djavad Kamari ◽  
Mehran Tadjfar
Keyword(s):  
Computational Study ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Tip Vortex ◽  
Low Reynolds Numbers ◽  
Naca0012 Airfoil ◽  
Wingtip Vortex ◽  
Wing Tip Vortex ◽  
Low Reynolds ◽  
Wing Tip

An important phenomenon in three-dimensional flow over a wing is the existence of wingtip vortex. It has significant effects on the aerodynamics of flying vehicles. In this computational study, we investigate the effects of geometry of the wingtip on the structure of the wing-tip vortices. Here, we consider a rectangular half-wing with NACA0012 airfoil as cross section. The aerodynamic coefficients and the flow-field variables are computed at low Reynolds numbers below 50,000. As the edge-shape parameter is increased the wing tip vortex is weakened. This influence is higher at higher values of Reynolds number. But, the increase of angle of attack does not change the shape or rate of this increase.

Mid-wake wing tip vortex dynamics with active flow control

2018 ◽  
Vol 98 ◽  
pp. 38-55 ◽  
Author(s):  
Marouen Dghim ◽  
Mohsen Ferchichi ◽  
Hachimi Fellouah
Keyword(s):  
Flow Control ◽  
Vortex Dynamics ◽  
Active Flow Control ◽  
Tip Vortex ◽  
Wing Tip Vortex ◽  
Active Flow ◽  
Wing Tip

Dynamics of the wing-tip vortex in the near field of a NACA 0012 aerofoil

2011 ◽  
Vol 115 (1166) ◽  
pp. 229-239 ◽  
Author(s):  
C. del Pino ◽  
J.M. López-Alonso ◽  
L. Parras ◽  
R. Fernandez-Feria
Keyword(s):  
Unstable Mode ◽  
Near Field ◽  
Reynolds Numbers ◽  
Tip Vortex ◽  
Vortex Centre ◽  
Wing Tip Vortex ◽  
Spatio Temporal ◽  
Naca 0012 ◽  
Proper Orthogonal ◽  
Wing Tip

AbstractThe dynamics of the wing tip vortex in the near-field of a NACA 0012 aerofoil has been analysed by means of flow visualisations in a water tunnel. Different axial distances near the wing up to four chords, Reynolds numbers up to 42,000 and three angles-of-attack are studied to characterise the behaviour of the vortex meandering. The spatio-temporal vortex centre positions show distorted elliptical shapes in a (x,y)-plane. The Reynolds number has no significant influence on the axial evolution of the meandering amplitude. In addition, the flow visualisations obtained with a low speed camera are analysed by the singular value or proper orthogonal decomposition. Thus, the most energetic displacement modes are obtained. The frequency associated to these modes is computed byFFT. In all the cases studied, our results show that the most unstable mode corresponds to the azimuthal wavenumber |n| = 1 in the so-called Kelvin helical modes and the frequency is lower or close to 1Hz.

Active Control of a Wing Tip Vortex

2005 ◽  
Author(s):  
David Greenblatt ◽  
LaTunia Melton ◽  
Chung-Sheng Yao ◽  
Jerome Harris
Keyword(s):  
Active Control ◽  
Tip Vortex ◽  
Wing Tip Vortex ◽  
Wing Tip

Investigations of a wing tip vortex in air by means of DPIV

1996 ◽  
Author(s):  
Andreas Vogt ◽  
Peter Baumann ◽  
Juergen Kompenhans ◽  
Morteza Gharib
Keyword(s):  
Tip Vortex ◽  
Wing Tip Vortex ◽  
Wing Tip

Numerical Study in Wing Tip Vortex for a Modified Commercial Boeing Aircraft

2008 ◽  
Author(s):  
Ricardo Hernandez-Rivera ◽  
Abel Hernandez-Guerrero ◽  
Cuauhtemoc Rubio-Arana ◽  
Raul Lesso-Arroyo
Keyword(s):  
Numerical Study ◽  
Tip Vortex ◽  
Total Drag ◽  
The Core ◽  
Induced Drag ◽  
Wing Tip Vortex ◽  
Drag And Lift ◽  
Wing Tips ◽  
Wing Tip ◽  
Constant Mach Number

Recent studies have shown that the use of winglets in aircrafts wing tips have been able to reduce fuel consumption by reducing the lift-induced drag caused by wing tip vortex. This paper presents a 3-D numerical study to analyze the drag and lift forces, and the behavior of the vortexes generated in the wing tips from a modified commercial Boeing aircraft 767-300/ER. This type of aircraft does not contain winglets to control the wing tip vortex, therefore, the aerodynamic effects were analyzed adding two models of winglets to the wing tip. The first one is the vortex diffuser winglet and the second one is the tip fence winglet. The analyses were made for steady state and compressible flow, for a constant Mach number. The results show that the vortex diffuser winglet gives the best results, reducing the core velocity of the wing tip vortex up to 19%, the total drag force of the aircraft up to 3.6% and it leads to a lift increase of up to 2.4% with respect to the original aircraft without winglets.

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