Airfoil tip vortex formation noise

AIAA Journal ◽  
1986 ◽  
Vol 24 (2) ◽  
pp. 246-252 ◽  
Author(s):  
Thomas F. Brooks ◽  
Michael A. Marcolini
Keyword(s):  
Vortex Formation ◽  
Tip Vortex

DTNS3D Computer Code Simulation of Tip-Vortex Formation: RANS Code Validation

1997 ◽  
Author(s):  
John G. Telste ◽  
Roderick M. Coleman ◽  
Joseph J. Gorski
Keyword(s):  
Vortex Formation ◽  
Computer Code ◽  
Tip Vortex ◽  
Code Validation

Experimental Investigation of Tip Vortex Formation Noise Produced by Wall-Mounted Finite Airfoils

2021 ◽  
Vol 34 (6) ◽  
pp. 04021079
Author(s):  
Tingyi Zhang ◽  
Thomas Geyer ◽  
Charitha de Silva ◽  
Jeoffrey Fischer ◽  
Con Doolan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Vortex Formation ◽  
Tip Vortex

Numerical Experiments for Flow Around a Ducted Tip Hydrofoil

2002 ◽  
Author(s):  
Hildur Ingvarsdo´ttir ◽  
Carl Ollivier-Gooch ◽  
Sheldon I. Green
Keyword(s):  
Turbulence Model ◽  
Vortex Core ◽  
Vortex Flow ◽  
Computational Study ◽  
Near Field ◽  
Vortex Formation ◽  
Tip Vortex ◽  
Navier Stokes ◽  
Computational Studies ◽  
Tip Vortices

The performance and cavitation characteristics of marine propellers and hydrofoils are strongly affected by tip vortex behavior. A number of previous computational studies have been done on tip vortices, both in aerodynamic and marine applications. The focus, however, has primarily been on validating methods for prediction and advancing the understanding of tip-vortex formation in general, rather than showing effects of tip modifications on tip vortices. Studies of the most relevance to the current work include computational studies by Dacles-Mariani et al. (1995) and Hsiao and Pauley (1998, 1999). Daeles-Mariani et al. carried out interactively a computational and experimental study of the wingtip vortex in the near field using a full Navier-Stokes simulation, accompanied with the Baldwin-Barth turbulence model. Although they showed improvement over numerical results obtained by previous researchers, the tip vortex strength was underpredicted. Hsiao and Pauley (1998) studied the steady-state tip vortex flow over a finite-span hydrofoil, also using the Baldwin-Barth turbulence model. They were able to achieve good agreement in pressure distribution and oil flow pattern with experimental data and accurately predict vertical and axial velocities of the tip vortex core within the near-field region. Far downstream, however, the computed flow field was overly diffused within the tip vortex core. Hsiao and Pauley (1999) also carried out a computational study of the tip vortex flow generated by a marine propeller. The general characteristics of the flow were well predicted but the vortex core was again overly diffused.

scholarly journals Dataset on tip vortex formation noise produced by wall-mounted finite airfoils with flat and rounded tip geometries

Data in Brief ◽  
2020 ◽  
Vol 28 ◽  
pp. 105058
Author(s):  
Tingyi Zhang ◽  
Danielle Moreau ◽  
Thomas Geyer ◽  
Jeoffrey Fischer ◽  
Con Doolan
Keyword(s):  
Vortex Formation ◽  
Tip Vortex

Noise due to tip vortex formation on lifting rotors

1980 ◽  
Author(s):  
A. GEORGE ◽  
F. NAJJAR ◽  
Y. KIM
Keyword(s):  
Vortex Formation ◽  
Tip Vortex

Airfoil tip vortex formation noise

1984 ◽  
Author(s):  
T. BROOKS ◽  
M. MARCOLINI
Keyword(s):  
Vortex Formation ◽  
Tip Vortex

scholarly journals Role of the tip vortex in the force generation of low-aspect-ratio normal flat plates

2007 ◽  
Vol 581 ◽  
pp. 453-468 ◽  
Author(s):  
MATTHEW J. RINGUETTE ◽  
MICHELE MILANO ◽  
MORTEZA GHARIB
Keyword(s):  
Aspect Ratio ◽  
Vortex Formation ◽  
Three Dimensional ◽  
Unsteady Motion ◽  
Tip Vortex ◽  
Flat Plates ◽  
Low Aspect Ratio ◽  
Start Up ◽  
Image Velocimetry

We investigate experimentally the force generated by the unsteady vortex formation of low-aspect-ratio normal flat plates with one end free. The objective of this study is to determine the role of the free end, or tip, vortex. Understanding this simple case provides insight into flapping-wing propulsion, which involves the unsteady motion of low-aspect-ratio appendages. As a simple model of a propulsive half-stroke, we consider a rectangular normal flat plate undergoing a translating start-up motion in a towing tank. Digital particle image velocimetry is used to measure multiple perpendicular sections of the flow velocity and vorticity, in order to correlate vortex circulation with the measured plate force. The three-dimensional wake structure is captured using flow visualization. We show that the tip vortex produces a significant maximum in the plate force. Suppressing its formation results in a force minimum. Comparing plates of aspect ratio six and two, the flow is similar in terms of absolute distance from the tip, but evolves faster for aspect ratio two. The plate drag coefficient increases with decreasing aspect ratio.

scholarly journals On the persistence of memory: do initial conditions impact vortex formation?

2013 ◽  
Vol 736 ◽  
pp. 91-106 ◽  
Author(s):  
Jochen Kriegseis ◽  
Matthias Kinzel ◽  
David E. Rival
Keyword(s):  
Particle Tracking Velocimetry ◽  
Initial Conditions ◽  
Vortex Formation ◽  
Three Dimensional ◽  
Force Production ◽  
Initial Boundary ◽  
Tip Vortex ◽  
Stream Velocity ◽  
Force Measurements ◽  
Effective Velocity

AbstractAn investigation into redistribution of vorticity for rapidly accelerating plates with varying kinematics and initial conditions has been performed. Both three-dimensional particle tracking velocimetry and direct force measurements were applied simultaneously. The effective velocity of the feeding shear layer has been identified as the appropriate characteristic velocity rather than the commonly used plunge or free stream velocity. Based on this new normalization for circulation, it has been demonstrated that the existence of initial boundary-layer vorticity on the plunging plate – at least in the near-midplane region – does not contribute to the eventual vortex formation process. In accordance with the literature, however, the tip vortex positioning relative to the plate surface has been identified as an important contributor in the overall force production, particularly once the plate acceleration has ceased.

Effect of dielectric barrier discharge on wing-tip vortex formation

2011 ◽  
Vol 37 (11) ◽  
pp. 1070-1073 ◽  
Author(s):  
S. A. Agibalova ◽  
V. V. Golub ◽  
I. A. Moralev ◽  
A. S. Saveliev
Keyword(s):  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Vortex Formation ◽  
Tip Vortex ◽  
Dielectric Barrier ◽  
Wing Tip Vortex ◽  
Wing Tip
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