Flow visualization study of a vortex/wing interaction

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National Aeronautics and Space Administration, Ames Research Center , Moffett Field, Calif
StatementR.D. Mehta and T.T. Lim
SeriesNASA technical memorandum -- 86656
ContributionsLim, T. T, Ames Research Center
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL14926941M

A Flow visualization study of a vortex/wing interaction book of the interaction between an initially columnar intake vortex (hereinafter referred to as the primary vortex) and vortex structures in the wake of a single sphere (hereinafter referred to as secondary vortices) is performed using a series of flow visualization experiments, in which a sphere is towed toward a stationary vortex with ambient axial flow and gradually decelerated to rest Cited by: 7.

Flow visualization study of a vortex-wing interaction. Vortex Flow Visualization using Colored and study of the vortex core structure and breakdown region. This interaction or Flow visualization study of a vortex/wing interaction book of the LEX and wing vortices has been noted by Hall (Reference 3) and LeMay (Reference 4) to delay breakdown at lower angles of attack.

However, this interaction has also been found to. Flow Visualization Vortex Breakdown Delta Wing Leading Edge Vortex Root Chord These keywords were added by machine and not by the authors.

This process is experimental and the keywords may be updated as the learning algorithm : Giorgio Guglieri, Michele Onorato, F.

Quagliotti. Visualization of Intricate Flow Structures for Vortex Breakdown Analysis The study of vortex breakdown is a field of its own in the fluid mechanics community. The corresponding literature mostly uses Delta wing This simulation describes a sharp-edged prismatic delta wing at subsonic speed ( mach) with the characteristic vor.

In this study, in order to clarify a vortex flow structure on a butterfly wing, we have carried out flow visualization on a butterfly wing using the particle and a high-speed camera. Experimental study of vortex flows over delta wings in wing-rock motion.

Terry Ng, Wing/vortex interactions and wing rock. Progress in Aerospace Sciences, Vol. 35, No. Flow visualization study of delta wings in wing-rock motion. The configuration used will affect the flow and vortex interaction that occurs. [2][3][4][5][6][7] [8] It becomes very important to understand the phenomenon of flow produced by a canard and the.

Computational Study of Wing-Wake Interactions between Ipsilateral Wings of Dragonfly in Flight Zongxian Liang1, lack of experimental and computational flow visualization studies on vortex dynamics and Figure 3 shows the time series of vortex structures of the flow.

vortex (e.g. Corsiglia et al. ; Ciffone & Orloff ) or through flow visualization (e.g. Lezius ; Sarpkaya ).

Description Flow visualization study of a vortex/wing interaction EPUB

The consensus of much of the scanning and free- flight work, established in the papers of Ciffone () and Iversen () is that tip vortices show little growth or decay over the first 20 or more spans downstream of the. Helium bubble flow visualizations have been performed to study perpendicular interaction of a turbulent trailing vortex and a rectangular wing in the Virginia Tech Stability Tunnel.

Many combinations of vortex strength, vortex-blade separation (Z(sub s)) and blade angle of attack were studied.

Photographs of representative cases are presented. experimental study simulating the interaction of streamwise wing-tip vortices with normal shock waves in a Mach 3 flow. Therefore, an experimental study was conducted to simulate the interaction of streamwise wing-tip vortices and normal shock waves (fig.1).

In this paper two recently developed visualization techniques are shown. The results. Interaction of a vortex with a blade, wing or fin may involve both rapid distortion of the incident vorticity field and unsteady flow near the surface.

A variety of flow visualization methods were applied in the experiment to observe the change of flow characteristics during a streamwise vortex–surface interaction. The distinguishing characteristics of the vortex formation and structure for different wing-tip configurations revealed by the visualization results were also confirmed by a quantitative Particle Image Velocimetry (PIV) measurement of the cross-flow velocity of the wing-tip trailing region and the aerodynamic force measurement of the model.

Flow visualization study of delta wings in wing-rock motion. By T. Terry Ng, which is noted to occur in the absence of asymmetric vortex liftoff, vortex breakdown, and static hysteresis, is seen to be initiated by flowfield asymmetries that are induced by flow disturbances and vortex interactions near the apex region; one vortex is thereby.

Detailed observations using Laser Induced Fluorescence (LIF) flow visualization lead Bernal et all7 to conclude that the surface motion induced by the vortex generated an uneven distribution of contaminant that in turn caused shear stress at the surface, generating secondary vorticity.

An experimental PIV study of the vortex interaction in the wake up to = 5 behind a two‐bladed model turbine of = m was performed by Lignarolo et al. 16 Their results emphasized the importance of the wake instability caused by a pairwise interaction of the tip vortices on the momentum deficit in the wake, which was shown to be strongly.

We combine a topology-based flow visualization method and volume rendering. In that way we achieve representations that both convey subtle flow structures and provide an intuitive understanding of their spatial context and associated physical properties.

Moving cutting planes are used that smoothly travel along prescribed trajectories. Comprehensive Study on Tip Vortex with Lateral Jet Flow. TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, Vol.

Details Flow visualization study of a vortex/wing interaction EPUB

46, No. Vortex-wing interaction of a close-coupled canard configuration. Eugene L. Tu ; Static and dynamic water tunnel flow visualization studies of a canard-configured XA-like fighter aircraft model.

The second range of `wing rock’ was observed primarily at the subsonic flow region, at much larger angles of attack, and Ross and Nguyen ascribed this to forebody vortex interaction with the wing (contrary to the `wing alone’ fluid mechanics). This subsonic wing-rock is the main topic of this study and the fluid dynamic observations during.

Flow visualization studies on flapping model dragonfly wings were conducted by Saharon and Luttges (, ), and it was shown that constructive or destructive wing/flow interactions might occur, depending on the kinematic parameters of the flapping motion.

The unsteady nature of the propeller-wing aerodynamic interaction has been studied using flow visualization. Studying the motion of the propeller tip vortex across the wing revealed that: the tip vortex was severed at the wing leading edge, the severed tip vortex filaments shear in a spanwise direction relative to one another, and these displaced filaments deform to reconnect at the trailing edge.


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1 University of Texas at Arlington low-speed wind-tunnel test setup for blade-vortex interaction (dimensions in inches).

ing rotor blade. The flow visualization study. Flow visualization studies on flapping model dragonfly wings were conducted by Saharon and Luttges6,7, and it was shown that constructive or destructive wing/flow interactions might occur, depending on the kinematic parameters of the flapping.

Flow visualization study of a vortex-wing interaction A flow visualization study in water was completed on the interaction of a streamwise vortex with a laminar boundary layer on a two-dimensional wing.

The vortex was generated at the tip of a finite wing at incidence, mounted perpendicular to the main wing, and having the same chord as the main wing. measurements, flow visualization studies by oil-flow and smoke were made at some Reynolds numbers. Three parameters were focused in this paper: outboard wing sweepback angles, inboard wing sweepback angles, and inboard / outboard wing kink locations.

The inboard vortex behaviors are strongly influenced by the. The present study examines the vortex flow over a sharp-edged deg delta wing with leading edge extension through simultaneous off-surface visualization and PIV measurement of the wing leeward flow region, and the wing-surface pressure measurement.

The present study. Previous studies suggested that Coriolis acceleration and spanwise flow both played key roles in stabilizing the leading-edge vortex (LEV) in revolving wings.

The current study examined a mechanism that relates the effects of Coriolis acceleration, spanwise flow, and the tilting of the planetary vorticity on removing the radial component of LEV.

(c) Flow visualization and image analysis. We filmed the vortex wake of the foil time ( Hz) and space resolved ( × pixels) as a function of (A*, λ*, α 0), and phase-locked over 99 periods; at stroke reversal and obtained interference fringes by illuminating the soap film with a monochromatic SOX lamp (Rutgers et al.

), which correlate strongly with the vorticity. There have been many attempts to improve the flying performance of a fighter. By modifying the flow that occurs along the fuselage is expected to improve the performance of the aircraft.

One of the indicators of combat aircraft performance is the ability to perform maneuver movement. Adding a canard as forewing on the fighter wing configuration is considered capable of raising the. Vortex flow, a major area of interest in fluid mechanics, is widespread in nature and in many man-made fluid mechanical devices.

It can create havoc as cyclones or tornadoes or have significant implications in the performance of turbo-fluid machines or supersonic vehicles and so forth.

Asymmetric vortices can cause a loss of lift and increase in rolling moment which can significantly affect.The horseshoe vortex system resulting from the interaction between a laminar boundary layer and a round transverse jet was studied over a range of Reynolds numbers and velocity ratios using hydrogen bubble wire visualization in a water channel.

The study shows that the horseshoe vortex system can be steady, oscillating, or coalescing, depending on the flow conditions.The present study is something of an extension to the previous study.

4 Potential vortex-shedding is investigated via vertical-plane smoke-wire flow visualization; a technique that has been used by many researchers. 6 –8 Smoke-wire flow visualization involves coating a thin metal wire with a solution that vaporizes as the wire is heated.