Unsteady vortex dynamics and surface pressure topologies on a finite pitching wing

Schreck, S.; Helin, H. E.

doi:10.2514/3.46577

Cited by 59 publications

(40 citation statements)

References 13 publications

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“…[10,13] Finally, between locations A and C, the vortex forms an arch over the central portion of the wing, with the apex located near B. Vortex convection velocity was substantially faster at B than it was at A or C, due to increased exposure to the freestream flow. Notably, the shape and location of the vortex between A and C recapitulates the vortex topology presented in Figure 13.…”

Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 99%

“…However, detailed surface pressure data, analogous to that documented herein for the turbine blade, exist for a three-dimensional wing pitching in a wind tunnel. [13] Furthermore, the vortical flow field over the pitching wing has been thoroughly visualized and the fluid dynamics are well understood. Comparative analyses enable knowledge regarding wing vortex structure and dynamics to be extrapolated to the wind turbine blade.…”

Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 99%

“…The flow field for the rectangular wing has been extensively visualized [13], and one panel from the sequence is shown in Figure 15. In this photograph, heavy black lines near the periphery of the photograph bound the wing planform.…”

Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 99%

“…They noted vortex straining and pinning analogous to that at the tip, as well as similarly enhanced and prolonged lift generation. Unified comprehension of the vortex dynamics governing the root, midspan, and tip regions was provided by Schreck and Helin [13], by combining flow visualization with surface pressure topologies. In addition to vortex pinning near the wing tip and root, these experiments revealed radical vortex deformation near the wing midspan associated with dramatic spatial and temporal lift fluctuations.…”

Section: Aiaa 2000-0040mentioning

confidence: 99%

See 3 more Smart Citations

HAWT dynamic stall response asymmetries under yawed flow conditions

Schreck

Robinson

Hand

et al. 2000

2000 ASME Wind Energy Symposium

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Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 99%

Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 99%

Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 99%

Section: Aiaa 2000-0040mentioning

confidence: 99%

See 2 more Smart Citations

HAWT dynamic stall response asymmetries under yawed flow conditions

Schreck

Robinson

Hand

et al. 2000

2000 ASME Wind Energy Symposium

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“…Literature on three-dimensional, heaving and pitching foils was not found, but experiments on three-dimensional foils performing either heaving or pitching, show similar phenomena of fluid dynamics [11,14].…”

Section: Introductionmentioning

confidence: 99%

Oscillating foils for ship propulsion

Mattheijssens¹,

Marcel²,

Bosschaerts³

et al. 2012

WIT Transactions on Ecology and the Environment

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The high propulsive efficiency, the fast manoeuvrability and the low noise production of the propulsion of marine animals inspired the development of a new ship propeller. This text describes the design of a flapping foil ship propeller and the experiments performed on it. The flapping foil propeller mimics the tail fin of fish that swim at high speed, like tunas or sharks, in at least two ways: the hydrodynamics and the resonant driving mechanism. The motion of the foil is a combination of a heaving and a pitching oscillation, with a phase difference. The wake behind the tail of a fish has a special structure called the reversed von Karman street. If the motion parameters are well chosen, the wake behind the flapping foil has a similar structure, resulting in positive thrust force and high propulsive efficiency. The driving mechanism uses flexibility to exclude the need for one of the two actuators. The influence of the free surface and the oscillation frequency on the performance are investigated.

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CFD analysis of an oscillating wing at various reduced frequencies

Farooq

Hamdani

Anwar-ul-Haque³

et al. 2008

Numerical Methods in Fluids

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SUMMARYThe effect of various reduced frequencies has been examined for an oscillating aspect ratio 10 NACA 0015 wing. An unsteady, compressible three-dimensional (3D) Navier-Stokes code based on Beam and Warming algorithm with the Baldwin-Lomax turbulence model has been used. The code is validated for the study against published experimental data. The 3D unsteady flow field is simulated for reduced frequency values of 0.1, 0.2 and 0.3 for a fixed mean angle of attack position and fixed amplitude. The type of motion is sinusoidal harmonic. The force coefficients, pressure distributions and flow visualization show that at the given conditions the flow remains attached to the wing surface even at high angles of attack with no clear separation or typical light-to-deep category of dynamic stall. Increased magnitude of hysteresis and higher gradients are seen at higher reduced frequencies. The 3D effects are even found at midspan locations. In addition, the rate of decrease in lift near the wing tips compared with the wing root is not much like in the static cases.

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Unsteady vortex dynamics and surface pressure topologies on a finite pitching wing

Cited by 59 publications

References 13 publications

HAWT dynamic stall response asymmetries under yawed flow conditions

HAWT dynamic stall response asymmetries under yawed flow conditions

Oscillating foils for ship propulsion

CFD analysis of an oscillating wing at various reduced frequencies

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