Controlled three-dimensionality in unsteady separated flows about a sinusoidally oscillating flat plate

Hörner, Michael; Addington, Gregory; Young, J. R.; Luttges, Marvin W.

doi:10.2514/6.1990-689

Cited by 15 publications

(7 citation statements)

References 3 publications

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“…Three-dimensional DS on finite wings is essentially characterised by the interaction of the tip vortices and the DS vortex which results in the emergence of a localised omega-shaped separation region in the midspan section of the wing [10,11,12,13]. The DS vor-tex arches away from the wing surface as a result of its spanwise non-uniform emergence and development.…”

Section: Introductionmentioning

confidence: 99%

Dynamic stall on a fully equipped helicopter model

Mülleners

Kindler

Raffel

2012

Aerospace Science and Technology

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Three-dimensional dynamic stall was observed on the rotor of a fully equipped subscale helicopter model in a wind tunnel. Results of stereoscopic particle image velocimetry measurements on the retreating blade clearly revealed the large-scale dynamic stall vortex at 50% and 60% blade radius. The small-scale shear layer vortices that constitute the large-scale dynamic stall vortex were identified and localised. Based on the spatial distribution of these smallscale vortices, the characteristic large-scale structure was found to be unexpectedly compact. Along with an apparent spanwise flexion of the dynamic stall vortex, these results suggested the rotational motion of the rotor to have a stabilising effect on the formation and convection of the dynamic stall vortex. The velocity field information available provides a basis for validating recent computational fluid dynamics results of three-dimensional dynamic stall.

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Section: Introductionmentioning

confidence: 99%

Dynamic stall on a fully equipped helicopter model

Mülleners

Kindler

Raffel

2012

Aerospace Science and Technology

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“…Nevertheless, shortly after formation the vortex is shown to achieve this state of uniformity for a short period. Subsequently, however, the dominant three-dimensional effects distort the vortex into an 'omega'< 24 > shape and the conventional reasoning of the straight convecting vortex no longer applies.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of dynamic stall on a finite wing

Coton

Galbraith

1999

Aeronaut. j.

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This paper examines the dynamic stalling of a finite wing of aspect ratio 3·0 when subject to constant pitch motions up to and beyond stall. In particular, unsteady surface pressure data were obtained at 192 locations on the wing surface and these were then analysed to provide information on the nature and phasing of dynamic stall events in both the chordwise and spanwise directions. It was also possible to obtain sectional force and moment coefficients by integration of the pressures measured on specific chordal arrays. This provided valuable insight into the load distribution on the wing throughout the range of motion. On this basis, it was established that the wing loading distribution was consistent with conventional understanding of steady wing loading up to the incidence at which the dynamic stall vortex was initiated. Beyond this point, the formation and subsequent convection of the vortex structure was found to be strongly three-dimensional but, nevertheless, exhibited many of the features of two-dimensional dynamic stall.

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“…Similar three-dimensional vortex structures have been documented for lifting surfaces undergoing diverse pitching motions. 9,14,37,38 In addition, analogous vorticity concentrations have been observed on stationary wings of high aspect ratio. 39…”

Section: Turbine Blade Vortex Structure and Dynamicsmentioning

confidence: 74%