Fluid mechanics of dynamic stall part I. Unsteady flow concepts

Ericsson, L. E.; Reding, J. P.

doi:10.1016/s0889-9746(88)90116-8

Cited by 169 publications

(77 citation statements)

References 21 publications

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“…It is interesting to note that the vortex passage speed agrees reasonably with the numbers quoted by Lorber and Carta 5 and Ericsson and Reding. 13 Three regions can be identified for all cases investigated: 1) A region where the dynamic stall vortex forms and gathers strength, 2) a region where it convects along the surface and grows at the same time, and 3) a region where it grows rapidly and lifts off into the stream.…”

Section: Convection Velocity Of Dynamic Stall Vortexmentioning

confidence: 97%

Flow visualization studies of the Mach number effects on dynamic stall of an oscillating airfoil

Chandrasekhara

Carr

1990

Journal of Aircraft

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Compressibility effects on dynamic stall of a NACA 0012 airfoil undergoing sinusoidal oscillatory motion were studied using a stroboscopic schlieren system. Schlieren pictures and some quantitative data derived from them are presented and show the influence of freestream Mach number and reduced frequency on the dynamic stall vortex. This study shows that a dynamic stall vortex always forms and convects over the airfoil upper surface at approximately 0.3 times the freestream velocity for all cases studied. The results also demonstrate that occurrence of deep stall is delayed to higher angles of attack with increased reduced frequency, even when compressibility effects are present, but increasing Mach number alone has the opposite effect.

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Section: Convection Velocity Of Dynamic Stall Vortexmentioning

confidence: 97%

Flow visualization studies of the Mach number effects on dynamic stall of an oscillating airfoil

Chandrasekhara

Carr

1990

Journal of Aircraft

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“…It is likely that the hysteresis in the flow field around the Davis model can be explained based on the causes of dynamic stall on a pitching aerofoil as explained by Ericsson and Reding [21]. Dynamic stall is created by a combination of two effects caused by the model's motion and how this modifies the speed of onset flow over the model's surfaces.…”

Section: Figure 8 Regions Of Changes To the Dominant Frequenciesmentioning

confidence: 99%

Unsteady Aerodynamics of an Oscillating Fastback Model

Fuller¹,

Passmore²

2013

SAE Int. J. Passeng. Cars - Mech. Syst.

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This paper investigates the surface pressures found on the sides of a Davis model under steady state conditions and during yawed oscillations at a reduced frequency which would generally be assumed to give a quasi-static response. The surface pressures are used to investigate the flow field and integrated to infer aerodynamic loads. The results show hysteresis in the oscillating model's results, most strongly in the A-pillar flows. The changes to the flow field reduce strength of the flows around the rear pillars, reduce the strength and extent of the A-pillar vortex and cause the surface pressures to couple with the oscillating motion. This work shows the flows around the front of a vehicle may be more important to a vehicle's unsteady aerodynamics than is generally accepted and also leads to the conclusions that the reduced frequency parameter may not fully describe the onset unsteadiness.

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“…As outlined In Ref. 6, the effective angle of attack due to translation of the wing vertically may be characterized by two terms, one attributed to the velocity in the vertical direction, dz/dt, and the other due to self induced downwash.…”

Section: Time Lag and Motion Historiesmentioning

confidence: 99%

“…This is also apparent in the root chord bending moment data in Figs. [5][6][7][8][9][10][11][12] showing that the 'bending moment' stall occurs at the same angle of attack as the 'lift' and 'pitching moment' stall. What these data do not show is the mechanism for the stall in an unsteady flow field.…”

Section: Circulation Laamentioning

confidence: 99%

Downwash measurements on a pitching canard-wing configuration

Burkhalter

1993

Journal of Aircraft

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Fluid mechanics of dynamic stall part I. Unsteady flow concepts

Cited by 169 publications

References 21 publications

Flow visualization studies of the Mach number effects on dynamic stall of an oscillating airfoil

Flow visualization studies of the Mach number effects on dynamic stall of an oscillating airfoil

Unsteady Aerodynamics of an Oscillating Fastback Model

Downwash measurements on a pitching canard-wing configuration

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