Rotorcraft retreating blade stall control

Lorber, Peter F.; McCormick, D. C.; Anderson, Torger J.; Wake, Brian; MacMartin, Douglas G.; Pollack, Michael; Corke, Thomas; Breuer, Kenneth

doi:10.2514/6.2000-2475

Cited by 57 publications

(16 citation statements)

References 22 publications

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“…10 At present, however, the actuator authority is rather low ͑maximum jet velocity achieved to date is around 8 m/s͒. 11 The concept of using plasma to control dynamic stall seems to be introduced by Lorber et al 12 A detailed study on a NACA 0015 airfoil oscillating in pitch was followed by Post and Corke 13 with a plasma actuator located at the leading edge. While a small increase in lift occurred throughout the pitch-up cycle with plasma in steady operation, the dynamic stall vortex was suppressed by the plasma and the associated lift was negligible.…”

Section: Introductionmentioning

confidence: 98%

Control of unsteady flow separation over a circular cylinder using dielectric-barrier-discharge surface plasma

Jukes

Choi

2009

Physics of Fluids

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Dielectric-barrier-discharge plasma actuators have been used to control the unsteady flow separation over a circular cylinder at Re= 15 000 with a view to maximizing the lift with a minimum drag increase. The flow structure was studied using time-resolved particle image velocimetry and flow visualization, while the dynamic lift and drag were simultaneously measured with a two-component force balance. Our results show that the lift can be dramatically increased by a single, short-duration pulse of plasma at carefully chosen location and timing. A peak lift coefficient of 1.24 was observed, showing that the plasma can increase lift by over 300%, with less than 25% increase in drag. Optimal conditions occurred when the actuator was located at 75°from the streamwise axis, with plasma forcing timed to coincide with the retreat of the separation point. This corresponds to the actuator being located 7°upstream of the natural separation point. The peak lift was relatively insensitive to the duration of the plasma.

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Section: Introductionmentioning

confidence: 98%

Control of unsteady flow separation over a circular cylinder using dielectric-barrier-discharge surface plasma

Jukes

Choi

2009

Physics of Fluids

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“…The authors claim that paraelectric forces associated to electric field gradients enable ion acceleration and via particle collision acceleration of the neutral particles. Other devices like the OAUGDP but with a polyphase RF power have been presented recently [23][24] .…”

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confidence: 99%

Flow Control with Electrohydrodynamic Actuators

Artana¹,

D’Adamo²,

Léger³

et al. 2002

AIAA Journal

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This work analyses the ability of an electrohydrodynamic actuator to modify the characteristics of a flow over a flat plate. The device considered uses flush mounted electrodes and a d.c. power supply to create a plasma sheet on the surface of the plate. We analyze the mechanism of formation of this plasma sheet, which is shown to be similar to the streamer formation. We show flow visualizations at low flow velocities (≈1m/s) and results from Particle Image Velocimetry at higher flow velocities (range 11.0-17.5 m/s). These results show that the discharge can induce an important acceleration of the flow close to the surface.

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“…Dynamic stall on rotorcraft retreating blades results in dramatic loss of lift and large pitching moments, which transmit excessive and damaging impulsive loads to the fl ight control system and airframe (Lorber et al, 2000). A dominant feature is the DSV, mentioned in the preceding section and often referred to as "bubble bursting," which is generated when the blade pitches at a suffi ciently high pitch rate beyond its static-stall angle (Carr, 1988).…”

Section: Incompressible Dynamic Stall Controlmentioning

confidence: 99%