Pulsed vortex generator jets for active control of flow separation

McManus, Keith; Legner, Hartmut H.; Davis, Steven J.

doi:10.2514/6.1994-2218

Cited by 65 publications

(23 citation statements)

References 2 publications

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“…The pulsing frequency of 10 Hz was chosen for this investigation as this yields a Strouhal number of approximately 1, as recommended by Wygnaski and Seifert, 26 , Nagib et al, 48 , McManus et al, 55 , and others. This also means that the starting control vortex pulse is being convected over the surface with the same period as a passage disturbance or separated shear layer instability, (being close to 1/7 th of 100 Hz (15 Hz), and the passage reduced frequency of 13 Hz).…”

Section: Continuous and Pulsed Vortex Generator Jetsmentioning

confidence: 99%

Ultra High Work, High Efficiency Turbines For UAVs

Sondergaard¹

2006

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Section: Continuous and Pulsed Vortex Generator Jetsmentioning

confidence: 99%

Ultra High Work, High Efficiency Turbines For UAVs

Sondergaard¹

2006

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“…The VGJ was compared to the traditional solid vortex generator and found to produce similar benefits but without any additional tended to decay at a slightly faster rate downstream. 118,119,120,121,122 Additional research focused on the development of a pulsed vortex generator jet (PVGJ), which has been found to be more effective and efficient in delaying stall. [118][119][120][121][122] This is due to both the enhanced vorticity production associated with the impulsively started jet flow and to the reduction in mass flow due to a reduced duty cycle, or pulse cycle (typically 10% to 50%).…”

Section: Introductionmentioning

confidence: 99%

Active load control techniques for wind turbines.

Dam

Berg²,

Johnson

2008

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This report provides an overview on the current state of wind turbine control and introduces a number of active techniques that could be potentially used for control of wind turbine blades. The focus is on research regarding active flow control (AFC) as it applies to wind turbine performance and loads. The techniques and concepts described here are often described as "smart structures" or "smart rotor control". This field is rapidly growing and there are numerous concepts currently being investigated around the world; some concepts already are focused on the wind energy industry and others are intended for use in other fields, but have the potential for wind turbine control. An AFC system can be broken into three categories: controls and sensors, actuators and devices, and the flow phenomena. This report focuses on the research involved with the actuators and devices and the generated flow phenomena caused by each device. 4 Disclaimer:Given the nature of research in a progressive field such as wind energy, it is very difficult to mention every potential AFC device and to report precisely on all of the past and up-to-date findings. If a device or research paper is not mentioned within, it is because it was not found during the literature survey. Publications up through 2007 were used in this report. 5

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“…Pulsed VGJs were first considered by McManus et al (1994). The jets were reported to successfully prevent separation in an otherwise stalled two-dimensional diffuser.…”

Section: Vortex Generator Jets (Vgjs) For Active Flow Control (Afc)mentioning

confidence: 99%

Control of Separation for Turbulent Boundary Layers Subjected to Wall Curvature and Streamwise Pressure Gradients

Fasel¹

2005

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Pulsed vortex generator jets for active control of flow separation

Cited by 65 publications

References 2 publications

Ultra High Work, High Efficiency Turbines For UAVs

Ultra High Work, High Efficiency Turbines For UAVs

Active load control techniques for wind turbines.

Control of Separation for Turbulent Boundary Layers Subjected to Wall Curvature and Streamwise Pressure Gradients

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