Experimental Investigation of Aerodynamic Devices for Wind Turbine Rotational Speed Control: Phase I

Miller, L. Scott

doi:10.2172/33112

Cited by 10 publications

(9 citation statements)

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“…A brief history of employment of trailing edge flaps on wind turbine can be found in literature [35][36][37]. This concept of applying aerodynamic devices has then been revived with more advanced technology in place and it is taking shape in current wind turbine research field.…”

Section: Aerodynamic Devicesmentioning

confidence: 99%

Fatigue Loads Mitigation on Horizontal Axis Wind Turbines Using Aerodynamic Devices. A Survey

Muiruri¹,

Motsamai²

2017

JESTR

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The paper presents overview of source loads and aerodynamic techniques that are feasible for fatigue load reduction on large horizontal axis wind turbines. The article highlights the effects of increasing wind turbine rotor diameter on fatigue load, and feasible aerodynamic techniques that can be employed to reduce fatigue load. Increased in fatigue load is critical as current and future horizontal wind turbines are designed of large rotor blades. Increase in size of wind turbines has been elicited by highly demand for clean energy nowadays as well as need to decrease the cost of energy per kilo watt. As the rotor diameter increases in size, so do effects of air loads acting on the blades. The pitch control systems installed with a purpose of controlling such effects are approaching their capability limits. They are unable to dump sudden, high varying air loads associated with fluctuating wind speed on time. As these effects occur repeatedly during operation of wind turbines, they can cause premature failure or permanent damage of major components due to fatigue load accumulation. In overall, the service life of wind turbine can drastically reduce or high operational and maintenance costs are likely to rise up due to frequent downfalls of unplanned maintenance schedules. Therefore, alternative methods rather than pitch control are reviewed that can improve wind turbines efficiency. The paper concludes by analyzing possible opportunities in future.

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Section: Aerodynamic Devicesmentioning

confidence: 99%

Fatigue Loads Mitigation on Horizontal Axis Wind Turbines Using Aerodynamic Devices. A Survey

Muiruri¹,

Motsamai²

2017

JESTR

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“…examined the performance of ailerons at different configurations. 25,26 Field tests also were performed using the aileron device at fixed positions (no active control), during which 3-D effects associated with variable span-wise deployment of the control devices were identified during turbine operation. 27 Stuart, Wright, and Butterfield 28,29 discuss the possible advantages of active devices for turbine control to mitigate the effects of damaging loads.…”

Section: Descriptionmentioning

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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“…Investigators haved focused on identifying device configurations that produce reasonable braking capabilities, subject to simplicity of construction, ease of actuation, and operational reliability considerations. Indeed, a number of different configurations have been evaluated in wind tunnel tests (Quandt 1994, Miller 1995, Griffin 1996, Ramsay, Janiszewska, and Gregorek 1996.…”

Section: Previous Related Workmentioning

confidence: 99%

“…As was the case for previous wind tunnel models (Miller 1995 and1996), these parts simply bolted into position on the common blade trailing edge and cove so as to create the geometry desired. Most of the instrumentation and device hinge mechanisms were also covered in the process.…”

Section: Strain-gaged Torque Tube Formentioning

confidence: 99%

Atmospheric tests of trailing-edge aerodynamic devices

Miller¹,

Huang

Quandt³

1998

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• • .: Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste ForewordThe Wind Technology Division of the National Renewable Energy Laboratory (NREL) is conducting exploratory research on aerodynamic devices that are intended to enhance wind-turbine rotor performance and attenuate structural loads. Desired properties of these devices include simplicity, reliability, maintainability, low cost and fail-safe design. Initial efforts have focused on the use of trailing-edge aerodynamic brakes for overspeed protection. Long-term efforts will address more aggressive and innovative strategies that have the potential to significantly advance the state of the art.The first two research projects proceeded in parallel, with considerable interaction between the principal investigators:Subcontract No. TAD-3-13400 entitled "Wind Turbine Trailing-Edge Aerodynamic Brake Design" performed by Gene A. Quandt, and Subcontract No. XAD-3-133365 entitled "Aerodynamic Devices for Wind Turbine Performance Enhancement" performed by Wichita State University (WSU).The WSU Phase-1 Report discussed the configurations studied and the attempts to identify promising alternatives through the analysis of the wind tunnel test data. The Phase-2 Report presented wind tunnel results for "spoiler-flaps" of 30%, 40% and 50% chord; for various leading-edge lip extensions; for different venting arrangements; and for different device hinge locations. Gene Quandt's subcontract report, No. TP-441-7389, focused on aerodynamic and structural design, and included preliminary design calculations for a centrifugally-actuated aerodynamic brake.As is often the case with exploratory research, these projects spawned additional follow-on studies. Wind-tunnel tests were conducted at Ohio State University (OSU) in which a pressure-tapped S809 airfoil model was tested with three trailing-edge devices: the spoiler-flap, a plain flap ("unvented aileron") and a vented plain flap ("vented aileron"). In Subcontract No. XAX-5-15217-0 entitled "Investigation of Trailing-Edge Aerodynamic Brakes", rotating-blade tests of these same configurations were conducted at the National Wind Technology Center (NWTC) with the goal of quantifying the effects of unsteadiness, blade rotation and aspect ratio, so that corrections might be applied to wind-tunnel test data for use by wind-turbine designers in the future. The results of that effort are contained in the present report. PrefaceThe information presented in this report represents a great deal of work and time. It is the product of a team effort, in every sense of the phrase.Paul Migliore and many others at the National Renewable Energy Laboratory (NREL) National Wind Technology Center (NWTC) arranged for us to conduct the atmospheric tests. As far as the authors are aware, this investigation was the fi rst where non-NREL personnel conducted their experiments independently using a NWTC turbine. The exercise was valuable, enlightening, and pleasurable. Lee Fingersh and Dave Jager, in particular, provided ...

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Experimental Investigation of Aerodynamic Devices for Wind Turbine Rotational Speed Control: Phase I

Cited by 10 publications

References 1 publication

Fatigue Loads Mitigation on Horizontal Axis Wind Turbines Using Aerodynamic Devices. A Survey

Fatigue Loads Mitigation on Horizontal Axis Wind Turbines Using Aerodynamic Devices. A Survey

Active load control techniques for wind turbines.

Atmospheric tests of trailing-edge aerodynamic devices

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