An Evaluation of Several Wind Turbine Trailing-Edge Aerodynamic Brakes

Miller, S.; Migliore, P. G.; Quandt, G.

doi:10.1115/1.2871776

Cited by 9 publications

(3 citation statements)

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“…As early as the 1990s, research on flap-based control systems for wind turbines aimed at achieving performance enhancement was initiated by the National Renewable Energy Laboratory (NREL). The studies centered around flap-assisted power regulation and aerodynamic braking [9][10][11] and delaying flow transition [12,13].…”

Section: Performance Enhancement Devices 21 Flapsmentioning

confidence: 99%

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Akhter

Omar

2021

Energies

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It is projected that, in the following years, the wind‐energy industry will maintain its rapid growth over the last few decades. Such growth in the industry has been accompanied by the desirability and demand for larger wind turbines aimed at harnessing more power. However, the fact that massive turbine blades inherently experience increased fatigue and ultimate loads is no secret, which compromise their structural lifecycle. Accordingly, this demands higher overhaul‐and‐maintenance (O&M) costs, leading to higher cost of energy (COE). Introduction of flow‐control devices on the wind turbine is a plausible solution to this issue. Flow‐control mechanisms feature the ability to effectively enhance/suppress turbulence, advance/delay flow transition, and prevent/promote separation, leading to enhancement in aerodynamic and aeroacoustics performance, load alleviation and fluctuation suppression, and eventually wind turbine power augmentation. These flow‐control devices are operated primarily under two schemes: passive and active control. Development and optimization of flow‐control devices present the potential for reduction in the COE, which is a major challenge against traditional power sources. This review performs a comprehensive and up‐to‐date literature survey of selected flow‐control devices, from their time of development up to the present. It contains a discussion on the current prospects and challenges faced by these devices, along with a comparative analysis centered on their aerodynamic controllability. General considerations and conclusive remarks are presented after the discussion.

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Section: Performance Enhancement Devices 21 Flapsmentioning

confidence: 99%

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Akhter

Omar

2021

Energies

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“…The first investigations in this realm have been performed by the National Renewable Energy Laboratory (NREL) in the USA, where trailing edge devices have been investigated for different applications, such as aerodynamic brakes (Migliore et al, 1995), speed control devices (Miller, 1995) or as a means of power regulation and load mitigation (Stuart et al, 1996). There the potential for influencing drag and lift with a trailing edge device as well as the possibility to use this influence to control power and gust loads could be shown.…”

Section: Trailing Edge Flaps For Wind Rotor Bladesmentioning

confidence: 99%

Design and laboratory tests of flexible trailing edge demonstrators for wind turbine blades

Pohl

Riemenschneider

2022

Wind Engineering

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To increase the power yield, wind turbines have significantly grown in the last decades. Today, this growth is more and more limited by the weight of the structures and fatigue loads. To compensate these loads, especially flapwise root bending moments, trailing edge flaps can be used. They can change the lift of the blade with little delay to equalize the aerodynamic lift and by this reduce the fatigue amplitude. Such a trailing edge flap has been designed, developed, built and experimentally tested. It uses a flexible, morphing design to seal the entire mechanics against environmental influences, such as rain, dust, or insects. Therefore a design made from glass fiber reinforced plastics in combination with elastomer materials is used. In this paper the design process from the concept to two consecutive demonstrators is presented. Both are tested in the laboratory for their morphing characteristics.

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“…It originally was used for aerodynamic breaking of wind turbines. Results of research on ailerons via simulating the behaviour of a wind turbine in turbulent wind indicates that aileron load control can assist in power regulation and reduce root flap bending moments during a step-gust and turbulent wind situation (Migliore 1995, Stuart 1996, Enenkl 2002.…”

Section: Figure 1-different Control Systems Affecting Blade Performancementioning

confidence: 99%

Simulation of Wind Turbines Utilising Smart Blades

Maheri¹

2014

Journal of Thermal Engineering

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Wind turbine smart blades change their aerodynamic characteristics in response to changes in operating condition, aiming at enhancing the power capture capability or controlling the power and aerodynamic load. Smart blades span a wide range of technologies. Some of these technologies have been proposed and developed specially for wind turbines, while some others have been borrowed from aircraft applications. Adaptive blades, telescopic blades, morphing blades, blades equipped with active control surfaces are some examples of smart blades. This paper presents a summary of wind turbine smart blades and advances in simulation and design of these blades.

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An Evaluation of Several Wind Turbine Trailing-Edge Aerodynamic Brakes

Cited by 9 publications

References 0 publications

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Design and laboratory tests of flexible trailing edge demonstrators for wind turbine blades

Simulation of Wind Turbines Utilising Smart Blades

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