Wind tunnel testing of NREL's unsteady aerodynamics experiment

Fingersh, Lee; Simms, D.; Hand, M.; Jäger, D.; Cotrell, Jason; Robinson, M.; Schreck, S.; Larwood, Scott M.

doi:10.2514/6.2001-35

Cited by 20 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…), ambient air characteristics (temperature, heat, humidity, wind velocity, etc. ), and the dielectric surface design [191,[195][196][197]. Plasma actuators are designed with various configurations, some of the primary ones include devices with DC surface corona discharge, AC surface dielectric barrier discharge, sliding discharge, and wall jet [85,191,193,198].…”

Section: Plasma Actuatorsmentioning

confidence: 99%

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

Akhter

Omar

2021

Energies

View full text Add to dashboard Cite

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.

show abstract

Section: Plasma Actuatorsmentioning

confidence: 99%

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

Akhter

Omar

2021

Energies

View full text Add to dashboard Cite

show abstract

“…These reports touch upon the relevant research carried out by the participants in the tasks and they include extensive literature lists. A large part of these lists are added to this article, where the references Shipley, Miller, Robinson, Luttges, and Simms (), Hansen (), van Rooij, Timmer, and Bruining (), Acker and Hand (), Bermudez, Velasquez, and Matesanz (), Bjorck (), Bruining (), Chaviaropoulos et al (), Duque, van Dam, and Hughes (), Feigl (), Graham & Brown, , Leclerc and Masson (), Maeda and Schepers (), Miller et al (), Schepers (), Schepers, Feigl, Van Rooij, and Bruining (), Schepers and van Rooij (), Schreck, Robinson, Hand, and Simms (), Simms, Robinson, Hand, and Fingersh (), Snel (), Strzelczyk (, ), van Rooij (, ), van Rooij, Bruining, and Schepers (), and van Rooij and Schepers () are related to IEA tasks 14/18.…”

Section: Aerodynamic Measurements: Results and Progressmentioning

confidence: 99%

Aerodynamic measurements on wind turbines

Schepers

Schreck

2018

WIREs Energy & Environment

View full text Add to dashboard Cite

This article reviews the aerodynamic measurement programs on wind turbines that have been performed in the last decades. It is largely based on results from four projects carried out under auspices of the International Energy Agency (IEA), which are denoted as IEA Tasks 14, 18, 20, and 29. The aim of these projects was to collect and analyze aerodynamic measurements on five field facilities (IEA Tasks 14 and 18), the National Renewable Energy Laboratory Phase VI turbine placed in the large NASA Ames wind tunnel (IEA Task 20), and the Mexico turbine placed in the Large Low Speed Facility of the German Dutch Wind tunnel DNW (IEA Task 29). Other experimental programs with an important aerodynamic content are touched upon as well. Research areas for which these measurements have led to important progress are identified. The progress is illustrated with analyses on these experiments. It is shown that detailed aerodynamic measurements are an absolute necessity for the validation and improvement of wind turbine design codes, where it is also concluded that the amount of measurement data which has been produced until now is still far too limited. This article is categorized under: Wind Power > Science and Materials

show abstract

“…where is a part of the subgrid scale isotropy,μt denotes the SGS turbulent viscosity force defined as follows: (5) where Cs is the Smagorinsky constant and chosen as 0.032 to reduce the diffusion of subgrid stress.…”

Section: Governing Equationsmentioning

confidence: 99%

“…However, the experimental results show that the anemometer is unable to obtain the global instantaneous flow field information. J. Wha et al used Particle Image Velocimetry (PIV) technology to measure the wake flow of the three-blade wind turbine model in the water tank [5], and compared the results with the data obtained from the real wind turbine. A new method for the study of wind turbine wake was provided, but the experimental data and the actual data were quite different, and the research was mainly focused on the near wake flow field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Wind Turbine Wake Flow and Effects of the Inflow Turbulence

Luo

2018

CEJ

View full text Add to dashboard Cite

Considering the fact that wind turbines operate at the bottom of the atmospheric boundary layer (ABL) where the turbulence is at a high level, and the difficulty of mesh generation in the fully modelled numerical simulation. It is necessary to carry out researches to study the wake flow of wind turbines with consideration of the inflow turbulence. Therefore, a numerical method generating turbulence was proposed and the results show good agreement with those in experiment, based on which the flow fields in the wake of a wind turbine at two tip speed ratios were examined in detail through three actuator methods, namely, ADM, ADM-R and ALM. The performances of these methods were studied and the error sources for each method are clarified. Moreover, the computational efficiency was revealed and the influencing factor for the efficiency is concluded. Besides, the equilibrium relation of the N-S equation in the wake is revealed, which provides a theoretical basis for the optimal arrangement of the wind turbine. It shows that the mean velocity and fluctuating velocity vary greatly near the wind turbine, and become stable gradually away from the wind turbine. The results of ALM method show the best agreement with the experiment. At near wake region, the turbulent stress term, pressure gradient term and convection term mainly contribute to the equation equilibrium, and convection term is in equilibrium with the turbulent stress term at far wake. The results of ALM method are the most accurate and the most time consuming.

show abstract

Wind tunnel testing of NREL's unsteady aerodynamics experiment

Cited by 20 publications

References 2 publications

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

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

Aerodynamic measurements on wind turbines

Numerical Study of the Wind Turbine Wake Flow and Effects of the Inflow Turbulence

Contact Info

Product

Resources

About