Power improvement of NREL 5-MW wind turbine using multi-DBD plasma actuators

Ebrahimi, Abbas; Movahhedi, Mohammadreza

doi:10.1016/j.enconman.2017.05.019

Cited by 50 publications

(15 citation statements)

References 46 publications

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“…As can be seen from Figure 8a,c,e, the x-velocity of the induced jet for each case is larger than the z-velocity, indicating that the wall jet is dominated in the wall-parallel direction. This is consistent with a similar numerical study on the wind turbine blade by Ebrahimi et al [26]. According to Figure 8b,d,f, a negative z-velocity exists above every single-SDBD actuator, and a positive z-velocity appears downstream of the jet induced by each actuator.…”

Section: Plasma Actuators In Quiescent Airsupporting

confidence: 92%

Numerical Investigation of Multi-SDBD Plasma Actuators for Controlling Fluctuating Wind Load on Building Roofs

Zhang

Sun

et al. 2019

Applied Sciences

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The present research aims to explore, by large-eddy simulation (LES), the potentiality and mechanism of multiple surface dielectric barrier discharge (multi-SDBD) plasma actuators to manipulate mean and fluctuating wind loads on a low-rise building. Three actuator configurations are located on the roof to induce directional wall jets in different directions. The effects of these configurations on flow structure and wind loads are studied in absence and presence of approaching flow. Results show that all subgrid-scale models can obtain accurate roof pressure, and for the diffusion and convection terms, the bounded central differencing scheme can provide more accurate predictions for the roof pressure. The control impact of active actuators gradually weakens with the increase of the approaching flow velocity. The direction of the wall jet can determine the position of the limited roof region with the reduced mean pressure coefficient. The multi-SDBD actuators continue to absorb the upstream flow and blow this flow downstream, meaning the wall jet exerts strong pressure on the local roof area at the end of the jet, which results in a significant reduction of the mean pressure coefficient. Furthermore, the counter-rotating vortices caused by the wall jet restrain the size and strength of the vortex shedding, thereby achieving the purpose of reducing the fluctuating pressure coefficient. Further analysis of the instantaneous vorticity fields indicates that the intensity and size of streamwise shedding vortices can be restrained by small-scale spanwise vortices induced by the plasma actuators. Under the action of the wall jet blowing from the trailing edge to the leading edge, the fluctuating lift and drag coefficients can be reduced by over 15% and the fluctuating pressure coefficient can be reduced by about 20% from the no actuation situation.

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Section: Plasma Actuators In Quiescent Airsupporting

confidence: 92%

Numerical Investigation of Multi-SDBD Plasma Actuators for Controlling Fluctuating Wind Load on Building Roofs

Zhang

Sun

et al. 2019

Applied Sciences

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“…According to the results, shown in Table 1, for the airfoil cases and the wind turbine location analysed, AEP of the WT with flow control devices is incremented by a 3.85% in comparison with the WT without these devices. This increase is much higher than the one achieved by Ebrahimi et al [11] in the same wind turbine but with plasma actuators, in which the increment for the best case does not exceed the 0.85%.…”

Section: Simulation Of Wind Turbine Energy Productioncontrasting

confidence: 56%

5 MW Wind Turbine Annual Energy Production Improvement by Flow Control Devices

Saenz‐Aguirre

Fernandez-Resines

Aramendia

et al. 2018

The 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment

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Several flow control devices have been studied in recent years. Majority of them were designed firstly for aeronautical purposes. At present many research is aimed to introduce these devices in wind turbines (WTs) in order to optimize their aerodynamic performance. The main goal of the present work is to analyze the influence of passive flow control devices, Vortex Generators and Gurney Flaps, on the Annual Energy Production (AEP) of a large Horizontal Axis Wind Turbine (HAWT). Consequently, BEM based calculations were performed in order to study their effect on the NREL offshore 5 MW Baseline Wind Turbine. Obtained results show an increment in the maximum value of the power coefficient, Cp_max, and a considerable improvement of the AEP.

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“…A field test on a 1.75-MW turbine [235] indicated that actuators can effectively suppress flow separation, resulting in the power augmentation of nearly 5% and expansion of operational wind envelope. For power augmentation underrated wind conditions, such as that for a 5-MW offshore wind turbine [236], a rotor power enhancement of up to 0.85% was achieved, with a recommendation for actuator-placement in the inboard blade-region to maximize the aerodynamic forces, rotor torque, and power. Furthermore, a theoretical modeling of wind turbine regulation in off-rated conditions using plasma actuation can yield up to 25% enhancement [237], the regulating effect of which was validated by experimental investigations performed at NREL (Denver).…”

Section: Plasma Actuatorsmentioning

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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Power improvement of NREL 5-MW wind turbine using multi-DBD plasma actuators

Cited by 50 publications

References 46 publications

Numerical Investigation of Multi-SDBD Plasma Actuators for Controlling Fluctuating Wind Load on Building Roofs

Numerical Investigation of Multi-SDBD Plasma Actuators for Controlling Fluctuating Wind Load on Building Roofs

5 MW Wind Turbine Annual Energy Production Improvement by Flow Control Devices

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

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