NREL VI rotor blade: numerical investigation and winglet design and optimization using CFD

Elfarra, Monier A.; Sezer-Uzol, Nilay; Akmandor, I. Sinan

doi:10.1002/we.1593

Cited by 80 publications

(54 citation statements)

References 19 publications

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“…Multi‐grid method , local time‐stepping and implicit residual smoothing are used in order to speed‐up the convergence for steady computations. FINE/Turbo has been previously validated in the framework of NREL Phase VI rotor‐only simulations by other authors . A complete study of the DTU 10MW RWT wind turbine static aeroelasticity in a rotor‐only context was already presented by Horcas et al .…”

Section: Methodsmentioning

confidence: 99%

Rotor‐tower interactions of DTU 10MW reference wind turbine with a non‐linear harmonic method

et al. 2016

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In this paper, a computational study of the DTU 10MW reference wind turbine unsteady aerodynamics is presented. The whole wind turbine assembly was considered, including the complete rotor and the tower. The FINE/Turbo flow solver developed by NUMECA International was employed for the simulations. In particular, the Non‐Linear Harmonic (NLH) method was applied in order to accurately model flow unsteadiness at reduced computational cost. Important vortex shedding structures were identified at low blade span range and all along the tower height. A strong interaction between rotor and tower flows was also observed. Lastly, the performance of the NLH approach was compared against a standard Unsteady Reynolds‐Averaged Navier Stokes simulation. The same complex unsteady flow phenomena were captured by both technologies. Nevertheless, the NLH approach was found to be 10 times faster than the Unsteady Reynolds‐Averaged Navier Stokes method for this particular application. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Rotor‐tower interactions of DTU 10MW reference wind turbine with a non‐linear harmonic method

et al. 2016

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“…Winglets (shown in Figure 11) are vertical projections on an airfoil blade which help reduce the drag and increase L/D ratio. Elfarra et al [116] designed a winglet on National Renewable Energy Laboratory (NREL) rotor blade and optimized for the computational cost using the artificial neural network at different wind speeds. The study reported around 9% increase in the power for the horizontal axis wind turbine.…”

Section: Numerical Investigations For Wind Turbine Performance Analysismentioning

confidence: 99%

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

et al. 2018

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Among renewable sources of energy, wind is the most widely used resource due to its commercial acceptance, low cost and ease of operation and maintenance, relatively much less time for its realization from concept till operation, creation of new jobs, and least adverse effect on the environment. The fast technological development in the wind industry and availability of multi megawatt sized horizontal axis wind turbines has further led the promotion of wind power utilization globally. It is a well-known fact that the wind speed increases with height and hence the energy output. However, one cannot go above a certain height due to structural and other issues. Hence other attempts need to be made to increase the efficiency of the wind turbines, maintaining the hub heights to acceptable and controllable limits. The efficiency of the wind turbines or the energy output can be increased by reducing the cut-in-speed and/or the rated-speed by modifying and redesigning the blades. The problem is tackled by identifying the optimization parameters such as annual energy yield, power coefficient, energy cost, blade mass, and blade design constraints such as physical, geometric, and aerodynamic. The present paper provides an overview of the commonly used models, techniques, tools and experimental approaches applied to increase the efficiency of the wind turbines. In the present review work, particular emphasis is made on approaches used to design wind turbine blades both experimental and numerical, methodologies used to study the performance of wind turbines both experimentally and analytically, active and passive techniques used to enhance the power output from wind turbines, reduction in cut-in-speed for improved wind turbine performance, and lastly the research and development work related to new and efficient materials for the wind turbines.

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“…Inclusion of sweep and cant angles parameters was suggested to improve performance of winglet. Elfarra et al [74] varied can't and twist angle of winglets in determination of maximum torque for maximum power generation. NREL VI wind turbine could increase annual power production by around 9% when optimized tilted tips of 1.5%R height are considered.…”

Section: Wingletsmentioning

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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NREL VI rotor blade: numerical investigation and winglet design and optimization using CFD

Cited by 80 publications

References 19 publications

Rotor‐tower interactions of DTU 10MW reference wind turbine with a non‐linear harmonic method

Rotor‐tower interactions of DTU 10MW reference wind turbine with a non‐linear harmonic method

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

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

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