Numerical investigation of optimal yaw misalignment and collective pitch angle for load imbalance reduction of rigid and flexible HAWT blades under sheared inflow

Jeong, Mok-Kun; Cha, Myung-Chan; Kim, Sang-Woo; Lee, In

doi:10.1016/j.energy.2015.03.016

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…The coupled way is done by exchanging the information between the fluid and structure solver in explicit form. The results of Case 5 are given by Jeong et al [30] with BEM. In their research, the FSI (Fluid-Structure interaction) applies a strong coupling method which is using a first order implicit-explicit coupling scheme.…”

Section: Comparison Of the Power And The Thrustmentioning

confidence: 99%

“…Comparison of different cases results in 8 m/s: (a) power; and (b) thrust Case 1: Elastic Actuator Line Model (present study); Case 2: NREL's FAST code; Case 3: Horizontal Axis Wind turbine simulation Code 2nd generation results; Case 4: research by Li et al [17]; Case 5: research by Jeong et al [30]; Case 6: research by Ponta et al [31]; Case 7: research by Yu et al [32,33]; Case 8: research by Ma et al [13]. Comparison of different cases results in 11.4 m/s: (a) power; and (b) thrust Case 1: Elastic Actuator Line Model (present study); Case 2: NREL's FAST code; Case 3: Horizontal Axis Wind turbine simulation Code 2nd generation results; Case4: research by Li et al[17]; Case 5: research by Jeong et al[30]; Case 6: research by Ponta et al[31]; Case 7: research by Yu et al[32,33]; Case 8: research by Ma et al[13].…”

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confidence: 94%

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Aeroelastic Performance Analysis of Wind Turbine in the Wake with a New Elastic Actuator Line Model

Zheng

et al. 2020

Water

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The scale of a wind turbine is getting larger with the development of wind energy recently. Therefore, the effect of the wind turbine blades deformation on its performances and lifespan has become obvious. In order to solve this research rapidly, a new elastic actuator line model (EALM) is proposed in this study, which is based on turbinesFoam in OpenFOAM (Open Source Field Operation and Manipulation, a free, open source computational fluid dynamics (CFD) software package released by the OpenFOAM Foundation, which was incorporated as a company limited by guarantee in England and Wales). The model combines the actuator line model (ALM) and a beam solver, which is used in the wind turbine blade design. The aeroelastic performances of the NREL (National Renewable Energy Laboratory) 5 MW wind turbine like power, thrust, and blade tip displacement are investigated. These results are compared with some research to prove the new model. Additionally, the influence caused by blade deflections on the aerodynamic performance is discussed. It is demonstrated that the tower shadow effect becomes more obvious and causes the power and thrust to get a bit lower and unsteady. Finally, this variety is analyzed in the wake of upstream wind turbine and it is found that the influence on the performance and wake flow field of downstream wind turbine becomes more serious.

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Section: Comparison Of the Power And The Thrustmentioning

confidence: 99%

mentioning

confidence: 94%

Aeroelastic Performance Analysis of Wind Turbine in the Wake with a New Elastic Actuator Line Model

Zheng

et al. 2020

Water

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“…It was found that in deterministic inflow the blade load variations (steady-state) could be reduced by 70% [23]. In addition, it was found that the fluctuation of the root flapwise bending moment of rigid blades can be reduced by 84.5% through optimizing the yaw and pitch angles [24].…”

Section: Introductionmentioning

confidence: 99%

Further Study on the Effects of Wind Turbine Yaw Operation for Aiding Active Wake Management

Dai

Yang

et al. 2020

Applied Sciences

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Active wake management (AWM) via yaw control has been discussed in recent years as a potential way to improve the power production of a wind farm. In such a technique, the wind turbines will be required to work frequently at misaligned yaw angles in order to reduce the vortices in the wake area behind the turbines. However, today, it is still not very clear about how yaw operation affects the dynamics and power generation performance of the wind turbines. To further understand the effects of yaw operation, numerical research is conducted in this paper. In the study, the optimal size of the flow field used in the computational fluid dynamics (CFD) calculation was specifically discussed in order to obtain an efficient numerical model to quickly and accurately predict the dynamics and the performance of the turbines. Through this research, the correlation between the blade loads during yaw and non-yaw operations is established for aiding yaw control, and the blade loads and power generation performances of the wind turbine during yaw operation under different wind shear and blade deflection conditions are analyzed for understanding the effects of yaw operation. It is found that the optimal size of the flow field for performing efficient and accurate CFD calculations does exist. The misaligned yaw operation generally tends to decrease the loads acting on the blade. However, the aerodynamic energy captured by the turbine rotor and blade loads during yaw operation is not only dependent on the yaw angle of the rotor but is also affected by wind speed, rotor speed, the pitch angle of the blades, blade deflection, and wind shear. Particularly, it is interestingly found that wind shear can cause undesirable fluctuation of the power, which will challenge the power quality of the wind farm if no measures are taken.

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“…In the vertical axis wind turbine, the rotating axis of the wind turbine stands vertical or perpendicular to the ground. HAWTs are the most popular configuration because they have higher efficiency [5]. In a HAWT the generator converts directly the wind which is extracted from the rotor.…”

Section: Introductionmentioning

confidence: 99%

“…In a HAWT the generator converts directly the wind which is extracted from the rotor. HAWT are conventional wind turbines and unlikely the VAWT are not omnidirectional [5]. They must have some means for orienting the rotor with respect to the wind.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Performance and Vibration Analyses of Small Scale Horizontal Axis Wind Turbine with Various Number of Blades

Rahman¹,

Maroha²,

Shahat³

et al. 2018

JPEE

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The need to generate power from renewable sources to reduce demand for fossil fuels and the damage of their resulting carbon dioxide emissions is now well understood. Wind is among the most popular and fastest growing sources of alternative energy in the world. It is an inexhaustible, indigenous resource, pollution-free, and available almost any time of the day, especially in coastal regions. As a sustainable energy resource, electrical power generation from the wind is increasingly important in national and international energy policy in response to climate change. Experts predict that, with proper development, wind energy can meet up to 20% of US needs. Horizontal Axis Wind Turbines (HAWTs) are the most popular because of their higher efficiency. The aerodynamic characteristics and vibration of small scale HAWT with various numbers of blade designs have been investigated in this numerical study in order to improve its performance. SolidWorks was used for designing Computer Aided Design (CAD) models, and ANSYS software was used to study the dynamic flow around the turbine. Two, three, and five bladed HAWTs of 87 cm rotor diameter were designed. A HAWT tower of 100 cm long and 6 cm diameter was considered during this study while a shaft of 10.02 cm diameter was chosen. A good choice of airfoils and angle of attack is a key in the designing of a blade of rough surface and maintaining the maximum lift to drag ratio. The S818, S825 and S826 airfoils were used from the root to the tip and 4˚ critical angle of attack was considered. In this paper, a more appropriate numerical models and an improved method have been adopted in comparable with other models and methods in the literature. The wind flow around the whole wind turbine and static behavior of the HAWT rotor was solved using Moving Reference Frame (MRF) solver. The HAWT How to cite this paper: Rahman76 Journal of Power and Energy Engineering M. Rahman et al.rotor results were used to initialize the Sliding Mesh Models (SMM) solver and study the dynamic behavior of HAWT rotor. The pressure and velocity contours on different blades surfaces were analyzed and presented in this work. The pressure and velocity contours around the entire turbine models were also analyzed. The power coefficient was calculated using the Tip Speed Ratio (TSR) and the moment coefficient and the results were compared to the theoretical and other research. The results show that the increase of number of blades from two to three increases the efficiency; however, the power coefficient remains relatively the same or sometimes decreases for five bladed turbine models. HAWT rotors and shaft vibrations were analyzed for two different materials using an applied pressure load imported from ANSYS fluent environment. It has proven that a good choice of material is crucial during the design process.

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Numerical investigation of optimal yaw misalignment and collective pitch angle for load imbalance reduction of rigid and flexible HAWT blades under sheared inflow

Cited by 13 publications

References 32 publications

Aeroelastic Performance Analysis of Wind Turbine in the Wake with a New Elastic Actuator Line Model

Aeroelastic Performance Analysis of Wind Turbine in the Wake with a New Elastic Actuator Line Model

Further Study on the Effects of Wind Turbine Yaw Operation for Aiding Active Wake Management

Aerodynamic Performance and Vibration Analyses of Small Scale Horizontal Axis Wind Turbine with Various Number of Blades

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