Performance Analysis of Different Positions of Leading Edge Tubercles on a Wind Turbine Blade

Abate, Giada; Mavris, Dimitri N.

doi:10.2514/6.2018-1494

Cited by 14 publications

(7 citation statements)

References 11 publications

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“…Experimental study considering spherical TLE is carried out at Reynolds number of 200,000. The experimental results showed that spherical TLE improved performance compared to airfoil without tubercles (Abate and Mavris, 2018;Aftab and Ahmad, 2017). It was noted that tubercles could generate a unique flow control mechanism, offering the humpback exceptional maneuverability.…”

Section: State Of the Art Conceptmentioning

confidence: 98%

Experimental investigations of flow over NACA airfoils 0021 and 4412 of wind turbine blades with and without Tubercles

et al. 2021

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Experimental investigations of wind turbine blades having NACA airfoils 0021 and 4412 with and without tubercles on the leading edge have been performed in a wind tunnel. It was found that the lift coefficient of the airfoil 0021 with tubercles was higher at Re = 1.2×105 and 1.69×105 in post critical region (at higher angle of attach) than airfoils without tubercles but this difference relatively diminished at higher Reynolds numbers and beyond indicating that there is no effect on the lift coefficients of airfoils with tubercles at higher Reynolds numbers whereas drag coefficient remains unchanged. It is noted that at Re = 1.69×105, the lift coefficient of airfoil without tubercles drops from 0.96 to 0.42 as the angle of attack increases from 15° to 20° which is about 56% and the corresponding values of lift coefficient for airfoil with tubercles are 0.86 and 0.7 at respective angles with18% drop.

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Section: State Of the Art Conceptmentioning

confidence: 98%

Experimental investigations of flow over NACA airfoils 0021 and 4412 of wind turbine blades with and without Tubercles

et al. 2021

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“…In contrast, it is easier to realize the passive methods to change the characteristics of the main flow by adding auxiliary components on the external surface and mixing the airflow of the components with the main flow. For example, tip winglets [7][8][9][10], bionic leading edges [11][12][13], Gurney flaps [14][15][16], vortex generators [17][18][19][20][21][22][23][24], and other components have been added to the blades to improve the wind turbine's aerodynamic performance. Nobari et al [7] studied a wind turbine equipped with flat winglets by the finite volume method, and the wind turbine power increased by 16% after optimization.…”

Section: Introductionmentioning

confidence: 99%

“…Khaled [8] and Mourad [10] et al researched the influence of winglet length, tilt angle, and winglet height on the aerodynamic characteristics of horizontal axis wind turbines; they pointed out that winglet configuration and setting position were important factors affecting blade performance. Abate et al [12,13] designed and calculated the flow field characteristics of a uniformly distributed wave front wind turbine blade and found that the best effect could be achieved when the wave front was placed at 95% of the span direction, and the export power of the new configuration was increased by up to 10%. Yang et al [15] tested the impact of changing the height and thickness of Gurney flaps on wind airfoils through wind tunnel experiments; their research showed that the height parameter of the Gurney flaps had the main influence.…”

Section: Introductionmentioning

confidence: 99%

A New Flow Control and Efficiency Enhancement Method for Horizontal Axis Wind Turbines Based on Segmented Prepositive Elliptical Wings

Bai,

Zhan,

2023

Aerospace

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Flow separation occurs when wind turbines operate under large inflow conditions, which seriously affects the utilization of wind energy and reduces the output power of the blade. Therefore, a composite flow control configuration for horizontal axis wind turbines, founded on segmented prepositive elliptical wings, is proposed for efficiency enhancement. Taking a typical NREL Phase VI wind turbine as the prototype, its separation effect is evaluated by the CFD method. Then, starting from the improvement of the two-dimensional airfoil flow, the prepositive elliptic wing is designed according to the airfoil flow, and the optimal two-dimensional flow control configuration of the blade airfoil is obtained by simulation analysis. Finally, the two-dimensional configuration is extended to three-dimensional, and the aerodynamic characteristics of the blade before and after flow control are simulated and compared. The results show that, at wind speeds of 10~20 m/s, flow separation on the blade is effectively inhibited; meanwhile, the pressure difference between the pressure surface and the suction surface increases. These characteristics greatly improve the performance of wind turbine and increase its torque by more than 30%. Moreover, when the flow control effect cannot be reached, the blade torque is only reduced by approximately 2%.

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“…Nevertheless, the VAWT is the most practical turbine to be used in this educational kit because it can operate in any direction of incoming wind flow, has a simple design and low manufacturing cost [12][13][14][15][16]. Furthermore, extensive research from previous studies expanded the potential of this turbine with a vast modification to the VAWT to overcome the shortcoming in its efficiency in power performance [17][18][19][20][21]. The VAWT includes the Darrieus turbine and Savonius turbine, which are lift-driven and drag-driven turbines based on the force that drives them to rotate.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Savonius Turbine for STEM Education

Bakar

Mu’in

Kamaruddin

2022

ARASET

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There are very few initiatives to engage students in learning about the sustainability of wind energy through Science, Technology, Engineering, and Mathematics education, also known as STEM. This awareness is essential for future generations to instill interest and understanding in the significance of sustainable energy. Therefore, a practical, hands-on Savonius turbine demonstration kit has been designed for Science, Technology, Engineering, and Mathematics (STEM) education. Two models of drag-driven vertical axis 2-bladed and 3-bladed Savonius turbines were built to generate electricity and integrated with a model house as part of the STEM turbine kit. It was fabricated in-house and could display power using LED lights and actuating a few mechanical devices. The experimental study in this project aims to investigate and analyze the influence of the number of blades on turbine power performance in terms of power coefficient and torque coefficient with respect to tip speed ratio. The results revealed that the 3-bladed Savonius turbine has a higher power coefficient than the 2-bladed at a tip speed ratio of 0.109. However, the torque coefficient decreased as the tip speed ratio increased due to an increase in the number of blades that eventually created a reverse torque. It is also observed that the 3-bladed turbine generated the highest power output of 1.28 Watt at a speed of 38.8 m/s. The results also discovered that all the components could run more efficiently using the 3-bladed Savonius turbine. This kit demonstrates the ability to contribute to the education system in developing countries, such as Malaysia by supporting the construction of an engaging educational process with practical integration and low production costs.

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Performance Analysis of Different Positions of Leading Edge Tubercles on a Wind Turbine Blade

Cited by 14 publications

References 11 publications

Experimental investigations of flow over NACA airfoils 0021 and 4412 of wind turbine blades with and without Tubercles

Experimental investigations of flow over NACA airfoils 0021 and 4412 of wind turbine blades with and without Tubercles

A New Flow Control and Efficiency Enhancement Method for Horizontal Axis Wind Turbines Based on Segmented Prepositive Elliptical Wings

Design and Development of Savonius Turbine for STEM Education

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