Numerical study on aerodynamic performance and noise of wind turbine airfoils with serrated gurney flap

Ye, Xuemin; Hu, Jiami; Zheng, Nan; Li, Chunxi

doi:10.1016/j.energy.2022.125574

Cited by 20 publications

(10 citation statements)

References 37 publications

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“…In Zone 2 (Z2), unstructured polyhedral meshes are used with a mesh growth rate of 1.30 from the border of Z1 to the border of the domain. Such a mesh configuration was found to have strong adaptability and high computational efficiency by previous researchers (Ye et al, 2023). Additional zoomed views of the mesh around the airfoil leading edge and the SGF are also shown in Figure 2B.…”

Section: Domain and Mesh Configurationsmentioning

confidence: 56%

Aerodynamic performance and wake development of NACA 0018 airfoil with serrated gurney flaps

Zheng,

Chen

2024

Front. Energy Res.

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Improving the aerodynamic performance of the airfoil is important for optimising the rotor efficiency of the vertical axis wind turbines. As a simple passive control method, the Gurney flap is widely used to improve the aerodynamic performance of airfoils. In this paper, we study the impact of applying a novel serrated gurney flap with different heights on the NACA 0018 airfoil. An improved delayed detached eddy simulation method is adopted to investigate the lift-enhancing mechanism of the serrated gurney flap and the evolution of the downstream vortex system. The results show that the serrated gurney flap can effectively increase the airfoil lift coefficient and the lift-to-drag ratio. The improvement of the serrated gurney flap on the aerodynamic performance of the airfoil is more pronounced at moderate angles of attack. Further analysis of the downstream wake shows that a pair of vortices wraps over both sides of the airfoil and rotates perpendicular to the wake flow, which is produced by the columnar vortex upstream of the flap. These vortices mixed with the wake and accelerated the dissipation of the separated vortex on the suction surface of the airfoil.

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Section: Domain and Mesh Configurationsmentioning

confidence: 56%

Aerodynamic performance and wake development of NACA 0018 airfoil with serrated gurney flaps

Zheng,

Chen

2024

Front. Energy Res.

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“…The mesh size in the immediate vicinity of the airfoil surface is 7 × 10 -6 m for the first layer, accompanied by a mesh growth rate of 1.1, yielding 33 boundary layers to ensure the requirement of y+ ≤ 1 in the boundary layer. The computational domain integrates a prismatic boundary layer grid oriented perpendicularly to the airfoil surface, while other areas employ unstructured polyhedron grids to ensure adaptability and efficacious solutions [17].…”

Section: Simulation Setupmentioning

confidence: 99%

Performance improvements of vertical axis wind turbines with modified gurney flaps

Yang,

Chen,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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Plain Gurney flap (PGF), as a passive flow control method, is widely used to improve the aerodynamic performance. Due to the drag penalty, a novel serrated Gurney flap (SGF) is proposed. The numerical simulation is carried out to investigate the effects of GFs on the aerodynamic performance of the NACA0018 airfoil and an associated two-blade rotor of a H-type Vertical Axis Wind Turbine (VAWT). The height of GF ranges from 1.5% to 6% of the airfoil chord length. The results show that the SGF doesn’t exhibit the same lift enhancement as PGF, but lower drag. When the flap height reaches 6% c, the SGF airfoil has the higher lift-to-drag ratio. The 3%-chord-length height of GFs is employed on the rotor and it implies that both PGF and SGF can enhance the output power of VAWT. SGF has superior performance than GF, especially at the TSR>2.5 conditions. At the optimal TSR=3.0, the output power of SGF turbine is 2.7% higher than that of PGF one. The highest improvement of power can reach 13.3% at TSR=4.0.

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“…The second part is a C-type region outside the circular zone and connects with the third part of a rectangular region. Outside the boundary layer, unstructured polyhedron grids are adopted to provide adaptability and efficient solutions [20]. The mesh topology is shown in Figure 3 with enlarged views of the leading and trailing edges.…”

Section: Mesh Topologymentioning

confidence: 99%

“…The increased drag is unavoidable when the lift is increased by a PGF. A critical issue is to reduce the drag when designing turbine configurations [20]. Owing to the drag penalty, various efforts have been made to reduce the flap's negative influences.…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic Enhancement of Vertical-Axis Wind Turbines Using Plain and Serrated Gurney Flaps

Chen,

Yang,

Zhang

et al. 2023

Applied Sciences

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In light of the escalating demand for renewable energy sources, vertical-axis wind turbines have emerged as a pivotal technical solution for addressing the challenge of clean energy supply in residential and urban areas. As a simple and feasible passive control method, the plain Gurney flap (PGF) is widely applied to improve turbine aerodynamic performance. In this paper, the influence of a novel serrated gurney flap (SGF) with different flap heights is studied on the NACA0021 airfoil by numerical simulations. The findings demonstrate that, compared with the PGF, the SGF reduces the trailing edge reverse vortices from a pair to a single vortex and possesses lower drag. When the flap height reaches 6% of the chord (6%c), the lift-to-drag ratio of SGF surpasses that of PGF. A turbine rotor is equipped with an SGF and a PGF to compare their performances. The result confirms the flap effect depending on the rotor’s tip speed. At a low tip speed ratio (TSR), the PGF works better than the SGF. The SGF is preferred over the PGF for a higher tip speed ratio (TSR > 2.5). With the 6%c flap height, the performance of the SGF rotor surpasses the PGF by 13.9% at TSR = 2.62.

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Numerical study on aerodynamic performance and noise of wind turbine airfoils with serrated gurney flap

Cited by 20 publications

References 37 publications

Aerodynamic performance and wake development of NACA 0018 airfoil with serrated gurney flaps

Aerodynamic performance and wake development of NACA 0018 airfoil with serrated gurney flaps

Performance improvements of vertical axis wind turbines with modified gurney flaps

Aerodynamic Enhancement of Vertical-Axis Wind Turbines Using Plain and Serrated Gurney Flaps

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