Improving the efficiency of Darrieus turbines through a gear-like turbine layout

Tian, Wenlong; Ni, Xiwen; Li, Bo; Yang, Guangyong; Mao, Zhaoyong

doi:10.1016/j.energy.2022.126580

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…The second-order upwind scheme for momentum, turbulent kinetic energy and specific dissipation while second-order implicit for transient formulation were applied. The fluid properties of air were kept as default, with a density of 1.225 kg/m 3 and a viscosity of 1.7894x10 5 . The widely adopted shear stress transport (SST) 𝑘−ω turbulence model was selected [5,7,8,10,11].…”

Section: Numerical Settingsmentioning

confidence: 99%

“…The fluid properties of air were kept as default, with a density of 1.225 kg/m 3 and a viscosity of 1.7894x10 5 . The widely adopted shear stress transport (SST) 𝑘−ω turbulence model was selected [5,7,8,10,11]. The absolute convergence criteria for all residuals were set to 1E-5 following the numerical study performed by Castelli et al [13].…”

Section: Numerical Settingsmentioning

confidence: 99%

“…Several other studies have introduced modifications intending to increase the turbine's efficiency. This includes enhancing turbine configurations such as using multi-turbine layouts [5] or incorporating turbines around buildings [6], as well as altering the geometry of the blades [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of the effects of increased and mixed chord lengths for a 4-bladed darrieus vertical axis wind turbine

Wong,

Lim,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Increasing amounts of study and research on vertical axis wind turbines (VAWTs) have shown that they are a competitive option in wind energy power generation. However, the VAWT’s primary drawback is low power efficiencies. Although there are several studies on the effects of solidity on Darrieus VAWT performances, few focus on the effect of the aerofoil chord length. Hence, in the present study, 2D numerical simulations are performed to explore the effects of different aerofoil chord lengths on the performance of a Darrieus VAWT. The simulation was first validated with the experimental data from the literature. The studied turbine is a 4-bladed VAWT fitted with NACA0021 blades with an original chord length, c of 85.8 mm and another with an increased chord length of 1.2 c (102.96 mm). Additionally, a modified rotor geometry with mixed chord lengths of c and 1.2 c to improve turbine performance is proposed and investigated. The coefficients of power (C P) and torque (C T) for tip speed ratios (TSRs) between 1.4 and 3.3 for each of the turbines are evaluated and comparatively analysed. All the data was obtained using the computational fluid dynamics (CFD) software ANSYS Fluent in conjunction with the shear stress transport (SST) k−ω turbulence model. The findings show that the turbine with 1.2 c chord length and hence larger solidity outperforms those with smaller chord lengths at low TSRs. However, their performances decrease significantly at TSRs above 2.5, resulting in up to 86.1% lower C P values. The mixed chord lengths case was successful at achieving significantly higher C P values at both TSR ranges with only a decrease of 3.03% in maximum C P at its optimum TSR.

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Section: Numerical Settingsmentioning

confidence: 99%

Section: Numerical Settingsmentioning

confidence: 99%

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Numerical investigation of the effects of increased and mixed chord lengths for a 4-bladed darrieus vertical axis wind turbine

Wong,

Lim,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The authors of Ref. [14] proposed a Darrieus multi-turbine system in which the coupled rotors meshed with each other. The authors found that such an arrangement improved the efficiency of a single rotor.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Single and Dual Coherent Blades for a Vertical Axis Carousel Wind Rotor Using CFD and Wind Tunnel Testing

Augustyn,

Lisowski

2023

Applied Sciences

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This paper focused on the investigation of the blades for a carousel rotor of a wind turbine with a vertical axis. Cross sections of the single coherent (SC) and the dual coherent (DC) blades were compared in terms of the aerodynamic forces and aerodynamic torque generated during rotor operation for various wind attack angles. The design of the DC blade is novelty proposed by the authors. The main objective of the study was to determine the influence of the blade cross-section on the propelling torque of a wind turbine with three blades, which is an important parameter for rotor starting. First, experimental studies were carried out in a wind tunnel for real-size blade models. A CFD analysis of the airflow around the blades was then conducted. The obtained results were used to evaluate the suitability of applying the studied blade types in the design of the carousel wind rotor. The assessment compared the drag force and the lift force as well as aerodynamic torque as a function of a wind attack angle. It was concluded that the rotor with three DC blades involved mainly the drag force in contrast to the rotor with three SC blades that also involved the lift force to a greater extent. Despite the rotor with DC blades obtained greater values of the drag forces on the blades, the rotor with SC blades obtained a greater starting torque.

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Assessment of fairing geometry effects on H-Darrieus hydro turbine performance using 2D URANS CFD simulations

Fertahi,

Belhadad,

Kanna

et al. 2023

Energy Conversion and Management

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Improving the efficiency of Darrieus turbines through a gear-like turbine layout

Cited by 6 publications

References 24 publications

Numerical investigation of the effects of increased and mixed chord lengths for a 4-bladed darrieus vertical axis wind turbine

Numerical investigation of the effects of increased and mixed chord lengths for a 4-bladed darrieus vertical axis wind turbine

Comparison of Single and Dual Coherent Blades for a Vertical Axis Carousel Wind Rotor Using CFD and Wind Tunnel Testing

Assessment of fairing geometry effects on H-Darrieus hydro turbine performance using 2D URANS CFD simulations

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