Performance improvement of Darrieus wind turbine using different cavity layouts

Roshan, Milad Yousefi; Khaleghinia, Jahanfar; Nimvari, Majid Eshagh; Salarian, Hesamoddin

doi:10.1016/j.enconman.2021.114693

Cited by 23 publications

(8 citation statements)

References 39 publications

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“…But these installations have a disadvantage in the form of low efficiency, and the negative torque generated on the return blade limits its use in a large mastshab. Another representative is the Darrieus rotor [16,17], the disadvantage of which is also the low starting torque. In this regard, the authors have created a mathematical model of a wind turbine with a vertical axis of rotation, with combined blades (cylindrical and fixed blades) (Fig.…”

Section: Discussion Of the Results Of The Study Of The Aerodynamic Ch...mentioning

confidence: 99%

“…The authors of the work [17] by changing the blade profile (shape, number, size and location of the blades) of the Darye wind turbine improved the power factor by 18 %. Numerical simulation is performed using nonstationary Navier-Stokes equations with Reynolds averaging (URANS), which were solved numerically in combination with the SST k-ω turbulence model.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Identifying some regularities of the aerodynamics around wind turbines with a vertical axis of rotation

Tanasheva,

Ranova,

Satybaldin

et al. 2024

EEJET

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The design of wind turbines with a vertical axis of rotation is quite simple, which successfully increases the level of efficiency. Existing vane wind turbines have a shortage of currents in the form of negative torque, and installations operating on the Magnus effect have a low lifting force. In this regard, the development and research of installations operating at speeds from 3 m/s, with combined blades with increased work efficiency is an urgent topic. The object of the study is a wind turbine consisting of a system of rotating cylinders and fixed blades operating at low air flow speeds starting from 3 m/s. Numerical studies were carried out using the Ansys Fluent program and the implemented k-ε turbulence model. A special feature of the work is the combined use of two lifting forces: a cylinder and fixed blades, which made it possible to increase the output aerodynamic parameters. Calculations were performed for incoming flow rates of 3 m/s, 9 m/s, 15 m/s and cylinder rotation speeds of 315 rpm, 550 rpm, 720 rpm. It is determined that the period of change of the moment of forces T is 0.5 m/s, which corresponds to 2 revolutions of the wind wheel per minute. It was found that the cylinder rotation frequency in the range from 315 rpm to 720 rpm does not affect the period of change in the moment of forces, but the amplitude of the moment of forces increases with decreasing rotation frequency. The dependences of the rotation speed of the wind wheel on the velocity of the incoming flow, found by the method of sliding grids and 6DOF, are also obtained. It is determined that the installation begins to make revolutions from 3 m/s, with a positive torque of forces. The field of practical application of the numerical results will be useful for further research of wind turbines with combined blades

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Section: Discussion Of the Results Of The Study Of The Aerodynamic Ch...mentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Identifying some regularities of the aerodynamics around wind turbines with a vertical axis of rotation

Tanasheva,

Ranova,

Satybaldin

et al. 2024

EEJET

View full text Add to dashboard Cite

show abstract

“…Yousefi et al. 114 analyzed dimple layout’s effect on rotor performance, concluding that a single dimple airfoil surpassed double dimple alternatives. Finally, Ibrahim et al.…”

Section: Wind Energy Rectifiersmentioning

confidence: 99%

Small wind turbines and their potential for internet of things applications

Wang,

Xiong,

Zhang

et al. 2023

iScience

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“…They concluded that the use of a slat could increase the lift coefficient up to 24.89% at AOA=19.2°. Roshan et al 16 numerically studied the effects of cavity shape, number, sizes, and positions on the performance of a vertical axis wind turbine (VAWT). According to their results, a single cavity leads to more power increase than a dual one, improving the power coefficient up to 18%.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of horizontal axis wind turbines using curved gurney flap: 3D numerical investigation

Sedighi,

Akbarzadeh,

Salavatipour

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The impact of curved Gurney flaps on the performance of a 660 kW V47 horizontal axis wind turbine (HAWT) is analyzed in this study. The trailing edge of the turbine blades is passively modified by curved flaps. The continuity and momentum equations are solved using a Reynolds-averaged Navier-Stokes solver and Shear-Stress-Transport turbulent model. The effect of the direction and radius of curved flaps on the aerodynamic performance of the wind turbine (torque and power generation, flow separation, and thrust loads) is examined. The study examines how the curved flap’s performance on HAWT is affected by the blade pitch angle ([Formula: see text]) and wind speed ([Formula: see text]). According to the results, curve flaps have a positive impact on the output torque at lower pitch angles ([Formula: see text]). The average torque increase for [Formula: see text] and [Formula: see text] is 3.7% for curve flaps, while it is only 2.9% for flat flaps. This conclusion is not valid for higher pitch angles ([Formula: see text]) where the flap disrupts the aerodynamic performance. Further, the use of curve flaps with the radius of [Formula: see text] (inward-type) can improve the torque produced (up to [Formula: see text]) compared to other curved flaps and even flat flaps, especially around the nominal operating point. This conclusion is valid for [Formula: see text], while for higher pitch angles, the flat Gurney flap has better performance generally.

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Performance improvement of Darrieus wind turbine using different cavity layouts

Cited by 23 publications

References 39 publications

Identifying some regularities of the aerodynamics around wind turbines with a vertical axis of rotation

Identifying some regularities of the aerodynamics around wind turbines with a vertical axis of rotation

Small wind turbines and their potential for internet of things applications

Performance improvement of horizontal axis wind turbines using curved gurney flap: 3D numerical investigation

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