Effects of leading edge slat on the aerodynamic performance of low Reynolds number horizontal axis wind turbine

Zaki, Abanoub; Abdelrahman, M.A.; Ayad, Samir S.; Abdellatif, Osama E.

doi:10.1016/j.energy.2021.122338

Cited by 25 publications

(8 citation statements)

References 21 publications

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“…All the components including the blades, shaft, and generator are mounted on the upper part of a tower as demonstrated in Figure 6, and the blades face the wind. In the study by Zaki et al, 25 a horizontal axis wind turbine is utilized to present the study considering the shape of small wind turbines.…”

Section: Different Wind Power Generationmentioning

confidence: 99%

Review of FACTS technologies and applications for accelerating penetration of wind energies in the power system

Ghadimi

Gholami

Miveh

2023

Energy Science & Engineering

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Conventional energy resource problems made power system planners apply more renewable energy sources (RESs) in the power system. RESs have a significant impact on fulfilling the world's energy demand, protecting the environment at least in the exploration phase, and providing energy reliability as well as security for the new generation of power grids. In this regard, wind power generation is considered a promising solution. However, by increasing the share of wind power generation units in the power sector, some challenges, such as voltage problems, transient stability, increasing system losses, and line congestions can occur. Consequently, an alternative solution is required to accelerate wind power units' connections to the grid by preventing the problems caused by the penetration of wind power. In this regard, Flexible Alternating Current Transmission Systems (FACTS) devices can play an important role while they can improve power grid dynamic performance. This paper presents a review of the optimization techniques applied to accelerate the penetration of wind energy by exploiting FACTS devices. The topic identifies the objectives and optimization formulations, as well as schemes and models available in the published literature. This survey gives noteworthy insights to the researchers to cover available solutions in these regards. The literature in the field is summarized in different aspects, such as FACTS technology, objective functions, constraints, optimization methods, planning or operation purposes, and load flow types. At each aspect, a comparison is derived to recognize the most important issues. The result of the review is the finding of future work and contributions which can be done in the field of wind energy integration acceleration using FACTS devices and the output of the paper can be used as a guide for researchers to find a new path for research in this area.

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Section: Different Wind Power Generationmentioning

confidence: 99%

Review of FACTS technologies and applications for accelerating penetration of wind energies in the power system

Ghadimi

Gholami

Miveh

2023

Energy Science & Engineering

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“…Angle of leading edge slat βis the main parameter considered. Based on previous studies by authors [21], slat chord length of 15mm is located upstream of the base airfoil with a chord length of 185mm at its tip taking into consideration that the total chord length is the sum of both which is 200mm. Slat is located at +18mm in y axis.…”

Section: Geometric Parametersmentioning

confidence: 99%

A study for the effect of slat installation on aerodynamic performance of S809 airfoil

Z.Zaki

Abdelrahman

Ayad

et al. 2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Leading edge slat is a device that is installed upstream of the main airfoil to control the flow over the airfoil passively or actively in order to improve its aerodynamic performance. The present study aims to investigate the effect of using leading edge slat on controlling the flow separation over the airfoil and hence the overall performance of the airfoil for small HAWT. Ansys 2019 software is used to numerically simulate the flow over S809 airfoil. According to NREL, S809 airfoil is a good choice for small HAWT. The current study considers the effect of angle of attack of the leading edge as a geometrical parameter which has an obvious effect on its performance. Based on previous study by the authors, slat of chord length of 15mm, is located at +18mm distance in y direction relative to the base airfoil chord which is 185mm, is studied while varying its installation angle β in range of -10⁰ to +10⁰. Slat angle of +5⁰ has the best effect on the performance of the airfoil. It moves the point of flow separation forward all the way to the trailing edge of the base airfoil. As a result of improving the flow behavior, lift coefficient is increased by 40% at AoA=17.2⁰ at the same angle relative to the condition without slat.

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“…2018 a , 2020), and over wing sections (Vinuesa, Örlü & Schlatter 2017; Zaki et al. 2022) where the backflow and the associated adverse pressure gradient (APG) led to flow separation on the wing. The backflow was also observed in turbulence transition by Wu, Cruickshank & Ghaemi (2020) in the late stage of bypass transition on a smooth, flat-plate boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Backflow structures in turbulent pipe flows at low to moderate Reynolds numbers

2023

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The statistical characteristics and the evolution of the backflow structures are investigated in wall-bounded flows at Reynolds numbers up to $Re_{\tau }=1000$ . The backflow is caused by the joining of large-scale high- and low-speed structures in the vicinity of the wall and is formed at the tail tip of the low-speed structure. The distribution density of the backflow structures and the percentage area of the backflow region on the wall both increase with the Reynolds number. The backflow structures have an average lifespan of 8 wall units which is found to be slightly longer in the pipe than the channel, and they are convected downstream at the average velocities of the buffer region of approximately 10 wall units, similar to Cardesa et al. (J. Fluid Mech., vol. 880, 2019, R3). The backflow structures occasionally split and merge, and can form detached from the wall. Evidence shows that the split, merged and wall-detached backflow structures are caused by the near-wall structures. The split backflow structures are on average, larger and more spanwise-elongated which are split due to the spanwise shearing of the near-wall streaks. A backflow structure is formed detached from the wall when the trailing end of its carrier low-speed structure ‘sits’ on the near-wall high-speed streaks. The wall-detached backflow structures tend to become wall-attached by approaching the wall when undergoing a similar life cycle to the normal backflow of growth and decay with spanwise elongation because the backflow region at the tail of the low-speed structure is continuously pressed down to the wall by the high-speed structure driven by persistent vortical structures in the buffer region.

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Effects of leading edge slat on the aerodynamic performance of low Reynolds number horizontal axis wind turbine

Cited by 25 publications

References 21 publications

Review of FACTS technologies and applications for accelerating penetration of wind energies in the power system

Review of FACTS technologies and applications for accelerating penetration of wind energies in the power system

A study for the effect of slat installation on aerodynamic performance of S809 airfoil

Backflow structures in turbulent pipe flows at low to moderate Reynolds numbers

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