Shape optimization and experimental validation of a drag vertical axis wind turbine

Ramadan, Ahmed; Yousef, Khaled; Said, Mohamad Syazarudin Md; Mohamed, Mohamed H.

doi:10.1016/j.energy.2018.03.117

Cited by 64 publications

(14 citation statements)

References 23 publications

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“…ese techniques ware utilized in various applications by one of the authors of this paper in the drag and lift vertical turbines [15][16][17][18][19]. Calì et al [20] offered a method that enhanced recognizing of the influences of panel arrangements and fibre orientations on sail performances.…”

Section: Methodology and Model Validationmentioning

confidence: 99%

Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine

Alqurashi

Mohamed

2020

Modelling and Simulation in Engineering

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Darrieus wind rotor is a vertical axis wind turbine that is a very promising kind of wind converters at remote and domestic locations that have soft and weak wind potential and speed, but from the quantitative comparison with horizontal axis wind turbines, this type of turbines has a weak performance. Additional researches are still needed to develop its efficiency to identify all the requirements of the generated power in low power demands. The aim of the current investigation is to analyze all the acting forces on the main parts of Darrieus rotor over the rotations as well as in maintenance and stationary conditions. Aerodynamic forces assessment will be executed for 3 different blade shapes (nonsymmetric and symmetric airfoils) like the airfoil section shapes of the Darrieus rotor blades. NACA 0021, LS413, and S1046 are selected as cross-sectional profile in this work. CFD simulations have been used in this work to get the different aerodynamic forces on the rotor blades of the Darrieus turbines. The present results indicated that the symmetric S1046 blade has higher forces during the rotation and stagnant (static) conditions. Moreover, the self-starting capability of NACA 0021 is better than S1046 due to low aerodynamic torsion on the S1046 blades.

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Section: Methodology and Model Validationmentioning

confidence: 99%

Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine

Alqurashi

Mohamed

2020

Modelling and Simulation in Engineering

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“…Karena sifatnya yang stochastic, metode Algoritma genetik melakukan pendekatan "pencarian acak" untuk menemukan titik solusi yang paling optimum. Selain itu, metode ini bersifat sangat umum, sehingga metode ini telah di aplikasikan pada berbagai bidang [10][11][12][13][14][15]. Pada penelitian ini 11, 13 dan 15 variabel desain digunakan untuk melihat sensitivitas desain variable tersebut terhadap hasil optimasi seperti terlihat pada Gambar 1.…”

Section: Pendahuluanunclassified

Optimasi Bentuk Struktur Elemen Cangkang Pada Pondasi Terapung Menggunakan Metode Algoritma Genetik

Adha

Kurniawan

2018

SAINTIS

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AbstrakPrinsip dasar pondasi terapung adalah keseimbangan antara berat struktur atas dan total berat tanah (termasuk didalamnya air tanah) yang dipindahkan oleh konstruksi pondasi. Pondasi terapung sangat baik digunakan pada daerah dengan daya dukung tanah yang rendah dikarenakan pondasi terapung membagi gaya ke area kontak yang sangat besar sehingga seluruh area kontak tersebut hanya mengalami tegangan yang relatif kecil. Oleh karena itu, sangat penting untuk mendesain bentuk pondasi terapung yang mampu memberikan gaya apung terbesar dengan kemampuan menghasilkan tegangan yang rendah pada bidang kontak.Paper ini membahas optimasi bentuk pelat cangkang yang digunakan pada pondasi terapung agar memiliki daya dukung yang cukup untuk menahan gaya yang ditransferkan oleh struktur atas. Metode algoritma genetik digunakan dalam proses optimasi dimana koordinat dari titik yang menyusun bentuk (shape) struktur cangkang (c n ) dipakai sebagai desain variabel. Tegangan yang terjadi pada struktur cangkang tersebut di evaluasi dengan Analisa Elemen Hingga dengan perilaku element cangkang seperti model teory pelat Reissner-Midlin. AbstractThe basic principle of floating foundation is counterforce balancing between the weight of the structure and the total weight of the soil (including groundwater) which is displaced by the structure. Floating foundation is effective in areas with low soil bearing capacity because the external load is widely spread that resulting lower stress level in contact area; Hence, it is necessary to design the shape of floating structure that provide adequate uplift whilst also create lower stress level by spreading the external load to wider contact area. This paper discusses the shape optimization of the floating foundations to have sufficient capacity to resist the force transferred by the upper structure whilst also minimize the use of material without resulting element overstress. Genetic algorithm method is used in the optimization process where the coordinates of the points that shape the shell structure (c n ) are used as variable designs. In this study, the multivariable optimization using finite element model is investigated . The stress that occurs in the shell structure is evaluated by Finite Element Analysis with the behavior of shell elements based on Reissner-Mindlin plate theory.

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“…The advantages of wind energy are cleanliness and negligible safety issues, and this is one of the fastest-growing energy resources in the world [ 4 ], ensuring a ready supply of wind turbine equipment [ 5 ]. Wind turbines are primarily used to capture wind energy for the purpose of generating power [ 6 , 7 ]. Generally, the wind turbines fall into two categories: horizontal and vertical axis turbines.…”

Section: Introductionmentioning

confidence: 99%

“…A combined Savonius wind turbine has been reported to have a maximum power coefficient of 0.4 with a required start-up torque rated at more than 0.1 Nm at low-speed winds of 2 m/s [ 14 , 15 ]. The Darrieus-Savonius blade performance is affected by configurational conditions, geometry, and air flow parameters, and the number of blades also affects the power efficiency [ 7 , 10 ]. The wind turbine blade is a critical component made of polymeric composites.…”

Section: Introductionmentioning

confidence: 99%

Novel Engineered Materials: Epoxy Resin Nanocomposite Reinforced with Modified Epoxidized Natural Rubber and Fibers for Low Speed Wind Turbine Blades

Kasagepongsan

Suchat

2021

Polymers

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The objective of this study was to investigate nanocomposite materials with good outdoor resistance for wind turbine blade application. The nanocomposites based on epoxy resin with 5% of epoxidized natural rubber (ENR 50), 3% of nanofiller, and glass fibers, were subjected to experiments. The weathering resistance of nanocomposites was evaluated from the change in mechanical properties caused by accelerated aging, induced by UVB radiation in a weathering chamber. The accelerated aging improved tensile strength by about 35% at 168 h of exposure to UVB, via a curing effect. The nanocomposites were optimized for all the parts of wind turbine blades (Savonius and Darrieus types) that are generally designed for high strength, low weight, weathering resistance, and low rotational speed (2 m/s). A tree wind turbine with nanocomposite blades produced 5 kW power output when tested. Based on the findings in this work, the innovative nanocomposites have potential in manufacturing wind turbines to generate electricity.

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Shape optimization and experimental validation of a drag vertical axis wind turbine

Cited by 64 publications

References 23 publications

Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine

Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine

Optimasi Bentuk Struktur Elemen Cangkang Pada Pondasi Terapung Menggunakan Metode Algoritma Genetik

Novel Engineered Materials: Epoxy Resin Nanocomposite Reinforced with Modified Epoxidized Natural Rubber and Fibers for Low Speed Wind Turbine Blades

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