Bladelets—Winglets on Blades of Wind Turbines: A Multiobjective Design Optimization Study

Reddy, Sohail R.; Dulikravich, George S.; Sobieczky, H.; González, Manuel

doi:10.1115/1.4043657

Cited by 15 publications

(24 citation statements)

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“…Results show that the blade with backward sweep increased the power around 1.5% and with downstream winglet increased the power by around 1.3% compared to the baseline straight blade. Reddy et al 8 carried out shape-design optimization for designing the winglet of HAWT. The presence of an optimized winglet increased the power coefficient by 4.5% and increased the axial thrust force coefficient by 4%; however, the blade-twisting moment is still the same.…”

Section: Introductionmentioning

confidence: 99%

The effect of using winglets to enhance the performance of swept blades of a horizontal axis wind turbine

Khalafallah

Ahmed

Emam

2019

Advances in Mechanical Engineering

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One of the recent methods to improve the performance of horizontal axis wind turbine is to attach a winglet at the tip of the blade of these turbines. Winglets reduce the effect of vortex flow at the blade tip and thus improve the performance of the blade. This article presents a parametric study using the computational fluid dynamics (CFD) modeling to investigate the capability of a winglet to increase the turbine power of swept blades as well as straight blades of a horizontal axis wind turbine. The effects of winglet direction, cant angle, and twist angle are studied for two winglet orientations: upstream and downstream directions. The numerical simulation was performed using ANSYS Fluent computational fluid dynamics code. A three-dimensional computational domain, cylindrical rotationally periodic, was used in the computations. The k-ω shear-stress transport turbulence model was adopted to demonstrate turbulence in the flow. Results show that horizontal axis wind turbine with winglet and sweep could enhance more power compared to their equivalent straight or swept blade. The best improvement in the coefficient of power is 4.39% at design tip speed ratio. This is achieved for downstream swept blades with winglets pointing in the upstream direction and having cant and twist angles of 40° and 10°, respectively.

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Section: Introductionmentioning

confidence: 99%

The effect of using winglets to enhance the performance of swept blades of a horizontal axis wind turbine

Khalafallah

Ahmed

Emam

2019

Advances in Mechanical Engineering

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“…Uma otimização multiobjetiva de winglets para HAWT foi realizada por Reddy et al (2019). Suas funções objetivo eram de maximizar o coeficiente de potência e minimizar os coeficientes de empuxo e de momento torsor da pá.…”

Section: Histórico De Dispositivos De Ponta De Pás E O Estado Da Arteunclassified

“…Hansen e Mühle (2018) e Reddy et al (2019) realizaram pesquisas de otimização da geometria de winglets e informam apenas os valores finais da geometria, impossibilitando inferir como as diferenças nos comprimentos influenciam na performance da turbina.…”

Section: Comprimentounclassified

“…Nenhum estudo foi encontrado que estudasse explicitamente o efeito do tamanho da corda da raiz ou do afilamento de winglet na performance aerodinâmica de uma turbina eólica. Entretanto, os estudos de otimização de Hansen e Mühle (2018) e Reddy et al (2019) possuem estes parâmetros como variáveis, mas, novamente, não é possível saber como o comportamento ocorre em função deles. No primeiro trabalho, foi estudado uma variação de 35% a 100% na corda da raiz e 0,5 a 1 de afilamento e, no estudo de Reddy et al (2019), a variação do filamento foi de 0,1 a 1, enquanto a corda da raiz era fixa em 100%.…”

Section: Corda Da Raiz E Afilamentounclassified

“…Entretanto, os estudos de otimização de Hansen e Mühle (2018) e Reddy et al (2019) possuem estes parâmetros como variáveis, mas, novamente, não é possível saber como o comportamento ocorre em função deles. No primeiro trabalho, foi estudado uma variação de 35% a 100% na corda da raiz e 0,5 a 1 de afilamento e, no estudo de Reddy et al (2019), a variação do filamento foi de 0,1 a 1, enquanto a corda da raiz era fixa em 100%. Assim como as variáveis anteriores, os valores ótimos encontrados foram intermediários a faixa permitida, sendo c w,r = 58% e k w = 0, 88 em Hansen e Mühle (2018) e k w = 0, 7 em Reddy et al (2019), o que pode indicar que existe um valor que otimiza o aumento do coeficiente de potência.…”

Section: Corda Da Raiz E Afilamentounclassified

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Análise paramétrica da geometria de >i<winglets>/i< na eficiência aerodinâmica para uma pá de gerador eólico de eixo horizontal

Ribeiro¹

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Dedico esta dissertação à ciência e que ela sirva como contribuição para pesquisas futuras e para o desenvolvimento de tecnologias que melhoram a qualidade de vida do ser humano, tendo sempre em consideração o meio ambiente e a ética. "A ciência de hoje é a tecnologia de amanhã" Edward Teller "Não existe nada mais fatal para o pensamento que o ensino das respostas certas. Para isto existem as escolas: não para ensinar as respostas, mas para ensinar as perguntas. As respostas nos permitem andar sobre terra firme. Mas somente as perguntas nos permitem entrar pelo mar desconhecido." Rubem Alves "The mind once enlightned cannot again become dark" Thomas Paine RESUMO RIBEIRO, D. G. Análise paramétrica da geometria de winglets na eficiência aerodinâmica para uma pá de gerador eólico de eixo horizontal. 2020. 167p.

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Performance investigation and energy production of a novel horizontal axis wind turbine with winglet

Verma

Paul

Jain

2021

Intl J of Energy Research

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Summary This study mainly focuses on improving the aerodynamic performance, analysing the turbulence effect and structural response of the horizontal axis wind turbine (HAWT) blade for energy production. The baseline blade geometry is modified using a winglet at the blade's tip to enhance aerodynamic efficiency. Adding a winglet to the blade tip improves the power performance by 4.2% to 25% at different wind speeds. This paper aims to investigate the turbulence effect on a HAWT blade without and with a winglet at the tip using numerical analysis. The results found that the overall performance of the wind turbine can be influenced depending upon the turbulence intensity. The torque generation is reduced by 11% and 8.54% for a baseline blade and blade with winglet, respectively, if turbulent intensity is increased by 10 times (from 3% to 30%). Furthermore, adding a winglet at the tip of the blade increases the weight of the wind turbine system and aeroelastic instability. The one‐way fluid‐structure interaction approach is used to study the aeroelastic effect. Three cases of varying tip speed ratios and two material properties are assessed for HAWT blades without and with winglet. Further, the results show that the total deformation and von Mises stress are within the permissible limits for both the materials studied.

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Bladelets—Winglets on Blades of Wind Turbines: A Multiobjective Design Optimization Study

Cited by 15 publications

References 15 publications

The effect of using winglets to enhance the performance of swept blades of a horizontal axis wind turbine

The effect of using winglets to enhance the performance of swept blades of a horizontal axis wind turbine

Análise paramétrica da geometria de >i<winglets>/i< na eficiência aerodinâmica para uma pá de gerador eólico de eixo horizontal

Performance investigation and energy production of a novel horizontal axis wind turbine with winglet

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