Novel investigation of the different Omni-direction-guide-vane angles effects on the urban vertical axis wind turbine output power via three-dimensional numerical simulation

Shahizare, Behzad; Ghazali, Nik Nazri Nik; Chong, Wen Tong; Tabatabaeikia, Seyedsaeed; Izadyar, Nima; Esmaeilzadeh, Alireza

doi:10.1016/j.enconman.2016.03.034

Cited by 70 publications

(32 citation statements)

References 26 publications

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“…The results indicate that the optimized blade pitch with pitch variations from 45 + to 10 + improves turbine performance for a TSR of 0 < l < 3. Shahizare et al [21] studied the output power of VAWTs in urban areas by examining the effects of the omnidirectional angle. Gharali and Johnso [22] and Almohammadi et al [23] studied the 2D dynamic stall of a blade and a complete straight blade respectively, and Gharali stated that a threedimensional (3D) model was a better choice for studying the dynamic stall phenomenon.…”

Section: Review Analysismentioning

confidence: 99%

Experimental and numerical analysis of a novel Darrieus rotor with variable pitch mechanism at low TSR

Zouzou

Dobrev

Massouh

et al. 2019

Energy

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a b s t r a c tThe Darrieus vertical axis wind-turbine (VAWT) has been the subject of numerous recent studies aimed at improving its aerodynamic performance in order to locate it in urban areas. This article is devoted to the study of an original VAWT with variable-pitch and low tip speed ratio TSR which is favorable to noise reduction and can operate at low velocity wind. The aerodynamic performance of this turbine is studied experimentally in wind tunnel as well as by CFD. In order to obtain the 3D-flow field around the wind turbine rotor, the numerical simulations are performed by means of detached eddy simulation method (DES). The simulation of pitch variation is made possible by using sliding-mesh method. Thus a specially created program adapts the pitch depending on the blade azimuthal position during rotation. The obtained results show that adapted pitch blades are preferable because they permit to obtain a power coefficient Cp that rivals other VAWT in the case of TSR < 1. The maximum torque fluctuation during rotation is lower in the case of adapted variable-pitch compared to fixed-pitch and thus the maximum aerodynamic loads on the structure can be reduced. Moreover, the pitch adaptation leads to lower interaction effects between the upstream-blade wake and down-stream blades.

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Section: Review Analysismentioning

confidence: 99%

Experimental and numerical analysis of a novel Darrieus rotor with variable pitch mechanism at low TSR

Zouzou

Dobrev

Massouh

et al. 2019

Energy

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“…The use of a guide-vane [27] may prevent the drag effect on the blades moving in the upwind zone of the wind turbine, optimizing the wind flow in the downwind zone to maximize the lift forces on the blades. The guide-vanes increase the turbine solidity, leading to higher forces to be exerted in the pole.…”

Section: Guide-vanesmentioning

confidence: 99%

“…By applying (25) and (26) to the given x and y coordinates, the opposite side and the adjacent side are obtained. By applying (27), the length of the airfoil surface exposed to the wind forces can be obtained. Also, using (28) and (29), the pr C angle in relation to the blade chord line  is determined.…”

Section: Fig 10 Naca0012 Naca0018 Naca0020 Naca0025 and Naca0030 mentioning

confidence: 99%

Darrieus vertical axis wind turbines: methodology to study the self-start capabilities considering symmetric and asymmetric airfoils

Batista¹,

Melício²,

Mendes³

2018

Res. Eng. Struct. Mat.

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Disclaimer All the opinions and statements expressed in the papers are on the responsibility of author(s) and are not to be regarded as those of the journal of Research on Engineering Structures and Materials (RESM) organization or related parties. The publishers make no warranty, explicit or implied, or make any representation with respect to the contents of any article will be complete or accurate or up to date. The accuracy of any instructions, equations, or other information should be independently verified. The publisher and related parties shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with use of the information given in the journal or related means.

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“…Tip speed ratio. Tip speed ratioðk) is referred as a ratio of the rotational velocity of blade tips over wind speed (m/s) that can be expressed as (Shahizare et al, 2016) k…”

Section: Wind Farm Performance Analysis Modelmentioning

confidence: 99%

Assessment of the apparent performance characterization along with levelized cost of energy of wind power plants considering real data

Hulio

Jiang

2018

Energy Exploration & Exploitation

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Pakistan pursued the renewable energy policy to minimize the cost of energy per kWh as well as dependence on costly imported oil. Jhimpir site is termed as wind corridor and has tremendous proven wind power potential. The site is hosted for the first installed wind power plant. The aim of paper is to investigate the performance and levelized cost of energy of a wind farm. The methodology covers assessment of wind characteristics, performance function and levelized cost of energy model. The measured mean wind speed was found to be 8 m/s at 80 m above the ground level. The average values of standard deviation, Weibull k and c parameters, obtained using entire data set, were found to be 2.563, 3.360 and 8.940 m/s at 80 m. Performance assessment including technical, real availability and average capacity factor was found to be 97, 90 and 34.50%, respectively. It is evident that the power coefficient dropped if wind speed crosses the rated power. So it can be concluded that the efficiency of wind turbine decreased by increased wind speed. Tip speed ratio shows that a wind turbine operating close to optimal lift and drag will exhibit the performance level. Wind turbine performs better at the wind speed between 6 and 10 m/s. The estimated average levelized cost of energy was US $0.11371 and US $0.04092/kWh for 1-10 and 11-20 years, respectively. This makes it competitive in terms of low production cost per kWh to other energy technologies.

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Novel investigation of the different Omni-direction-guide-vane angles effects on the urban vertical axis wind turbine output power via three-dimensional numerical simulation

Cited by 70 publications

References 26 publications

Experimental and numerical analysis of a novel Darrieus rotor with variable pitch mechanism at low TSR

Experimental and numerical analysis of a novel Darrieus rotor with variable pitch mechanism at low TSR

Darrieus vertical axis wind turbines: methodology to study the self-start capabilities considering symmetric and asymmetric airfoils

Assessment of the apparent performance characterization along with levelized cost of energy of wind power plants considering real data

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