Developed DMST model for performance analysis and parametric evaluation of Gorlov vertical axis wind turbines

Moghimi, Mahdi; Motawej, Hadi

doi:10.1016/j.seta.2019.100616

Cited by 22 publications

(17 citation statements)

References 30 publications

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“…Parallel to existing works, the power coefficients and average torques of straight and helical bladed turbines were found to be the same. However, when the instantaneous torque graph is analyzed (Figure 12), the torque oscillation of the helical turbines is observed to be lower than that of the straight bladed turbines parallel to the studies of Niblick [70], Marsh et al [67], Moghimi et al [68] and Winchester and Quayle [66]. Helical turbine blade segments are exposed to various different angles of attack at an instantaneous timestep.…”

Section: Effect Of Blade Helicitymentioning

confidence: 57%

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Investigating the Effect of Geometrical and Dynamic Parameters on the Performance of Darrieus Turbines: A Numerical Optimization Approach via QBlade Algorithm

Muratoğlu

Demir

2020

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Increasing energy demand, rising per capita energy use, growing climate problems and other detrimental consequences of energy and environmental issues have prompted scientists and engineers to conduct more studies on the technical feasibility and efficiency of renewable energy conversion systems. Free flow (wind and hydrokinetic) turbines are one of the mostly investigated renewable energy technologies and Darrieus turbines have an exceptional place especially for smaller scale and domestic applications. Many experimental and computational studies have been provided on the performance of Darrieus turbines. However, the number of numerical studies which are more time and cost effective than computational and experimental works are quite limited in the literature. The main objective of this study is to analyze Darrieus turbines at different geometrical and dynamic configurations using numerical QBlade software. In this study, the effect of airfoil selection, number of blades, chord length, solidity and helicity are analyzed in terms of delivering higher performance at straight bladed Darrieus turbines. It has been found that NACA 0020 profile performs better relative to other symmetrical blade sections in vertical axis turbines. Better performance and wider TSR range is obtained for three bladed turbines. Also, increasing chord lengths delivered maximum power at lower tip speed ratio (TSR) ranges. This study is expected contribute site-dependent Darrieus turbine design works at different dimension and dynamic scales for both wind and hydrokinetic applications.

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Section: Effect Of Blade Helicitymentioning

confidence: 57%

“…These turbines are formed by rotating the blades around their longitudinal axes to give a helical structure. Several studies [67,68] proposed that, straight bladed turbine deliver higher power than helical turbines. However, Al-Dabbagh and Yuce [31] found the efficiency of helical turbines to be slightly higher.…”

Section: Effect Of Blade Helicitymentioning

confidence: 99%

Investigating the Effect of Geometrical and Dynamic Parameters on the Performance of Darrieus Turbines: A Numerical Optimization Approach via QBlade Algorithm

Muratoğlu

Demir

2020

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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“…BEM simulations, such as those conducted herein, require only a few seconds or minutes to complete the same task. Although somewhat lacking in terms of flow-field predictions, BEM-type models are simpler, much faster, more reliable [42] and have been used extensively for design purposes. The drawback to BEM models is that they require a large set of aerodynamic performance data (i.e., lift and drag curves) across a wide range of Reynolds numbers (Re), which are often difficult to obtain.…”

Section: Methodsmentioning

confidence: 99%

Double-Multiple Streamtube Analysis of a Flexible Vertical Axis Wind Turbine

Roy

Kincaid

Mahmud

et al. 2021

Fluids

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Vertical-axis wind turbines (VAWTs) have drawn increased attention for off-grid and off-shore power generation due to inherent advantages over the more popular horizontal-axis wind turbines (HAWTs). Among these advantages are generator locale, omni-directionality and simplistic design. However, one major disadvantage is lower efficiency, which can be alleviated through blade pitching. Since each blade must transit both up- and down-stream each revolution, VAWT blade pitching techniques are not yet commonplace due to increased complexity and cost. Utilizing passively-morphing flexible blades can offer similar results as active pitching, requiring no sensors or actuators, and has shown promise in increasing VAWT performance in select cases. In this study, wind tunnel tests have been conducted with flexible and rigid-bladed NACA 0012 airfoils, in order to provide necessary input data for a Double-Multiple Stream-Tube (DMST) model. The results from this study indicate that a passively-morphing VAWT can achieve a maximum power coefficient (Cp) far exceeding that for a rigid-bladed VAWT CP (18.9% vs. 10%) with reduced normal force fluctuations as much as 6.9%. Operational range of tip-speed ratio also is observed to increase by a maximum of 40.3%.

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“…The below steps were followed using QBlade to reach the results. Based on the literature survey following numerical results are based upon [18]. The power is the same and the reverse of the torque, T, which would be the wind energy on the wind turbine.…”

Section: Methodsmentioning

confidence: 99%

DMST Approach for Analysis of 2 and 3 Bladed Type Darrieus Vertical Axis Wind Turbine

Roga¹,

Dubey²

2018

EAI Endorsed Transactions on Energy Web

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Wind energy has lately been one of the world's leading outlets of clean energy for producing power in potential environments across the globe. Academics currently undertake numerous analysis practices to improve and refine current wind turbine designs by means of advanced and diverse computational techniques. Various computations tools based on Computational fluid dynamics are available. However, these require a lot of computational time and hardware resources. On the other side, readily accessible basic methods like QBlade are computationally cheap and could be used for efficiency and design analysis of wind turbines on the horizontal and vertical axis. The present study is based on the variable pitch study of vertical axis wind turbine (VAWT) of straight blade NACA0018 airfoil for low speed utilizing QBlade software. The results are validated and compared with the experimental results and it was found to be in good agreement with them for TSR ranging from 1 to 6.

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Developed DMST model for performance analysis and parametric evaluation of Gorlov vertical axis wind turbines

Cited by 22 publications

References 30 publications

Investigating the Effect of Geometrical and Dynamic Parameters on the Performance of Darrieus Turbines: A Numerical Optimization Approach via QBlade Algorithm

Investigating the Effect of Geometrical and Dynamic Parameters on the Performance of Darrieus Turbines: A Numerical Optimization Approach via QBlade Algorithm

Double-Multiple Streamtube Analysis of a Flexible Vertical Axis Wind Turbine

DMST Approach for Analysis of 2 and 3 Bladed Type Darrieus Vertical Axis Wind Turbine

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