Numerical and Experimental Study on Performance Enhancement of Darrieus Vertical Axis Wind Turbine With Wingtip Devices

Mishra, Nishant; Gupta, Anand Sagar; Dawar, Jishnav; Kumar, Alok; Mitra, Santanu

doi:10.1115/1.4040506

Cited by 32 publications

(12 citation statements)

References 10 publications

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“…This downwash reduces the effective angle of attack of the wing and inclines the lift vector backward, producing an additional force component (i.e. induced drag) in the drag direction [58,59]. The reduction of induced drag is essential for aircraft.…”

Section: Basic Theories Of Induced Drag and Wingtip Devicesmentioning

confidence: 99%

“…Compared to the above passive control methods on the account of load correction, there are active control strategies that affect the vortexes through the force of actuators. These methods include morphed wings [54,55], wing blowing (chordwise or spanwise) [80,81], synthetic jets or plasma jets actuators, and are also used in others fields such as wind turbines [58]. The selection of the passive control devices or active control devices depends on the specific situation and the airplane type.…”

Section: Basic Theories Of Induced Drag and Wingtip Devicesmentioning

confidence: 99%

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A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

et al. 2021

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Wingtip slots, where the outer primary feathers of birds split and spread vertically, are regarded as an evolved favorable feature that could effectively improve their aerodynamic performance. They have inspired many to perform experiments and simulations as well as to relate their results to aircraft design. This paper aims to provide guidance for the research on the aerodynamic mechanism of wingtip slots. Following a review of previous wingtip slot research, four imperfections are put forward: vacancies in research content, inconsistencies in research conclusions, limitations of early research methods, and shortage of the aerodynamic mechanism analysis. On this basis, further explorations and expansion of the influence factors for steady state are needed; more attention should be poured into the application of flow field integration method to decompose drag, and evaluation of variation in induced drag seems a more rational choice. Geometric and kinematic parameters of wingtip slot structure in the unsteady state, as well as the flexibility of wingtips, should be taken into account. As for the aerodynamic mechanism of wingtip slots, the emphasis can be placed on the study of the formation, development, and evolution of wingtip vortices on slotted wings. Besides, some research strategies and feasibility analyses are proposed for each part of the research.

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Section: Basic Theories Of Induced Drag and Wingtip Devicesmentioning

confidence: 99%

Section: Basic Theories Of Induced Drag and Wingtip Devicesmentioning

confidence: 99%

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

et al. 2021

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“…Some others have proposed ways to change the blade shape for tip vortex reduction, such as a helical blade [14,15] and elliptical blade tip [16,17].The installation of a tip device is also a method to improve the turbine performance. Winglets and bulkheads are mostly used in experiments and simulations [16][17][18][19]. Considering the 3D effect caused by supporting strut, some research was undertaken in terms of the cross section and location of the strut [8,16,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Blade Tip Shape for Improving VAWT Performance

Jiang

Zhao

et al. 2020

JMSE

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Vertical axis wind turbine (VAWT) is a competitive power generation device due to structural simplicity, wind direction independence, no yaw mechanism required, easier maintenance, and lower noise emission. However, blade tip vortex will be generated at both ends of the blade during the rotation, resulting in torque loss and efficiency reduction. In this paper, computational fluid dynamics is used to study blade tip vortex and its reduction technique of a single-blade VAWT rotor in real scale. By monitoring the force and flow field at different heights of the blade, the influence ranges of tip vortex are obtained. The reduction effect of the bulkhead obtained from the blade profile curve is studied, and the size of the bulkhead is optimized. On the basis of adding the optimal bulkhead, the influence of the supporting strut is also explored. The joint action is obtained by changing the location of the supporting strut. The results show that the top supporting strut-bulkhead structure is the optimal position. The power-extraction efficiency of the rotor with this integrated structure is significantly improved at optimal tip speed ratios (TSRs) and higher TSRs.

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“…Several attempts have been made by researchers to improve the VAWT efficiency by minimizing the impact of tip vortices on the turbine blade. One of the most effective methods is by adding endplates to the blade [9,[11][12][13][14][15][16][17][18][19]]. An endplate is a thin piece of object that is attached to the end tip to minimize the end tip leakage vortex by preventing the air from the high-pressure side from bypassing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Power Performance of the Vertical-Axis Wind Turbine with Endplates

Khai

Mohammad²,

Fazlizan³

et al. 2022

CFDL

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An H-rotor vertical axis wind turbine (VAWTs) can operate independently in any wind direction, making it aerodynamically efficient and suitable to harness wind energy in low wind speed areas. The aerodynamic efficiency of VAWTs is highly dependent on the blade geometry, especially the blade tip. Tip vortices produced at the blade tips can negatively affect the VAWT’s aerodynamic efficiency. Adding endplates to the blade tips can minimize the effects of tip vortices on VAWTs. In this paper, several endplate designs are used to evaluate the effectiveness in improving the power coefficient, Cp of a VAWT at three different tip speed ratios (TSRs) using three-dimensional computational fluid dynamics (3D CFD) simulation. The power coefficients of VAWTs with endplates are compared with the baseline model with the same geometrical parameters where the baseline VAWT model is based on the experimental model from the literature. Since the focus of this study is on the blade tip design, a simplified 3D VAWT model is used where the supporting shaft and arms of the VAWT are excluded to reduce the needed computational capacity. Among the various endplate designs used in this study, the semi-circular inward endplate (ED3) with a diameter equivalent to 1.2 blade chord length showed the best improvement in the Cp which is by 7.45%, and 5.79% for at the TSRs of 2.19 and 2.58, respectively. The pressure difference on both sides of the blade was also examined. The results revealed that the endplate can prevent the flow from bypassing the blade tip, hence, preventing the occurrence of tip vortices while improving the aerodynamic efficiency near the blade tip, ultimately, improving the overall Cp of a VAWT.

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Numerical and Experimental Study on Performance Enhancement of Darrieus Vertical Axis Wind Turbine With Wingtip Devices

Cited by 32 publications

References 10 publications

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

A Brief Review on Aerodynamic Performance of Wingtip Slots and Research Prospect

Investigation of Blade Tip Shape for Improving VAWT Performance

Numerical Investigation of the Power Performance of the Vertical-Axis Wind Turbine with Endplates

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