Numerical Investigation the Effect of the Different Tip Vanes on the Loading of an H-VAWT

Li, Shoutu; Wang, Yin; Yang, Congxin; Li, Ye

doi:10.1051/e3sconf/20185303041

Cited by 4 publications

(2 citation statements)

References 13 publications

(11 reference statements)

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“…Mie-type tip vane and end plate have been proved to be effective in weakening the tip vortices and enhance the power performance of both HAWTs and VAWTs [26][27][28][29][30]. However, the vane results in increasing the fatigue loading and decreasing the lifetime for the VAWT [31]. Among these devices, the winglet performs better in terms of improving the power coefficient [31,32].…”

Section: Influence Of 3-d Effects On the Performance Of Vawtsmentioning

confidence: 99%

“…However, the vane results in increasing the fatigue loading and decreasing the lifetime for the VAWT [31]. Among these devices, the winglet performs better in terms of improving the power coefficient [31,32]. Although these tip devices have been proposed, more detailed studies are still limited in comparison with the study on the HAWT.…”

Section: Influence Of 3-d Effects On the Performance Of Vawtsmentioning

confidence: 99%

See 1 more Smart Citation

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Zhang

Elsakka

Huang

et al. 2019

Energy Conversion and Management

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Vertical axis wind turbines (VAWTs) have been attracting an increasing attention in recent years because of their potential for effectively using wind energy. The tip vortices from the VAWT blades have a negative impact on the power efficiency. Since a winglet has been proved to be effective in decreasing the tip vortex in the aerospace field, this paper numerically studies the aerodynamic effect of appending a winglet on the blade of a VAWT. Based on the theoretical motion pattern of the VAWT blade, this paper simplifies the three-dimensional fullscale rotor simulation to a one-blade oscillating problem in order to reduce the computational cost. The full rotor model simulation is also used in validating the result. The numerical approach has been validated by the experimental data that is available in the open literature. Six parameters are applied in defining the configuration of the winglet. The orthogonal experimental design (OED) approach is adopted in this paper to determine the significance of the design parameters that affect the rotor's power coefficient. The OED results show that the twist angle of the winglet is the most significant factor that affects the winglet's performance. A range analysis of the OED results produces an optimal variable arrangement in the current scope, and the winglet's performance in this variable arrangement is compared with the blade without a winglet. For the single blade study, the comparison result shows that the optimal 2 winglet can decrease the tip vortices and improve the blade's power performance by up to 31% at a tip speed ratio of 2.29. However, for the full VAWT case, the relative enhancement in the power coefficient is about 10.5, 6.7, and 10.0% for TSRs of 1.85, 2.29, and 2.52, respectively. The winglet assists in maintain the pressure difference between the two sides of the blade, thus weakening the tip vortex and improving the aerodynamic efficiency of the surface near the blade tip.

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