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Effect of solidity on aerodynamic forces around straight-bladed vertical axis wind turbine by wind tunnel experiments (depending on number of blades)

Author

Listed:
  • Li, Qing’an
  • Maeda, Takao
  • Kamada, Yasunari
  • Murata, Junsuke
  • Shimizu, Kento
  • Ogasawara, Tatsuhiko
  • Nakai, Alisa
  • Kasuya, Takuji

Abstract

The prediction of aerodynamic forces around straight-bladed Vertical Axis Wind Turbines (VAWT) is important for wind turbine applications. This paper focused on evaluating the aerodynamic forces acting on a single blade, depending on the different numbers of blades in wind tunnel experiments. In this study, numbers of blades were from two to five and the cross-sectional shape of the tested airfoil was a NACA0021. Firstly, the power coefficient was measured by a torque meter and a six-component balance. Secondly, pressures acting on the surface of rotor blades were measured during rotation by multiport pressure devices. Then, the evolutions of normal coefficient, tangential coefficient and lift-to-drag ratio CL/CD, which were obtained from pressure distributions, were discussed. Finally, the power coefficients calculated by pressure distributions were compared with the experiment data of the torque meter and the six-component balance. The results showed that the pressure difference substantially decreased with the increase of solidity. In addition, the values of six-component balance and torque meter showed smaller values than those calculated by pressure distributions. In words, these results provided theoretical significance towards the development of a simple design for straight-bladed VAWT.

Suggested Citation

  • Li, Qing’an & Maeda, Takao & Kamada, Yasunari & Murata, Junsuke & Shimizu, Kento & Ogasawara, Tatsuhiko & Nakai, Alisa & Kasuya, Takuji, 2016. "Effect of solidity on aerodynamic forces around straight-bladed vertical axis wind turbine by wind tunnel experiments (depending on number of blades)," Renewable Energy, Elsevier, vol. 96(PA), pages 928-939.
    • Handle: RePEc:eee:renene:v:96:y:2016:i:pa:p:928-939
    DOI: 10.1016/j.renene.2016.05.054
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    References listed on IDEAS

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