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| Aerodynamic performance of H type vertical axis wind turbine under condition of low wind speed |
| Yang Congxin, Li Shoutu, Wang Xiuyong |
| School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract Based on independently developed airfoil of H type vertical axis wind turbines(H-VAWT)as the research object, the aerodynamic performance and three-dimensional effect of H-VAWT at the low wind speed condition are analyzed using the numerical simulation methods.The results showed that at the low wind speed condition, the change of the wind speed or rotating speed have a significant influence on the performance of the H-VAWT while keeping the tip speed ratio constant. The tip speed ratio is more sensitive than rotational speed considering the effect of wind speed. For the low wind speed case, H-VAWT works in the low tip speed ratio area,even if the rotational speed is high. Setting reasonable wind speed and rotational speed is necessary in the numerical simulation. Without considering the wind shear, three-dimensional effect is influenced by the tip vortex. The tip vortex mainly located in 0° azimuth angle play an important role. The three-dimensional effect is also influenced by the flow field inside, and the effect increases while the rotational speed increases. Further research on H-VAWT can use these results as references.
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Received: 18 December 2013
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