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| Numerical simulation on effects of number of blades with plate added at blade trailing edge on torque coefficient of vertical axis wind turbine |
| LI Yan1,2*, ZHAO Shouyang1, JIANG Yu1, FENG Fang1,2, ZHANG Tingting1 |
| 1.Engineering College of Northeast Agricultural University, Harbin, Heilongjiang 150030, China; 2.Heilongjiang Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Area, Harbin, Heilongjiang 150030, China |
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Abstract In order to explore the influence of number of blades with plate added at the blade trailing edge on the aerodynamic characteristics of vertical axis wind turbine(VAWT), the torque coefficient of a VAWT with various numbers of blades was analyzed. The improvement in the flow field around the turbine blade was identified under different conditions of number of blades. The torque characteristics and static starting performance were calculated by numerical simulation for a SB-VAWT with seven curved plate lengths for 2, 3 and 4 blades based on a typical airfoil NACA0018, which has been often used in VAWTs. The simulated results showed that the aerodynamic characteristics of this lift-type VAWT were affected by the number of blades and the length of the curved plate. The increasing plate length can improve the performance of the wind turbine due to the drag, but could suppress the change in torque coefficient due to the increase of number of blades. Under the condition of different numbers of blades, the optimum curved plate length can optimize the static starting performance of the wind turbine. At different numbers of blades, a properly extended curved plate can optimize the static starting performance of the turbine, but the optimized performance occurs at different azimuth angles. Specially, the optimized performance is the best when the number of blades is 2, and the average torque coefficient is increased by 40%. This study has provided a basis for the design and optimization of blade trailing edge for VAWTs.
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Received: 21 August 2017
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