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| Influences of drag blade on aerodynamic performance of vertical-axis wind turbine with lift-drag compound rotor |
| QU Jianjun*, WANG Jingyuan, ZHAO Yue, ZHANG Lei |
| School of Mechatronics Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China |
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Abstract In order to obtain more energy from wind, the rotor size of vertical-axis wind turbines has been designed large by large. However, an enlarged rotor diameter can result in a difficulty for the rotor to start operation. A new type vertical-axis wind turbine with lift-drag compound rotor was proposed to solve this problem. Under the premise of keeping its lift blades unchanged, nine lift-drag compound rotors were established. The aerodynamics of the turbines with these rotors was numerically simulated by using Fluent. Influences of the drag blade radius and the distance L between the blade and the rotor shaft were studied based on the starting performance and operating efficiency. After the best combination of radius and position for the drag blade obtained, a comparison in performance was made with the lift type vertical-axis wind turbine. The results show that the starting performance of the wind turbine is better when the radius and the distance L get larger. In terms of operational efficiency, when the tip speed ratio is 0.5-1.0, the radius and the distance L exhibit a little effect on the power coefficient. When the tip speed ratio exceeds 1, however, increased two factors can reduce the power coefficient. Although the operation efficiency of the wind turbine with lift-drag compound rotor is a bit low, its startup performance has been improved obviously.
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Received: 26 August 2017
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