%A LI Yan,*, WU Zhicheng, TAGAWA Kotaro, FENG Fang,, ZHANG Tingting, BAI Rongbin, LI JianyeŠĪ %T Numerical simulation on aerodynamic characteristics of vertical axis wind turbine with eccentric rotor structure %0 Journal Article %D 2018 %J Journal of Drainage and Irrigation Machinery Engin %R 10.3969/j.issn.1674-8530.17.0023 %P 413-419 %V 36 %N 5 %U {http://zzs.ujs.edu.cn/pgjx/CN/abstract/article_2440.shtml} %8 2018-05-25 %X A rotor with eccentric structure was proposed in order to improve the performance of straight-bladed vertical axis wind turbine(SB-VAWT). Then, the self-starting capacity and output power were enhanced by increasing the effective acting radius of blade on the rotor shaft. Numerical simulations were carried out on a SB-VAWT rotor with six eccentricities, respectively. NACA0018 airfoil was used as rotor blade section profile. The starting torque and power coefficients were predicted. The effects of eccentricity on the aerodynamic performance were analyzed. The simulated results show that a proper eccentricity can diminish negative starting torque coefficient in some degrees at a few azimuth angles, resulting in a smooth torque coefficient curve. Consequently, the starting performance of SB-VAWT is improved effectively. Furthermore, a suitable eccentricity can increase the rotor output po-wer, and the maximum power coefficient can be raised as high as 12% compared with an ordinary rotor.ŠĪ