Design and Analysis of Variable-pitch Mechanism of Vertical-axis Tidal turbine

Fankai Kong, Weiming Su, Hua-qiu Ding
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Abstract

As the kernel part of the vertical-axis tidal turbine, variable-pitch mechanism determines the self-startup ability and energy capture efficiency of the turbine. In order to improve the energy capture efficiency, a variable-pitch mechanism of tidal turbine based on the principle of space lever is proposed. The motion simulation is carried out by using PRO/E. The rationality and correctness of variable-pitch mechanism design are verified by comparing the motion simulation curve with the theoretical diagram. The forces acting on the blades at every position in a rotating cycle with different eccentricity are analyzed by using FLUENT, and the torque of each blade to the center of rotation and its synthetic torque are obtained which provides date for the dynamic analysis of the variable-pitch mechanism. The power bond graph method is used to analyze the dynamic characteristics. It’s proved that the turbine with variable-pitch mechanism has higher energy capture efficiency. The first ten natural frequencies are obtained by model analysis of the key components of the variable-pitch mechanism. By comparing with the tidal load frequency and the impeller rotation frequency, it is proved that there is no danger of resonance in the variable-pitch mechanism of the tidal turbine.
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垂直轴潮汐水轮机变桨距机构设计与分析
变螺距机构是垂直轴潮汐能水轮机的核心部件,它决定着水轮机的自启动能力和能量捕获效率。为了提高潮汐能水轮机的能量捕获效率,提出了一种基于空间杠杆原理的变桨距机构。采用PRO/E软件进行运动仿真。通过运动仿真曲线与理论图的对比,验证了变螺距机构设计的合理性和正确性。利用FLUENT软件分析了不同偏心距下叶片在一个旋转周期内各位置所受的力,得到了各叶片对旋转中心的转矩及其综合转矩,为变节距机构的动力学分析提供了数据。采用功率键合图法对其动态特性进行分析。实验证明,采用变螺距机构的水轮机具有较高的能量捕获效率。通过对变基音机构关键部件的模型分析,得到了前十个固有频率。通过与潮汐负荷频率和叶轮旋转频率的比较,证明了该变螺距机构不存在共振危险。
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