论文部分内容阅读
为解决现有垂直轴风力机风能利用率较低问题,以获得风轮最大切向力为目标,分别获得了风轮上风区和下风区叶片的最佳理论攻角为8°和-8°,计算出了叶片一周桨距角调节策略。在此基础上,采用随机方向法对双曲柄变桨机构进行了优化设计,得到了不同叶尖速比下变桨机构的参数组合。为验证垂直轴风轮变桨机构的合理性,以叶尖速比2为例,利用ADAMS软件对变桨机构模型进行了运动学特性仿真,并采用旋转测角法对叶片桨距角变化曲线进行了数据拟合,计算结果显示:实际桨距角变化曲线与理想变桨曲线的贴合程度较高。风洞试验进一步证明:所设计的变桨距垂直轴风力机具有更好的自启动性能,且在现有风速下比定桨距垂直轴风力机的发电效率至少提高了7.86%。
In order to solve the problem of low utilization of wind energy in existing vertical axis wind turbines, the best theoretical angles of attack for the blades in the windward and leeward regions of the wind turbine are 8 ° and -8 °, respectively, with the goal of obtaining the maximum tangential force of the wind turbine. , Calculated blade pitch angle adjustment strategy. Based on this, the optimal design of the double-crank pitch mechanism is carried out by random direction method, and the parameter combination of the pitch-varying mechanism under different tip-to-tip ratios is obtained. In order to verify the rationality of the vertical axis wind turbine pitch mechanism, taking the tip speed ratio 2 as an example, the kinematics characteristics of the pitch mechanism model are simulated by using ADAMS software, and the change of blade pitch angle curve The data fitting is carried out. The calculation results show that the actual pitch angle curve is in good agreement with the ideal pitch curve. The wind tunnel test further proves that the designed pitch vertical axis wind turbine has better self-starting performance and at least 7.86% more efficiency than the pitch-pitch vertical axis wind turbine at the existing wind speed.