Investigation on Darrieus type straight blade vertical axis wind turbine with flexible blade
Investigation on Darrieus type straight blade vertical axis wind turbine with flexible blade
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DOI：
10.1016/j.oceaneng.2015.10.027
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发表时间：
2015-12
影响因子：
5
通讯作者：
Wendi Liu;Q. Xiao
中科院分区：
文献类型：
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作者：
Wendi Liu;Q. Xiao
在这项研究中，三维垂直轴风力机与展向被动变形柔性叶片已建模。研究主要集中在分析叶片结构特性与弯扭变形的关系。两种类型的柔性叶片材料和两个支柱的位置支持H型叶片正在调查。本文还对采用这种柔性叶片的垂直轴风力机的非定常外载荷和能量效率进行了分析。计算结果表明，弯扭挠度峰值与涡轮机叶尖速比λ成正相关关系。对于柔性叶片，还观察到沿叶片沿着不均匀分布的结构应力，在支柱位置附近具有高应力状态。由于垂直轴风力机的旋转运动，作用在垂直轴风力机叶片上的离心力对叶片的结构特性起着重要的作用。叶片刚度的降低导致叶片应力的增加。将支柱位置从中间更改为尖端将导致大面积处于高应力下。结果还表明，VAWT与一个高度灵活的叶片是不是一个有效的能量提取装置相比，一个较小的灵活性或刚性叶片。
In this study, a three-dimensional VAWT with a spanwise passively deformable flexible blade has been modelled. The study mainly focuses on the analysis of blade structure characteristics associated with the bending and twist deflection. Two types of flexible blade material and two strut locations supporting H-type blades are being investigated. The unsteady external loads and energy efficiency of VAWT with such designed flexible blade are also being analysed. The simulation results show that the bending and twist deflection peak is positively correlated with the turbine tip speed ratioλ. For a flexible blade, an unevenly distributed structural stress along the blade with a high stress regime in the vicinity of strut location has also been observed. Due to the rotational motion of a VAWT, the centrifugal force acting on VAWT blade plays an important role on the blade structure characteristics. Reduction of the blade stiffness results in an increase of the blade stress. Changing the strut location from middle to tip will cause a large area under high stress. The results also indicate that the VAWT with a highly flexible blade is not an efficient energy extraction device when it is compared to a less flexible or a rigid blade.