In this paper, a modification of the mast, which is the main part of a vortex-induced wind generator was considered in order to improve the performance. Numerical simulations were applied to investigate the change in vortex shedding frequency behind an oscillating structure. Considering the identical vortex shedding frequencies throughout the whole mast, an expression for the characteristic length (ϕ) was defined. The numerical simulations were conducted for an oscillating cylinder at different wind speeds and for different A/D to present a formula for designing of the mast. The FFT was implemented to determine the frequencies. The results showed that for A/D > 0.2, the variations in characteristic length were not significant. It was found that for Re < 2 × 10⁴, the variation in \(\phi /D\) was considerable and was taken into account in the design of the mast. Using these results, an expression for calculation of the diameter of the mast at different heights was generated. Finally, a small mast with a height of 3 m was designed based on this method. For evaluation of the modified mast, a 3D simulation was conducted. Results showed that the vortex shedding frequencies were the same throughout the whole mast, which is desired.

本文考虑对涡流风力发电机的主要部件桅杆进行改造，以提高其性能。应用数值模拟来研究振荡结构后面涡旋脱落频率的变化。考虑到整个桅杆的涡旋脱落频率相同，定义了特征长度 ( )的表达式。对不同风速和不同A / D下的摆动圆柱体进行数值模拟，给出了桅杆的设计公式。实施 FFT 以确定频率。结果表明，当A / D  >0.2时，特征长度的变化并不显着。结果发现，对于 Re < 2 × 10 ^{4 ，} \(\phi /D\)的变化相当大，并且在桅杆设计中考虑到了这一变化。利用这些结果，生成了计算不同高度桅杆直径的表达式。最终基于该方法设计了高度为3 m的小型桅杆。为了评估修改后的桅杆，进行了 3D 模拟。结果表明，整个桅杆的涡流脱落频率是相同的，这是所期望的。