Effects of length-diameter ratio of mast on vortex-induced lateral swing characteristics of finite length cone-shaped energy capture column

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 261-267.

GONG Shuguang, XU Fanye, XIE Guilan, LU Haishan

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Abstract

The bladeless wind turbine is a kind of device that collects wind energy by the wind-induced lateral swing of the energy capture column and converts it into electric energy. An energy capture system was constructed by introducing the mast structure and combining it with the finite length conical platform energy capture column in this paper. Based on the establishment of a simplified model of the finite length cone-platform energy capture system, the calculation formula of the dimensionless structure coefficient related to the geometry of the energy capture column was derived. The effect of length to diameter ratio of mast on vortex-induced swing characteristics and energy capture efficiency of the finite length cone-platform energy capture column was discussed. The results show that the introduction of the mast structure can be effectively improved the peak amplitude of vortex-induced swing and energy harvesting efficiency of the finite length energy capture column, and both of them increase first and then decrease with the increase of the length to diameter ratio of the mast. Compared with the structure with infinite length capture column, the energy collection efficiency of the finite length capture column is increased by 44.8% when the length to diameter ratio of the mast is 6.67. Increasing the length to diameter ratio of the mast will widen the frequency locking interval, but the natural frequency of the capture system will decrease. For a given capture system, there exists an optimal length to diameter ratio of the mast. The results are of great significance to the design and practical engineering application of the bladeless wind turbine.

Key words

bladeless wind turbine / vortex-induced swing / cone-platform energy harvesting column / mast / finite length / slenderness ratio

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GONG Shuguang, XU Fanye, XIE Guilan, LU Haishan. Effects of length-diameter ratio of mast on vortex-induced lateral swing characteristics of finite length cone-shaped energy capture column[J]. Journal of Vibration and Shock, 2023, 42(9): 261-267

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