Study on the Influence of Counterweight on Widening the Energy Harvesting Range of Bladeless Wind Turbine

doi:10.3901/JME.2023.04.265

Abstract

Abstract: To improve the energy harvesting efficiency of bladeless wind turbine, the method to widen the energy harvesting range of bladeless wind turbine by mean of counterweight is proposed based on the principle of tuning the natural frequency of the energy-capturing column(ECC). The formula for calculating the natural frequency of the ECC with counterweight is derived. The simulation model for vortex-induced vibration analysis is established and verified, and the effects of weight ratio and moving distance of counterweight on wind speed locking internal and energy harvesting efficiency of the ECC are discussed. The results show that the calculated natural frequency after the application of the counterweight is close to and larger than the frequency corresponding to the maximum swing amplitude of the ECC. The energy capture power and wind speed locking interval of the energy capture column can be significantly improved when the counterweight block is moved compared with that when it is fixed, and the length of the wind speed lock interval increased by 16.3 times. With the increase of the proportion of counterweight, the wind speed locking interval of the maximum swing of the ECC increases, and the relation between the interval length and the proportion of the counterweight mass satisfies the quadratic function. This means that wind energy capture can be maximized by adjusting the position of the counterweight when the incoming wind speed changes.

Key words: bladeless wind turbine, counterweight method, wind speed locking interval, natural frequency, energy harvesting efficiency

CLC Number:

TK89

GONG Shuguang, WANG Xiang, XIE Guilan, LU Haishan, XU Fanye. Study on the Influence of Counterweight on Widening the Energy Harvesting Range of Bladeless Wind Turbine[J]. Journal of Mechanical Engineering, 2023, 59(4): 265-273.

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