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 浙江大学学报(工学版)  2018, Vol. 52 Issue (7): 1370-1375  DOI:10.3785/j.issn.1008-973X.2018.07.018 0

### 引用本文 [复制中英文]

dx.doi.org/10.3785/j.issn.1008-973X.2018.07.018
[复制中文]
LI Xiao-chao, XU Wei, ZHOU Xi-lin, ZHAO Li-ping. Experimental study on hydrodynamic and power characteristics of vortex-induced vibration based power generator[J]. Journal of Zhejiang University(Engineering Science), 2018, 52(7): 1370-1375.
dx.doi.org/10.3785/j.issn.1008-973X.2018.07.018
[复制英文]

### 文章历史

1. 长沙理工大学 水沙科学与水灾害防治湖南省重点实验室, 湖南 长沙 410004;
2. 长沙理工大学 可再生能源电力技术湖南省重点实验室, 湖南 长沙 410004

Experimental study on hydrodynamic and power characteristics of vortex-induced vibration based power generator
LI Xiao-chao1,2 , XU Wei1 , ZHOU Xi-lin1 , ZHAO Li-ping1
1. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha University of Science and Technology, Changsha 410004, China;
2. Key Laboratory of Renewable Energy Electric-Technology of Hunan Province, Changsha University of Science and Technology, Changsha 410004, China
Abstract: The lift force, vibration displacement and the output voltage of the generator at different flow velocities for different load resistances were measured. The lift coefficient, the response amplitude and frequency, the harnessed power and energy conversion efficiency with the change of current velocity were obtained and analyzed. The analysis reveals that the load resistance has weakly effect on the response amplitude and frequency, but significant effect on the output voltage of the generator, harnessed electrical power and energy conversion efficiency, and the effect is non-monotonic; the effect of the load resistance on the lift coefficient is very weak when it increases to a certain value. The characteristic of the lift changes with the reduced velocity. With the reduced velocity less than 5.0, the power spectrum of the lift coefficient shows a single frequency component, and the positive and the negative amplitudes are symmetrical; as the reduced velocity increases above 5.0, a double-frequency component appears in the spectra, and the positive amplitudes are significantly higher than the negative ones.
Key words: vortex-induced vibration (VIV)    energy conversion    lift force    vibration response

1 实验装置

 图 1 置于水槽上的涡激振动发电装置 Fig. 1 VIV-based power generator apparatus mounted on channel

 $m\ddot y + c\dot y + ky = F.$ (1)

 $F\left( t \right) = \rho {u^2}DL{C_y}\left( t \right)/2,$ (2)

 ${C_y}\left( t \right) = 2F\left( t \right)/(\rho {u^2}DL).$ (3)

 ${P_{\rm{o}}} = UI = {U^2}/{R_{\rm{L}}}.$ (4)

 ${P_{\rm{w}}} = \rho {u^3}DL/2.$ (5)

 $\eta = {P_{\rm{o}}}/{P_{\rm{w}}}.$ (6)

 $m = k\left( {4{{\rm{ \mathsf{ π} }}^2}f_0^2} \right),$ (7)

2 响应分析

 ${u_{\rm{r}}} = u/({f_{\rm{n}}}D).$
 图 2 R=29.8 Ω, ur=5.68时振动位移响应、发电机输出电压和输出功率时程曲线 Fig. 2 Time history curves of vibration displacement, output voltage and output power under R=29.8 Ω and ur=5.68

 图 3 振幅比、频率比、最大输出电压和最大输出功率随约化速度的变化 Fig. 3 Amplitude ratio, frequency ratio, maximum output voltage and maximum output power versus reduced velocity
 图 4 转换效率与约化速度的关系 Fig. 4 Conversion efficiency versus reduced velocity
3 升力系数

 图 5 升力系数时程曲线和频谱 Fig. 5 Time history and power spectral density (PSD) of lift coefficient

 图 6 升力系数幅值和均方根随约化速度的变化 Fig. 6 Variation of displacement amplitudes and RMS with reduced velocity
4 结论

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