Energy Conversion Efficiency of Wavy Conical Wind Energy Capture Structure

doi:10.16183/j.cnki.jsjtu.2022.137

Abstract

Abstract:

In order to improve the energy harvesting efficiency of the wind energy capture structure, this paper proposes a novel wavy conical bladeless wind energy capture structure, and establishes a mathematical model for energy conversion of the wavy conical wind energy capture structure. The Reynolds-averaged N-S equations in combination with the SST k-ω turbulence model is used to numerically simulate the vortex-induced vibration response of the energy capture structure, and analyze the effects of mass ratio and damping ratio on the vortex-induced vibration response and wind energy conversion efficiency of the wavy conical wind energy capture structure. The results show that the wavy conical energy capture structure with a mass ratio of m^*=2 and a damping ratio of ζ=0.05 can obtain a wider lock-in interval and higher energy conversion efficiency. It is also found that the mass damping ratio m^*ζ directly affects the energy conversion efficiency, a suitable combination of m^*ζ can improve the energy conversion efficiency, with an average energy conversion efficiency of nearly 31% higher at m^*ζ=0.10 than at m^*ζ=0.05. The research results can provide theoretical support for the improvement of the energy conversion efficiency of bladeless wind turbines.

Key words: energy conversion, vortex-induced vibration, mass ratio, damping ratio, wavy conical structure

CLC Number:

TK89

ZOU Lin, YAN Yulong, TAO Fan, LIU Diwei, ZHENG Yunlong. Energy Conversion Efficiency of Wavy Conical Wind Energy Capture Structure[J]. Journal of Shanghai Jiao Tong University, 2023, 57(8): 1067-1077.

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Case	N	Δt	C_d,m	C_l,r	A_max/mm
1	904 337	0.001	1.223 5	0.618 9	5.88
2	1 380 278	0.001	1.245 4	0.636 0	6.09
3	1 499 493	0.001	1.242 5	0.638 8	6.08
4	1 380 278	0.000 5	1.304 7	0.692 5	6.52
5	1 380 278	0.000 25	1.297 0	0.689 4	6.51
文献[17]	—	—	—	—	6.50

方案	Re	m^*	ζ
1	3 900	2	0.10
2	3 900	2	0.05
3	3 900	3	0.05
4	3 900	4	0.05
5	3 900	5	0.01
6	3 900	5	0.02
7	3 900	5	0.03
8	3 900	5	0.04
9	3 900	10	0.01