Coupled Dynamic Response on a 6 MW Spar-Type Floating Offshore Wind Turbine Under Extreme Conditions

doi:10.16183/j.cnki.jsjtu.2019.140

Abstract

Abstract:

To realize the practical scale application of the spar-type floating offshore wind turbine (FOWT) in the medium depth sea areas, a novel 6 MW spar-type floating offshore wind turbine is analyzed by model test and numerical simulation under extreme conditions. The response of main freedom degrees, the mooring tense and the stress at the danger point are explored by a 1∶65.3 scale model at the State Key Laboratory of Ocean Engineering in Shanghai JiaoTong University. Coupled motion response of the spar-type floating wind turbine is calculated by using numerical simulation software in time domain. The results of the numerical simulation and model test are compared and analyzed in time and frequency domain. The maximum deviation between numerical simulation and model test is less than 12%, which shows that the numerical simulation results are in good agreement with the model test results. The dynamic response energy of the FOWT is mainly concentrated at low frequency and wave frequency. Moreover, the whole FOWT system has an excellent survivability under extreme conditions. Finally, the ultimate load of the wind turbine is predicted, which provides the necessary theoretical basis and calculation parameters for the structural strength calculation.

Key words: floating offshore wind turbine, model test, numerical simulation, coupled dynamic response, prediction of ultimate load

CLC Number:

P751
TM614

YANG Jie, HE Yanping, MENG Long, ZHAO Yongsheng, WU Haoyu. Coupled Dynamic Response on a 6 MW Spar-Type Floating Offshore Wind Turbine Under Extreme Conditions[J]. Journal of Shanghai Jiao Tong University, 2021, 55(1): 21-31.

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系统	参数	数值
系统	参数	实型值	模型值
风轮	额定功率/MW	6	2.67×10^－6
	叶片长度/m	78	1.19
	轮毂半径/m	2.35	0.036
	轮毂中心高度/m	100	1.53
塔筒	塔筒高度/m	83.8	1.28
	塔筒顶部直径/m	4.8	0.07
	塔筒底部直径/m	8	0.12
Spar平台	设计水深/m	100	1.53
	设计吃水/m	76	1.16
	平台长度/m	89	1.36
	平台重心 (包括压载)/m	－62.3	－0.95
	平台浮心/m	－41.2	－0.63
	锚链总长/m	400	6.13
锚泊系统	初始躺底长度/m	212.9	3.26
	锚链轴向刚度/m	801 692.19	2.88
	锚链破坏力/kN	11 981	0.043

参数	实际值	模型值
平均风速/(m·s^－1)	49	0
表层流速/( m·s^－1)	2	0.247
浪流方向/(°)	0	0
有义波高/m	14.4	0.221
谱峰周期/s	13.3	1.646
波形谱参数	2.4	2.4

参数	比例因子	参数	比例因子
L_s/L_m	λ		λ^－1/2
V_s/V_m	λ^1/2	T_s/T_m	λ^1/2
a_s/a_m	1	f_s/f_m	λ^－1/2
?_s/?_m	1	F_s/F_m	γλ³
A_s/A_m	λ²	M_s/M_m	γλ⁴
▽_s/▽_m	λ³	E_s/E_m	λ
ρ_s/ρ_m	γ	T_s/T_m	λ⁴
Δ_s/Δ_m	γλ³	P_s/P_m	λ^7/2

自由度	固有周期/s
自由度	试验值	数值模拟值
纵荡	73.4	73.1
横荡	73.4	73.1
垂荡	25.9	25.1
横摇	42.9	42.4
纵摇	41.1	42.4
艏摇	11.8	11.1

方法	F/kN	F_T/kN	M/(kN·m)	M_Z/(kN·m)	P/(°)
模型试验	1 306	2 618	6 389	965	8.59
数值模拟	1 306	2 224	6 852	3 520	6.82
模型试验	1 296	2 645	6 638	3 538	8.52
数值模拟	1 267	2 462	6 115	－2 159	7.15
模型试验	146	－42	9 049	－1 584	－0.01
数值模拟	143	－50	8 623	－1 831	－0.01
模型试验	－323	－875	6 018	－5 644	－0.11
数值模拟	－388	－1 053	6 131	－5 357	－0.21
模型试验	1 028	2 092	6 341	－2 800	9.18
数值模拟	954	1 802	6 125	－3 047	7.62