Hydrodynamic Performance of a Barge-Type Floating Offshore Wind Turbine with Moonpool

doi:10.16183/j.cnki.jsjtu.2022.521

Abstract

Abstract:

The hydrodynamic performance of a barge-type floating offshore wind turbine (FOWT) with a moonpool is studied in frequency domain with reference to the Ideol-Floatgen design. The correction of the viscous damping of the moonpool is considered. First, the resonance modes of the moonpool are analyzed. Then, the hydrodynamic coefficients of the FOWT under regular waves and the motion responses under irregular waves are investigated. Finally, the safety of the FOWT is verified with respect to the DNV standards. The results show that the dynamic pitch and nacelle acceleration of the barge-type FOWT meet the safety requirements under both operating and survival conditions. The investigation of the coupling effects of the platform motion and the moonpool resonance shows that the motion of the platform will cause the shift of the piston mode frequency of the moonpool and the reduction of the piston mode response amplitude, the frequency of the sloshing mode is basically unaffected, but the response amplitude of the first-order sloshing mode is increased. The motion responses of the barge-type FOWT with and without the moonpool are compared. It is found that the moonpool can reduce the motion response of the FOWT, and improve the overall hydrodynamic performance of the FOWT. The platform length, moonpool length and platform draught are parametrically analyzed. Surge, heave, pitch response RMS values and the nacelle acceleration response RMS value are used as the indicators of comparison. It is found that the increase of the platform length could effectively reduce the four response RMS values of the FOWT under both operating and survival conditions, the increase of the moonpool length will reduce the four response RMS values of the FOWT under the operating condition, and the increase of the platform draught could significantly reduce the four response RMS values of the FOWT under the survival condition, the heave and pitch response RMS values increase with the augmentation of the draught under the operating condition.

Key words: barge-type floating offshore wind turbine (FOWT), dynamic response, moonpool, resonance mode

CLC Number:

P751

CHEN Yiren, YAO Jinyu, LI Mingxuan, ZHANG Xinshu. Hydrodynamic Performance of a Barge-Type Floating Offshore Wind Turbine with Moonpool[J]. Journal of Shanghai Jiao Tong University, 2024, 58(7): 965-982.

Figures/Tables 29

Fig.1

Tab.1

Tab.2

Tab.3

Tab.4

Tab.5

Fig.2

Tab.6

Tab.7

Fig.3

Fig.4

Tab.8

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Tab.9

Fig.11

Tab.10

Tab.11

Fig.12

Fig.13

Tab.12

RMS values of pitch response and acceleration response of nacelle under LC2

参数	LC2 RMS值		下降比例/%
参数	有月池	无月池	下降比例/%
σ(X₅)/(°)	6.65	5.31	18.56
σ( $ζ ¨$ )/(m·s^-2)	2.25	1.98	12.00

Tab.12

Fig.14

Fig.15

Fig.16

Fig.17

References 23

[1]	周昊, 侯承宇, 李辉, 等. 我国海域漂浮式风电机组基础适用性分析[J]. 风能, 2020(7): 102-105.
	ZHOU Hao, HOU Chengyu, LI Hui, et al. Applicability analysis of floating wind turbine foundation in China’s sea areas[J]. Wind Energy, 2020(7): 102-105.
[2]	国家发改委能源研究所. 中国2030年风电发展展望[R]. 北京: 国家发改委能源研究所, 2010.
	National Development and Reform Commission Energy Research Institute. China’s wind power development outlook 2030[R]. Beijing: National Development and Reform Commission Energy Research Institute, 2010.
[3]	JONKMAN J M. Dynamics modeling and loads analysis of an offshore floating wind turbine[R]. USA: Dissertations & Theses-Gradworks, 2007.
[4]	BROWNING J R, JONKMAN J, ROBERTSON A, et al. Calibration and validation of a spar-type floating offshore wind turbine model using the FAST dynamic simulation tool[J]. Journal of Physics: Conference Series, 2014, 555: 012015.
[5]	LEE S. Dynamic response analysis of spar buoy floating wind turbine systems[D]. USA: Massachusetts Institute of Technology, 2008.
[6]	TRACY C. Parametric design of floating wind turbines[D]. USA: Massachusetts Institute of Technology, 2007.
[7]	KVITTEM M I, BACHYNSKI E E, MOAN T. Effects of hydrodynamic modelling in fully coupled simulations of a semi-submersible wind turbine[J]. Energy Procedia, 2012, 24: 351-362.
[8]	张洪建, 蔡新, 许波峰. 浮式风机半潜式平台动力响应研究[J]. 可再生能源, 2021, 39(9): 1210-1216.
	ZHANG Hongjian, CAI Xin, XU Bofeng. Study on dynamic response of floating wind turbine semi-submersible platform[J]. Renewable Energy Resources, 2021, 39(9): 1210-1216.
[9]	刘一鸣, 王博, 刘青松, 等. 风浪异向下超大型漂浮式风力机动态响应研究[J]. 机械强度, 2022, 44(2): 383-393. doi: 10.16579/j.issn.1001.9669.2022.02.018
	LIU Yiming, WANG Bo, LIU Qingsong, et al. Research on dynamic response of super large floating wind turbine under wind-wave misalignment[J]. Journal of Mechanical Strength, 2022, 44(2): 383-393. doi: 10.16579/j.issn.1001.9669.2022.02.018
[10]	魏东泽, 阙小玲, 付图南, 等. 新型半潜式海上风力机基础水动力特性研究[J]. 海洋工程, 2022, 40(1): 82-92.
	WEI Dongze, QUE Xiaoling, FU Tunan, et al. Research on hydrodynamic characteristics of a new semi-submersible floating foundation for offshore wind turbine[J]. The Ocean Engineering, 2022, 40(1): 82-92.
[11]	徐添, 张庆年, 田依农, 等. 15MW级大型漂浮式风力机运动特性[J]. 船舶工程, 2022(2): 044.
	XU Tian, ZHANG Qingnian, TIAN Yinong, et al. Motion characteristics of 15 MW large floating wind turbine[J]. Ship Engineering, 2022(2): 044.
[12]	BEYER F, CHOISNET T, KRETSCHMER M, et al. Coupled MBS-CFD simulation of the IDEOL floating offshore wind turbine foundation compared to wave tank model test data[C]//International Ocean and Polar Engineering Conference. Hawaii, USA: International Society of Offshore and Polar Engineers, 2015.
[13]	BORISADE F, CHOISNET T, CHENG P W. Design study and full scale MBS-CFD simulation of the IDEOL floating offshore wind turbine foundation[J]. Journal of Physics: Conference Series, 2016, 753: 092002.
[14]	IKOMA T, NAKAMURA M, MORITSU S, et al. Effects of four moon pools on a floating system installed with Twin-VAWTs[C]ASME 2019 2nd International Offshore Wind Technical Conference. St. Julian’s, Malta: American Society of Mechanical Engineers, 2019.
[15]	TAN L, IKOMA T, AIDA Y, et al. Mean wave drift forces on a barge-type floating wind turbine platform with moonpools[J]. Journal of Marine Science and Engineering, 2021, 9(7): 709.
[16]	易乾. 南海海域风浪条件下浮式风机动力响应及构型参数研究[D]. 北京: 清华大学, 2017.
	YI Qian. Research on dynamics response and structural properties of floating wind turbines under wind-wave condition in South China Sea[D]. Beijing: Tsinghua University, 2017.
[17]	YANG R Y, WANG C W, HUANG C C, et al. The 1∶20 scaled hydraulic model test and field experiment of barge-type floating offshore wind turbine system[J]. Ocean Engineering, 2022, 247: 110486.
[18]	CHUANG T C, YANG W H, YANG R Y. Experimental and numerical study of a barge-type FOWT platform under wind and wave load[J]. Ocean Engineering, 2021, 230: 109015.
[19]	DNVGL. Loads and site conditions for wind turbine: DNVGL-ST-0437[S]. Norway: DNVGL, 2016.
[20]	XU X, ZHANG X, CHU B, et al. On Natural frequencies of three-dimensional moonpool of vessels in the fixed and free-floating conditions[J]. Ocean Engineering, 2020, 195: 106656.
[21]	JONKMAN J. Definition of the floating system for phase IV of OC3[R]. Golden, USA: NREL, 2010.
[22]	DNVGL. Coupled analysis of floating wind turbines: DNVGL-RP-0286[S]. Norway: DNVGL, 2019.
[23]	TRACY C C H. Parametric design of floating wind turbines[D]. Cambridge, USA: Massachusetts Institute of Technology, 2007.

参数	取值	参数	取值
单机功率/MW	5	机舱质量/kg	240 000
叶轮直径/m	126	叶片质量/kg	17 740
桨毂中心高度/m	90	桨毂质量/kg	56 780
重心高度/m	64	风力机总质量/kg	314 520

参数	取值	参数	取值
塔筒高度/m	85	塔筒密度/(kg·m^-3)	8 500
塔筒重心高度/m	35.9	I_xx,I_yy/(kg·m²)	1.52×10⁸
塔筒总质量/kg	266 557	I_zz/(kg·m²)	1.86×10⁶

参数	取值	参数	取值
L₁/m	60	D/m	10
L₂/m	20	I_xx,I_yy/(kg·m²)	9.66×10⁹
L_z/m	-4.86	I_zz/(kg·m²)	1.93×10¹⁰
H/m	15	M_z/kg	32 200 282

参数	取值	参数	取值
L₁/m	60	D/m	10
L₂/m	20	I_xx,I_yy/(kg·m²)	1.31×10¹⁰
L_z/m	-3.61	I_zz/(kg·m²)	1.93×10¹⁰
H/m	15	M_z/kg	32 781 359

参数	取值	参数	取值
L₁/m	60	D/m	10
L₂/m	20	I_xx,I_yy/(kg·m²)	1.33×10¹⁰
L_z/m	-3.60	I_zz/(kg·m²)	1.96×10¹⁰
H/m	15	M_z/kg	36 806 394