A study of characteristics and effects of scour-proof tidal current energy turbine wake flow under bed interference

PDF(1699 KB)

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (24) : 77-83.

SU Chunhao1，ZHAO Zhenzhou1，LIU Yan2，LIU Yige2，ALI Kashif2，LIU Huiwen1，WEI Shangshang1

Author information +

History +

Abstract

This paper proposes a method to mitigate the local scour protection of offshore wind turbine pile foundations by adopting a tidal current energy turbine wake stream, and conducts a study on the mutual interference between the wake stream of a horizontal axis tidal current energy turbine and the seabed bed. Taking the horizontal-axis tidal current energy turbine as the research object, the effects of the turbine installation heights of 0.75D, 1D and 1.25D on the wake velocity loss, wake vortex structure, and its effect on the bed shear stress are analysed. The results show that: in the x/D<3 near wake zone, the distribution of wake velocity deficit is similar under the installation height, and the larger the installation height is, the smaller the accelerated flow velocity above the bed is; in the far wake zone, the wake velocity deficit increases with the installation height, and the larger the flow velocity is at the surface of the seabed, which destroys the symmetry of the wake zone; in the case of the installation height H=0.75D, the tip vortex is dissipated in the collision with the bed surface in the far wake zone, and the vortex structure Meandering occurs; the bed shear stress in the wake area shows a tendency of decreasing and then increasing, and the installation heights are less than 1 between x/D=6-9, and all of them reach the minimum at x/D=8. In order to mitigate the scouring of the wind power pile foundation, the installation height of the turbine, H=1D, and the spacing of installation is the most suitable for the downstream, x/D=6-9.

Key words

tidal current turbine / local scour / velocity loss of wake / shear stress;

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

SU Chunhao1, ZHAO Zhenzhou1, LIU Yan2, LIU Yige2, ALI Kashif2, LIU Huiwen1, WEI Shangshang1. A study of characteristics and effects of scour-proof tidal current energy turbine wake flow under bed interference[J]. Journal of Vibration and Shock, 2024, 43(24): 77-83

References

[1] Bhattacharya S. Challenges in design of foundations for offshore wind turbines[J]. Engineering & Technology Reference , 2014, 1(1): 922.

[2] 卢光坤, 陈旭光, 杜文博等. 考虑桩-土作用及冲刷影响的海上风电结构损伤检测研究 [J]. 振动与冲击, 2023, 42 (01): 105-114.

Lu Guangkun, Chen Xuguang, Du Wenbo et al. Damage detection of offshore wind power structures considering pile-soil interaction and scour [J]. Journal of Vibration and Shock, 2023, 42 (01): 105-114.

[3] 代浩. 冲刷作用下钢管桩动力特性研究[D]. 南京: 东南大学, 2017.

Dai Hao. Research on dynamic characteristics of steel pipe pile under scouring [D]. Nanjing: Southeast University, 2017.

[4] 梁发云, 王琛, 贾承岳等. 冲刷深度对简支桥模态参数影响的模型试验 [J]. 振动与冲击, 2016, 35 (14): 145-150.

Liang Fayun, Wang Chen, Jia Chengyue et al. Model test on the influence of scour depth on modal parameters of simply supported bridge [J]. Journal of Vibration and Shock, 2016, 35 (14): 145-150.

[5] 张博杰. 水流作用下海上风机桩式基础局部冲刷三维数值模拟研究[D]. 天津: 天津大学, 2012.

B.J. Zhang. Three-dimensional numerical simulation of local scouring of pile foundation for offshore wind turbine under water flow [D]. Tianjin: Tianjin University, 2012.

[6] Wei W, Malekjafarian A, Salauddin M. Scour Protection Measures for Offshore Wind Turbines: A Systematic Literature Review on Recent Developments[J]. Energies, 2024, 17(5): 1068.

[7] Matutano C, Negro V, López-Gutiérrez J S, et al. Design of scour protection systems in offshore wind farms[J]. Journal of Energy Resources Technology, 2015, 137(5): 051204.

[8] Fazeres-Ferradosa T, Taveira-Pinto F, Reis M T, et al. Physical modelling of dynamic scour protections: Analysis of the Damage Number[C]//Proceedings of the Institution of Civil Engineers-Maritime Engineering. Thomas Telford Ltd, 2018, 171(1): 11-24.

[9] OuYang H, Dai G, Gao L, et al. Local scour characteristics of monopile foundation and scour protection of cement-improved soil in marine environment-Laboratory and site investigation[J]. Ocean Engineering, 2022, 255: 111443.

[10] Tang Z, Melville B, Shamseldin A, et al. Experimental study of collar protection for local scour reduction around offshore wind turbine monopile foundations[J]. Coastal Engineering, 2023, 183: 104324.

[11] Li H, Qiu X, Yan S, et al. Numerical investigation on the influence of a spoiler structure for local scour protection[J]. Applied Ocean Research, 2023, 138: 103675.

[12] Li J, Lian J, Guo Y, et al. Numerical study on scour protection effect of monopile foundation based on disturbance structure[J]. Ocean Engineering, 2022, 248: 110856.

[13] 张亚超. 水平轴潮流能发电机尾流效应的实验研究[D]. 杭州: 浙江大学, 2014.

Zhang Yachao. Experimental study of wake effect of horizontal axis tidal current energy generator [D]. Hangzhou: Zhejiang University, 2014.

[14] Myers L E, Bahaj A S. Experimental analysis of the flow field around horizontal axis tidal turbines by use of scale mesh disk rotor simulators[J]. Ocean engineering, 2010, 37(2-3): 218-227.

[15] Zhang Y, Zhang J, Zheng Y, et al. Experimental analysis and evaluation of the numerical prediction of wake characteristics of tidal stream turbine[J]. Energies, 2017, 10(12): 2057.

[16] Aghsaee P, Markfort C D. Effects of flow depth variations on the wake recovery behind a horizontal-axis hydrokinetic in-stream turbine[J]. Renewable energy, 2018, 125: 620-629.

[17] Zhang Z, Zhang Y, Zhang J, et al. Experimental study of the wake homogeneity evolution behind a horizontal axis tidal stream turbine[J]. Applied Ocean Research, 2021, 111: 102644.

[18] Batten W M J, Bahaj A S, Molland A F, et al. The prediction of the hydrodynamic performance of marine current turbines[J]. Renewable energy, 2008, 33(5): 1085-1096.

[19] De Vaal J B, Hansen M O L, Moan T. Effect of wind turbine surge motion on rotor thrust and induced velocity[J]. Wind Energy, 2014, 17(1): 105-121.