RESEARCH ON INFLUENCE OF FLOW INCIDENCE ANGLE ON OFFSHORE WIND TURBINE MONOPILE FOUNDATIONS WITH SPOILER STRUCTURES

Li Hui; Qiu Xu; Yan Shu; Zhao Hao; Ma Wenguan

doi:10.19912/j.0254-0096.tynxb.2023-1930

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (3) : 635-642. DOI: 10.19912/j.0254-0096.tynxb.2023-1930

RESEARCH ON INFLUENCE OF FLOW INCIDENCE ANGLE ON OFFSHORE WIND TURBINE MONOPILE FOUNDATIONS WITH SPOILER STRUCTURES

Li Hui^1,2, Qiu Xu^1,2, Yan Shu^1,2, Zhao Hao^1,2, Ma Wenguan^1,2

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Abstract

Based on the research conducted on the influence of spoiler dimensions and quantities on scour protection effectiveness for offshore wind turbine monopile foundations, this study further investigates the impact of flow incidence angle on scour protection effectiveness. In practical engineering, the direction of seawater flow is highly variable. Therefore, this paper adopts numerical simulation methods to simulate different flow incidence angles by changing the installation angle of the spoiler. The study focuses on two spoiler structures: one with 8 ribs tested at 0° and 22.5° incidence angles, and another with 6 ribs tested at 0° and 30° incidence angles. The scour protection characteristics of these structures are analyzed. The study examines how the intensity and position of the horseshoe vortex change under different flow conditions, as well as the distribution of bed shear stress and variations in relative protected area. The research findings indicate that scour protection effectiveness generally decreases with increasing flow incidence angle. Additionally, as the length or height of the spoiler increases, the differences in protected area increase with increasing angle variations. Overall, a flow incidence angle of 0° provides better scour protection effectiveness.

Key words

offshore wind power / attack angle / cylinder flow / spoiler / horseshoe vortex / shear stress

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Li Hui, Qiu Xu, Yan Shu, Zhao Hao, Ma Wenguan. RESEARCH ON INFLUENCE OF FLOW INCIDENCE ANGLE ON OFFSHORE WIND TURBINE MONOPILE FOUNDATIONS WITH SPOILER STRUCTURES[J]. Acta Energiae Solaris Sinica. 2025, 46(3): 635-642 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1930

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