床面干涉下防冲刷潮流能水轮机尾流特性及影响研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (24) : 77-83.

论文

床面干涉下防冲刷潮流能水轮机尾流特性及影响研究

苏纯浩1，赵振宙1，刘岩2，刘一格2，Ali Kashif2，刘惠文1，魏赏赏1

作者信息 +

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

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

Author information +

文章历史 +

摘要

本文提出采用潮流能水轮机尾流来减轻海上风电机组桩基局部冲刷防护的方法，针对水平轴潮流能水轮机的尾流与海床床面的相互干涉作用展开研究。以水平轴潮流能水轮机为研究对象，分析水轮机安装高度0.75D、1D和1.25D，对尾流速度亏损、尾涡结构，及其对床面剪切应力的影响。研究结果表明：在x/D<3近尾流区，安装高度下尾流速度亏损分布相似，安装高度越大，床面上方加速流速度越小；在远尾流区，尾流速度亏损随安装高度增大而增大，海床表面流速越大，破坏了尾流区的对称性；安装高度H=0.75D时，其梢涡在远尾流区与床面碰撞发生耗散，涡结构发生蜿蜒；床面剪切应力在尾流区呈先减小后增大的趋势，各安装高度下在x/D=6-9之间均小于1，且都在x/D=8达到最小，为减轻风电桩基冲刷，水轮机安装高度H=1D、安装间距为下游x/D=6-9最为合适。

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.

导出引用

苏纯浩1, 赵振宙1, 刘岩2, 刘一格2, Ali Kashif2, 刘惠文1, 魏赏赏1. 床面干涉下防冲刷潮流能水轮机尾流特性及影响研究[J]. 振动与冲击, 2024, 43(24): 77-83

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

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