床面干涉下防冲刷潮流能水轮机尾流特性及影响研究  

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

作　　者：苏纯浩 赵振宙[1] 刘岩[2] 刘一格 Ali Kashif 刘惠文[1] 魏赏赏 SU Chunhao;ZHAO Zhenzhou;LIU Yan;LIU Yige;ALI Kashif;LIU Huiwen;WEI Shangshang(College of Renewable Energy,Hohai University,Changzhou 213200,China;College of Electrical and Power Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学新能源学院,江苏常州213200 [2]河海大学电气与动力工程学院,南京211100

出　　处：《振动与冲击》2024年第24期77-83,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(52376179,12102125);2024年江苏省研究生科研与实践创新计划项目(SJCX24_0205);河海大学2023年优秀研究生学位论文培育项目。

摘　　要：该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、1.00D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,海床表面流速大,破坏了尾流区的对称性;当安装高度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=1.00D、安装间距为下游x/D=6~9最为合适。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,1.00D,and 1.25D on the wake velocity loss,wake vortex structure,and its effect on the bed shear stress are analyzed.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 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=1.00D,and the spacing of installation is the most suitable for the downstream,x/D=6-9.

关 键 词：潮流能水轮机 局部冲刷 尾流亏损 剪切应力 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]