集成于海上风电钢管桩基础上的升降式网箱结构波浪场特性研究  

Study on wave field characteristics of lifting-type net cage structure integrated with offshore wind power steel pipe pile foundation

作　　者：田正林 毛鸿飞 吴光林[1] 赫岩莉 林金波 TIAN Zhenglin;MAO Hongfei;WU Guanglin;HE Yanli;LIN Jinbo(College of Ocean Engineering and Energy,Guangdong Ocean University,Zhanjiang 524088,China)

机构地区：[1]广东海洋大学海洋工程与能源学院,广东湛江524088

出　　处：《海洋工程》2023年第6期76-86,共11页The Ocean Engineering

基　　金：2021年湛江市海洋青年人才创新项目(2021E05006,2021E05009,2021E05010);国家自然科学基金委员会青年项目(52001071);广东海洋大学科研启动费资助项目(060302072003,R20068);湛江市非资助科技攻关计划项目(2021B01033,2021B01416);广东省科技专项资金(“大专项+任务清单”)竞争性分配项目(2021A05227);广东省教育厅高校青年创新人才项目(2019KQNCX045)。

摘　　要：对安装在海上风电钢管桩基础上的升降式网箱结构的波浪场特性进行研究,掌握升降式网箱结构内部及结构后方水体的运动特征及速度场变化情况。基于OpenFOAM软件包开发了波、流与孔隙介质结构相互作用的数值计算模型,将网箱结构按等效阻力简化为多孔介质结构,开展升降式网箱结构的波浪场特性研究。研究结果表明:网箱结构对流体具有一定的阻流作用,网箱结构内部速度场得到一定程度的减小,网箱结构背浪侧也有一定的速度衰减区域;对比网箱结构顶部不同潜深条件下的网箱结构内部流场特征,网箱结构顶部潜深在1/4D~1/2D(D为水深)范围内网箱结构内部流场速度最小、流场最为稳定、速度分布均匀,网箱结构向浪侧前方和背浪侧后方流场波动较小。所得结论表明在钢管桩基础上安装升降式网箱结构时需要关注的网箱结构对流场特性的影响,充分考虑网箱结构阻力对流速的作用,掌握极端工况下升降式网箱结构保持优良养殖环境需要下潜的高度范围,以保障升降式网箱的安全。To study the wave field characteristics of the lifting cage structure installed on the steel pipe piles,to master the motion characteristics and the velocity field changes of the water body inside and outside the lifting cage structure,based on the OpenFOAM software package,a study model of the interaction between wave-current and pore medium structure,in which the cage is simplified into porous medium structure according to the equivalent resistance,was developed numerically,and the wave field characteristics of the lifting cage structure were studied systematically.The findings show that the cage structure has a certain choke-flow effect on the flow,the velocity field inside the net cage structure is reduced to a certain extent,and there is a certain flow-reduction region in flow velocity downstream from the net cage structure.Compared with the characteristics of the flow field inside the cage structure under different submerged depths at the top of the cage structure,the velocity of the flow field inside the cage structure is the smallest,the most stable,and the velocity distribution is also uniform when the submerged depth of the net cage structure is in the range of 1/4D~1/2D(D is the water depth).The flow field fluctuation in flow upstream and downstream of the net cage structure is small.Therefore,attention should be paid to the influence of the cage structure on the flow field characteristics when installing the lifting cage structure on the steel pipe piles,and the influence of the cage structure resistance on flow velocity should be considered fully.Further more,the submerged depth of the lifting cage structure under extreme working conditions should be mastered to maintain a good breeding environment so as to ensure the safety of the lifting cage.

关 键 词：海上风电基础 升降式网箱 下潜深度 速度场特性 

分 类 号：P751[交通运输工程—港口、海岸及近海工程] TV139.2[天文地球—海洋科学]