网格锚定单体碟形网箱的水动力特性研究

Hydrodynamic characteristics of single grid mooring ocean spar sea station

目前碟形网箱在我国并未得到广泛的推广应用,但其良好的抗流抗变形能力和可沉降特点使其在大风大浪水流湍急的深海水域有着不可替代的作用。如能在深水碟形网箱的基础上,开发出具有自主知识产权的深水网箱,必将对我国的养殖业产生重大的影响。本文基于凝集参数法,利用Orca Flex软件建立网格锚定的深水碟形网箱模型,并进行了多海况下的数值计算。结果表明,波流联合作用下,对锚绳张力影响最大的为海流流速,其次为波高,周期对张力的影响并不明显;锚绳最大张力并非出现在入射波与流速同向的情况下,而是发生在两者存在某一夹角时;浮环最大倾角随流速和波高线性增大,随着波浪周期增大而减小;此外,下沉能明显改善网箱系统和锚绳的受力。

The ocean spar sea station has not been widely applied in our country, however, its excellent deformation resistance ability and characteristics of subsidence make it have an irreplaceable role in deep water aquaculture. If we can develop a type of deep sea cage with independent intellectual property rights on the basis of the sea station, it will have a significant impact on our country′s aquaculture. In this paper, a single grid mooring sea station cage numerical model was built based on the lumped-parameter method and its characteristics were analyzed by calculating with OrcaFlex under different sea conditions. Results show that under the combined wave-current action, the forces on mooring lines are strongly influenced by current velocity, followed by wave height and are hardly influenced by the period of waves. The maximum tension of the mooring lines occurs when the wave and current have a certain angle, rather than under parallel wave-current conditions. The maximum inclination of the rim in-creases linearly as the flow velocity and wave height increase, and decreases as the period of the waves increases. In addition, the forces on cage and mooring lines may decrease obviously when the cage is submerged.