The Effect of Corner Structure on the Optimisation of Fishable Flow Field in Aquaculture Tanks

Fan Zhang, Mingchao Cui, Huang Liu, Chen Zhang
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Abstract

As coastal waters face constraints such as the deterioration of the aquaculture environment and limitations on the scale of operation, aquaculture will move towards the deep and distant sea. Large-scale aquaculture vessels are a new method of deep-sea aquaculture, and improving the utilisation efficiency of aquaculture tanks to ensure the best growth conditions for fish inside while ensuring the efficient discharge of particulate matter in these tanks will affect the productivity of aquaculture and the profitability of aquaculture vessels. This study investigated the effects of the tank structure ratio on the flow field characteristics and particulate removal efficiency in the aquaculture tanks of an aquaculture vessel. Numerical simulations of the flow field characteristics in the aquaculture tanks of an 8000 t-class aquaculture vessel at anchor were conducted using the FLOW-3D software to quantitatively evaluate the effects of the corner ratio on the fishability of aquaculture tanks and the efficiency of particulate emission using the parameters related to flow velocity, turbulence intensity, capacity utilisation rate, and particulate removal efficiency. The simulation results show that the tanks with corner structures have better flow field characteristics, which include a higher flow velocity, turbulence intensity, and discharge effect. When the corner length is more than 1/3 of the tank length, increasing the corner distance does not significantly enhance the optimisation of the flow field characteristics in the tank. Overall, this study’s results provide a reference basis for the structural design and optimisation of aquaculture tanks in aquaculture vessels.
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转角结构对优化水产养殖水槽中可捕捞流场的影响
由于近海面临养殖环境恶化和经营规模限制等制约因素,水产养殖将向深海和远海发展。大型水产养殖船是一种新的深海养殖方式,提高养殖水槽的利用效率,确保水槽内鱼类的最佳生长条件,同时保证水槽内颗粒物的有效排放,将影响水产养殖的生产率和养殖船的盈利能力。本研究探讨了水槽结构比对水产养殖船养殖水槽流场特性和颗粒物去除效率的影响。使用 FLOW-3D 软件对一艘 8000 吨级水产养殖船锚地养殖水槽的流场特性进行了数值模拟,利用流速、湍流强度、容量利用率和颗粒物去除效率等相关参数,定量评估了转角比对水产养殖水槽可捕性及颗粒物排放效率的影响。模拟结果表明,带转角结构的水槽具有更好的流场特性,包括更高的流速、湍流强度和排放效果。当转角长度超过储罐长度的 1/3 时,增加转角距离并不能显著提高储罐流场特性的优化效果。总之,该研究结果为水产养殖船中养殖水槽的结构设计和优化提供了参考依据。
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