To improve the utilization of energy input from inlet pipe jets and the efficiency of waste collection in a recirculating aquaculture system (RAS), the hydrodynamics and self-purification efficiency of square fillet aquaculture tanks were studied under different numbers of inlet pipes and particle physical properties. First, a numerical model was established by reference to the experimental model, and the validity of the numerical method was verified by comparing the experimental results. Then, the hydrodynamics of the aquaculture tanks were analyzed, including velocity distribution, vorticity strength, energy utilization efficiency, flow uniformity index and self-purification efficiency. Finally, the discharge rates of particles at overflow and underflow with different densities and diameters were also analyzed. The results reflect that the swirling velocity, flow uniformity index, energy utilization efficiency, turbulence and secondary flow intensity increase under steady injection, which is conducive to improving the self-purification efficiency in the RAS. In the case of a single inlet pipe and a particle density of 1300 kg/m³, the discharge rate is the highest, and the residence time is relatively short. The smaller the particle size is, the longer the residence time and the lower the discharge rate. The larger the particle size is, the faster the removal rate increases, and the effect is not obvious for particles larger than 2.0 mm in diameter. The inclusive analysis not only explores the hydrodynamics in aquaculture tanks with different water injection structures but also recommends RAS structural optimization design.

【摘要】：为提高循环水养殖系统(RAS)进水管射流输入能量的利用率和垃圾收集效率,研究了不同进水管数和颗粒物理特性下方形鱼片养殖池的流体力学和自净效率。 . 首先，参照实验模型建立了数值模型，通过实验结果对比验证了数值方法的有效性。然后，分析了养殖池的流体动力学，包括速度分布、涡度强度、能量利用效率、流动均匀性指数和自净效率。最后，还分析了不同密度和直径的颗粒在溢流和底流处的排放率。结果反映稳态喷射下旋流速度、流动均匀性指数、能量利用效率、湍流度和二次流强度增加，有利于提高RAS内的自净效率。在单个入口管和颗粒密度为 1300 kg/m 的情况下³、放电率最高，停留时间较短。粒径越小，停留时间越长，出料率越低。粒径越大，去除率增加越快，对于直径大于2.0mm的颗粒效果不明显。包容性分析不仅探讨了具有不同注水结构的水产养殖池的流体动力学，还推荐了 RAS 结构优化设计。