为研究进水系统优化对方形圆弧角养殖池内流场特性的影响，实验运用计算流体动力学仿真技术 (CFD)构建方形圆弧角养殖池的三维数值湍流模型，单管进水系统设置在养殖池弧壁的中间位置 (以下称弧壁单管)，并主要对不同进径比(参数 C/B，射流管中心位置到养殖池壁的水平距离 C 与养殖池短边边长 B 之比)和不同射流角度对养殖池系统内的流场特性开展研究。结果显示，不同进径比条件下，随射流角度增加养殖池水体平均速度均呈现先增大后减小的趋势，且最优射流角度不同。进径比为0.01且射流角度为45°时，养殖池内部流场平均流速最高。进径比为0.03时，最优射流角度为30°。当C/B=0.05~0.13时且射流角度为25°时，水体平均速度最高且流场均匀性较好。进径比C/B=0.07~0.09、射流角度为25°时，养殖池内部流态总体上优于其他工况。研究表明，养殖池流场特性与进水系统进径比和射流角度密切相关。研究结果可为工厂化循环水养殖进水系统设计和优化养殖池系统的流场特性提供理论依据。
The aquaculture industry is now in a state of changing, from traditional to modern, from extensive to accuracy aquaculture, with Recirculating Aquaculture System as a creative and efficient aquaculture model. In order to investigate the effects of inlet system optimization on the internal flow field characteristics of aquaculture tanks, analyzes the hydrodynamic features of aquaculture tank applying different inlet structure layout, so as to provide a theoretical basis for the inlet structure design of Recirculating Aquaculture System.Under the application of Computational Fluid Dynamics simulation (CFD), a three-dimensional numerical turbulence model of the square arc angle aquaculture tank was constructed. The single tube inlet system was located in the middle of the arc wall of the aquaculture tank (hereinafter referred to as: arc wall single tube), and adjusted to various inlet-diameter ratios (parameter C/B, the ratio of the horizontal distance C from the center of the jet tube to the tank wall, to the length B on the shorter side of the tank) and different jet angles to study the flow field characteristics in the tank system. From the experiment it is found that the internal flow field features of single tube aquaculture tank are significantly affected by the inlet angle and diameter ratio of the inlet system, and the optimized jet angle of each inlet diameter ratio of square arc angle aquaculture tank differs with each other. The layout of the inflow system of the aquaculture tank involves the two parameters of inlet diameter ratio and jet angle in a comprehensive way, and make sure them are matching. According to the relative inflow distance data, the results show that with the increase of inlet diameter ratio, the optimal average velocity curve of water body first increases and then decreases. When the inlet diameter ratio is 0.09 and the jet angle is 25°, the velocity is the maximum. The optimal angular velocity of inlet diameter ratio 0.09 is about 28.13% higher than that of inlet diameter ratio 0.01. When the relative inflow distance reaches 0.07-0.11, the uniformity coefficient reaches the peak value when the jet angle is 25°. According to the comprehensive analysis of the internal flow velocity, flow field uniformity and internal characteristic diagram of the flow field in the aquaculture tank,under the condition that the inlet diameter ratio C/B=0.07-0.09 and the jet angle is 25°, the internal flow pattern of the aquaculture tank is generally better than other working conditions, the flow environment of the aquaculture tank achieves the best, and the correstanking flow conditions accommodate the needs of Recirculating Aquaculture System better, reducing energy consumption and building a steady flow system. This research will provide a basis for influent system of Recirculating Aquaculture System designing and the optimization of its flow field features.