为研究进径比（参数C/B，射流孔位置到养殖池壁的水平距离C与养殖池短边边长B之比）对单管入流模式下双通道方形圆弧角养殖池系统流场特性的影响，基于计算流体动力学仿真技术，应用Fluent前处理软件Gambit构建三维数值计算模型，采用RNG k-ε湍流模型模拟循环水养殖池内流场。物理模型试验证明，该数值模型能够准确模拟方形圆弧角养殖池系统内的流场，同时提出能量有效利用系数评价养殖池系统的能量有效利用率。结果表明：优化进径比可有效改善养殖池系统内平均流速（a=0.05，P<0.000 1）、提高能量有效利用率。研究表明，进径比参数C/B在0.02~0.04区间有利于双通道方形圆弧角养殖池系统获得最佳水动力条件，为工厂化循环水养殖进水管的布设位置提供理论依据。

In order to study the influence of the relative inflow distance (parameter C/B, C is the horizontal distance from inlet to sidewall, B is the width of the rectangular tank) on the flow field characteristics of the double-drain square arc angle aquaculture tank system under the pattern of single-inlet pipe, this paper, based on CFD simulation technology, applied Fluent pre-processing software Gambit to construct a three-dimensional numerical calculation model and RNG k-ε turbulence model to simulate the flow field in a recirculating aquaculture tank system. The physical model test shows that the numerical model could accurately simulate the flow field in the square arc angle aquaculture tank system, and the effective energy utilization coefficient is proposed to evaluate the effective energy utilization rate of the aquaculture tank system. The results indicate that the average velocity (a=0.05，P<0.0001) in the aquaculture tank system and the effective energy utilization rate could be effectively improved by adjusting the relative inflow distance. The findings indicated that when the parameter C/B is between 0.02 and 0.04, it is conducive to obtaining the optimal hydrodynamic conditions in the double-drain square arc angle aquaculture tank system, which provides a theoretical basis for the layout of the industrial recirculating aquaculture inlet pipe.