进径比对矩形圆弧角养殖池水动力特性影响

为研究单管入流模式下,进径比(参数C/B,C为射流孔位置到养殖池壁的水平距离,B为养殖池短边边长)对单通道矩形圆弧角养殖池系统水动力特性的影响,实验运用计算流体动力学仿真技术构建单通道矩形圆弧角养殖池三维数值计算模型,应用平均流速、阻力系数和速度分布均匀系数等流体动力学特征量分析养殖池内(尤其是池底)的流场形态,并修正能量有效利用系数以评估养殖池系统的能量有效利用率。结果显示,将进径比参数C/B从0.00增大到0.05可有效改善养殖池内流场特性,进径比参数C/B设置在0.02～0.04之间有利于单通道矩形圆弧角养殖池系统获得最佳的流场条件。研究表明,进径比参数的较小优化可显著提高养殖池内平均流速与能量有效利用率,利于形成均匀稳定的流场。

A numerical study of the effect of relative inflow distance on hydrodynamic characteristics in the single-drain rectangular aquaculture tank with arc angles

In order to investigate the influence of the position of inlet pipe on the hydrodynamic characteristics in recirculating aquaculture tank, the fluid dynamics simulation technology was employed and a three-dimensional numerical model was established to simulate the flow field in single-rectangular arc angle aquaculture tank. The numerical model was verified and used to investigate the effects of the relative inflow distance C/B (C is the distance from inlet to sidewall, and B is the width of the tank) on hydrodynamic characteristics in the tank under the mode.The flow field was analyzed by using the hydrodynamic characteristics such as velocity and velocity distribution uniformity coefficient in the aquaculture tank (especially at the bottom), and the energy effective utilization coefficient was revised to evaluate the energy efficiency of the aquaculture system.The simulation results show that the smaller the inlet diameter ratio parameters can significantly improve the average velocity and energy efficiency in the aquaculture tank, which is conducive to the formation of uniform and stable flow field. The results show that increasing the relative inflow distance C/B from 0.00 to 0.05 can effectively improve the flow field characteristics in the aquaculture pond. For the single-drain rectangular arc angle aquaculture tank, setting the relative inflow distance C/B between 0.02 and 0.04 is conducive to obtain the optimal flow field conditions for the aquaculture tank system.