不同底面坡度的循环水养殖池塘净化效能

Purification efficiency of a recirculating aquaculture pond with different bottom slopes

以一种典型的方形切角养殖池为研究对象,建立液固两相流场的数值模型,重点分析池塘底面坡度和水动力条件对其水质净化效能的影响规律。研究表明:随着养殖池内部压力的降低,颗粒物受到的作用力减小,沉积浓度增加;当水流回转速度不变时,随着养殖池底面坡度的增加,颗粒物的分离效率提高;当水流回转速度为0.25 rad/s,且底部坡度为12°时,养殖池的净水效能最高;数值计算结果与实验数据吻合较好,验证了数值计算方法的有效性。研究结果对于池塘水循环养殖系统的优化设计、评价鱼类生存的水动力学条件、解决水循环效能低、集污/排污率差等问题具有重要科学意义和工程应用价值。

Taking a typical square chamfered aquaculture pond as the research object, a numerical model of the liquid-solid two-phase flow field was established, and the influence of the slope of the pond bottom surface and hydrodynamic conditions on its water purification efficiency was analyzed. Studies have shown that as the internal pressure of the aquaculture pond decreases, the forces on the particulate matter decrease and the sediment concentration increases;When the rotation speed of the flow is constant, the separation efficiency of the particles increases with the increase of the bottom slope;when the rotation speed of the flow is 0.25 rad/s and the bottom slope is 12 °, the water purification efficiency of the aquaculture pond is the highest;The numerical calculation results are in good agreement with the experimental data, verifying the effectiveness of the numerical calculation method. The research results have important scientific significance and engineering application value for the optimal design of the pond water circulation aquaculture system, the evaluation of the hydrodynamic conditions of fish survival, the solution to the problems of low water circulation efficiency and low efficiency of sewage collection.