基于CFD的池塘循环水养殖集污装置排污性能研究

Research on the Discharge Performance of Recirculating Aquaculture Seawater Pond Sewage Collection Device Based on CFD

为了研究一种应用于海水池塘循环水养殖系统集污装置的排污性能,采用计算流体力学(computational fluid dynamics,CFD)方法对集污装置流场进行数值模拟,研究颗粒释放位置和粒径大小对集污装置颗粒去除效果的影响。结果表明:释放位置接近引水槽底面时,随颗粒释放位置深度的增加,集污装置底部出口的颗粒去除率增大;由于重力和流场等因素作用,底部出口颗粒平均停留时间随释放位置深度的增加而呈现先减小后增加的趋势;粒径较小的颗粒主要从集污装置上部出口流出,且平均停留时间较短;集污装置底部出口的颗粒随着颗粒粒径增大,去除率增大,颗粒平均停留时间逐渐减小;当粒径超过150μm时,颗粒在集污装置内平均停留时间有所增加。

To investigate the discharge performance of a sewage collection device used in a seawater pond recirculating aquaculture system,computational fluid dynamics(CFD)simulations were conducted to analyze its flow field.The study aimed to examine how particle release positions and sizes affect the device s efficiency in particle removal.The findings indicate that positioning particle release closer to the bottom of the diversion trough increases the depth of release and enhances particle removal at the device s bottom outlet.The average residence time of particles at this outlet varies with release depth,influenced by gravitational and flow dynamics.Smaller particles primarily exit through the upper outlet,resulting in shorter residence times.Conversely,larger particles demonstrate increased removal rates at the bottom outlet and generally shorter residence times.However,particles larger than 150μm tend to exhibit longer residence times within the collection device.This research on sewage discharge performance offers valuable insights for developing sewage collection devices tailored for seawater pond recirculating aquaculture systems.