进水结构对圆形循环水养殖池流场的影响

Effects of inlet structure on flow field of circular recirculating aquaculture tank

为精准设计工厂化圆形循环水养殖池的进水结构,基于计算流体动力学技术,采用Fluent软件建立数值模型模拟进水管在不同进水角度θ、进径比d/r、进水高度h工况下养殖池内的流场分布特性,并以平均速度v_(avg)和均匀系数U为评价指标,对进水结构进行优化分析,在物理试验证明该数值模型能较好地模拟养殖池内的流场特征的基础上,模拟了不同进水结构对流场分布的影响。结果显示:在相同条件下,进水角度θ在40°时v_(avg)取得最大值,水层之间的U差异较小;进径比d/r在0.1时v_(avg)和U取得较大值,水层之间的U差异较小;进水高度h在100~400 mm时v_(avg)取得较大值,且在h=100 mm时水层之间的U差异最小。研究表明,当进水角度θ=40°、进径比d/r=0.1、进水高度h=100 mm时,养殖池内流场特性处于较优状态。

To accurately design the inlet structure of the factory circular recirculating aquaculture tank,based on the computational fluid dynamics technology,fluent software was used to establish a numerical model to simulate the flow field distribution characteristics of the inlet pipe in the pond under different inlet anglesθ,inlet diameter ratio d/r,and inlet height h in this study.The average velocity v_(avg)and uniformity coefficient U were used as the evaluation indexes,and the inlet structure was optimized and analyzed.On the basis of physical experiments that the numerical model can better simulate the flow field characteristics in the aquaculture pond,the effects of different inlet structures on the flow field were simulated.The results showed that under the same conditions,the maximum v_(avg)was achieved atθ=40°and the U difference between water layers was minimized;the larger v_(avg)and U was achieved at d/r=0.1 and the U difference between water layers was minimized;the larger v_(avg)was achieved at h=100~400 mm and the U difference between water layers was smallest at h=100 mm.It was shown that the flow field characteristics in the pond were in an optimal state when the inlet angleθ=40°,inlet angle d/r=0.1 and the inlet height h=100 mm.