Influence of single inlet pipe structure on hydrodynamic characteristics in single-drain rectangular aquaculture tank with arc angles
YU Linping1， XUE Boru 1,2， REN Xiaozhong 2,3* ， LIU Ying 2,3， XU Tiaojian 4， SHI Xianying 1， HU Yixuan 2,3， ZHANG Qian 1,2
1.College of Ocean and Civil Engineering, Dalian Ocean University; 2.Key Laboratory of Environment Controlled Aquaculture, Ministry of Education; 3.College of Marine Technology and Environment, Dalian Ocean University; 4.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology
A three-dimensional numerical model was established based on the finite volume method and the finite difference method, and the effects of different number of hole (times of daily cycle) and inlet pipe position on the flow field of a single inlet pipe structure in a rectangular aquaculture tank with arc angle were investigated to evaluate the influence of inlet pipe structure and design parameters on the hydrodynamic characteristics of recirculating aquaculture tanks by fluid dynamics simulation technology. The hydrodynamic characteristics of the bottom in the tank were analyzed, especially, the characteristics of complex flow field near discharge outlet in the tank. The results showed that increase in the times of daily cycles (the number of hole) led to improve the average velocity and uniformity of velocity distribution in aquaculture tank; and that the inlet pipes disposed in the arc angle of the tank is the optimum position to ameliorate the bottom hydrodynamic characteristics in the aquaculture tank. The findings indicated that the arc angle of the tank, which times of daily cycles are 100-120 (in this study, the number of holes are 18-21) and the optimal flow field can be achieved in the aquaculture tank, especially at the bottom, which provides a reference for the parameter design and the position selection of the inlet structure of a rectangular circular arc angle aquaculture tank.
2020, Vol. 35 
