Influence of inlet structure on flow field in a rectangular arc angle tank in aquaculture
REN Xiaozhong1,2, WANG Jiangzhu2,3, ZHANG Qian2,3, YE Zhangying4, WAN Li3*, WANG Guofeng5
1.College of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, China; 2.Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China; 3.College of Ocean and Civil Engineering, Dalian Ocean University, Dalian 116023, China; 4. Key Laboratory of Equipment and Informatization in Environment Controlled Agriculture, Ministry of Agriculture and Rural Affairs, Zhejiang University, Hangzhou 310058, China; 5.Shenyang Institute of Engineering, Shenyang 110136, China
Abstract: The changes in flow field were measured in a rectangular arc angle aquaculture tank with physical model system of single channel sewage under different hydraulic driving modes by acoustic doppler velocimeter, including different inlet positions(single pipe inlet, double pipe interval inlet, and double pipe adjacent inlet), frequency of daily water exchange(60-120 times/d) and incident angle parameters of the inlet pipe(0-90°) in order to evluate the influence on the flow field of the inlet structure in the physical model test system of the aquaculture tank. It was found that the influent structure had significant effect on the distribution of flow field, with higher average velocity in the tank under the single pipe arc wall and the double-arc double-pipe water inlet position. The flow field velocity from the wall to the center was shown to be decreased first and then increased under the higher frequency of daily water exchange, with a non-linear growth relationship between the average velocity in the tank and the frequency of daily water exchange. The average velocity of the water body in the tank was increased first and then decreased with the increase in the inlet angle when the single pipe arc wall and the double-arc double-pipe water intake entered the water, with the incident angle from 0 to 90° in the inlet pipe. The findings indicated that the two inlet positions of single pipe arc wall and the double-arc double-pipe water inlet were used in the design of square arc-angle aquaculture tanks, with maximal average velocity of the water body in the tank, and the greater the number of daily cycles, the better the flow field in the tank, and the inlet angle of 50° in both types of inlet pipe. This finding can provide theoretical basis and optimal design parameters for the design of square arc angle aquaculture tank with industrial circulating water.
任效忠, 王江竹, 张倩, 叶章颖, 宛立, 王国峰. 方形圆弧角养殖池进水结构对流场影响的试验研究[J]. 大连海洋大学学报, 2020, 35(5): 726-732.
REN Xiaozhong, WANG Jiangzhu, ZHANG Qian, YE Zhangying, WAN Li, WANG Guofeng. Influence of inlet structure on flow field in a rectangular arc angle tank in aquaculture. Journal of Dalian Ocean University, 2020, 35(5): 726-732.
2020, Vol. 35 
