| 基于流态的方形圆弧角养殖池进水系统优化数值研究 |
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| 引用本文： | 胡艺萱,刘鹰,任效忠,李猛,毕春伟.基于流态的方形圆弧角养殖池进水系统优化数值研究[J].水产学报,2023,47(5):059516-059516. |
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| 作者姓名： | 胡艺萱 刘鹰 任效忠 李猛 毕春伟 |
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| 作者单位： | 设施渔业教育部重点实验室大连海洋大学,设施渔业教育部重点实验室大连海洋大学,设施渔业教育部重点实验室大连海洋大学,设施渔业教育部重点实验室大连海洋大学,大连理工大学 海岸和近海工程国家重点实验室 |
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| 基金项目： | 国家自然科学基金面上项目(31872609)；国家重点研发计划项目(2017YFD0701701)；南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0402)；广东省重点领域研发计划(2019B020215001) |
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| 摘 要： | 为研究进水系统优化对方形圆弧角养殖池内流场特性的影响，实验运用计算流体动力学仿真技术(CFD)构建方形圆弧角养殖池的三维数值湍流模型，单管进水系统设置在养殖池弧壁的中间位置(以下称弧壁单管)，并主要对不同进径比(参数C/B，射流管中心位置到养殖池壁的水平距离C与养殖池短边边长B之比)和不同射流角度对养殖池系统内的流场特性开展研究。结果显示，不同进径比条件下，随射流角度增加养殖池水体平均速度均呈现先增大后减小的趋势，且最优射流角度不同。进径比为0.01且射流角度为45°时，养殖池内部流场平均流速最高。进径比为0.03时，最优射流角度为30°。当C/B=0.05～0.13时且射流角度为25°时，水体平均速度最高且流场均匀性较好。进径比C/B=0.07～0.09、射流角度为25°时，养殖池内部流态总体上优于其他工况。研究表明，养殖池流场特性与进水系统进径比和射流角度密切相关。研究结果可为工厂化循环水养殖进水系统设计和优化养殖池系统的流场特性提供理论依据。
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| 关 键 词： | 养殖池 进水系统 计算流体力学 流场特性 |
| 收稿时间： | 2021/12/22 0:00:00 |
| 修稿时间： | 2022/10/24 0:00:00 |
Numerical study on optimization of inlet system of square arc angle aquaculture tank based on flow pattern |
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| HU Yixuan,LIU Ying,REN Xiaozhong,LI Meng,BI Chunwei.Numerical study on optimization of inlet system of square arc angle aquaculture tank based on flow pattern[J].Journal of Fisheries of China,2023,47(5):059516-059516. |
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| Authors: | HU Yixuan LIU Ying REN Xiaozhong LI Meng BI Chunwei |
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| Institution: | Key Laboratory of Environment Controlled AquacultureMinistry of EducationDalian Ocean University,Key Laboratory of Environment Controlled AquacultureMinistry of EducationDalian Ocean University,Key Laboratory of Environment Controlled AquacultureMinistry of EducationDalian Ocean University,Key Laboratory of Environment Controlled AquacultureMinistry of EducationDalian Ocean University,State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology |
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| Abstract: | The aquaculture industry is now in a state of changing, from traditional to modern, from extensive to accuracy aquaculture, with Recirculating Aquaculture System as a creative and efficient aquaculture model, in which reasonable design and optimization of the structure of the aquaculture tank are adopted, which are the key measures to optimize constraints on limited resources and to meet large output requirements. Domestic and foreign studies concentrated on the impact of the jet direction on the aquaculture tank, but not the impact of relative inflow distance on internal flow field features of aquaculture tank. This paper mainly studies the effects of jet angle and relative inflow distance on the internal flow field features of aquaculture tank, analyzes the hydrodynamic features of aquaculture tank applying different inlet structure layout, so as to provide a theoretical basis for the inlet structure design of Recirculating Aquaculture System.In order to study the effects of inlet system optimization on the flow field features in the square arc angle aquaculture tank, under the application of Computational Fluid Dynamics simulation (CFD), a three-dimensional numerical turbulence model of the square arc angle aquaculture tank is constructed. The single tube inlet system is allocated in the middle of the arc wall of the aquaculture tank (hereinafter referred to as: arc wall single tube), and is adopted in the study of different inlet diameter ratios (parameter C/B, the ratio of the horizontal distance C from the center of the jet tube to the tank wall, to the length B on the shorter side of the tank) and different jet angles toward the flow field features in the tank system. In order to verify the validity of the numerical model and the precision of the simulation, a real model, an identical numerical model is established for experiment. Monitoring point velocity of the actual physical model is measured by vectrino acoustic Doppler point velocity meter, and is compared with the velocity at the same position of the numerical model. It can be told that the numerical model established in this study is reasonable, as the relative errors of observation points are within 10%.The experiment result shows that under different inlet diameter ratios, the average velocity of tank water increases at the beginning and decreases with the increase of jet angle,and the optimized jet angle is different. When the inlet diameter ratio is 0.01 and jet angle is 45°, the average velocity of the tank flow field reaches to the highest. The optimized jet angle is 30° when the inlet diameter ratio reaches 0.03. The average velocity of water reaches to the highest and the flow field uniformity has a fairly good condition under the situation that C/B=0.05-0.13 and the jet angle is 25°. From the experiment it is found that the internal flow field features of single tube aquaculture tank are significantly affected by the inlet angle and diameter ratio of the inlet system, and the optimized jet angle of each inlet diameter ratio of square arc angle aquaculture tank differs with each other. Between the range of C/B=0.01-0.13, it can be observed that the optimized jet angle decreases rapidly to a stable trend while inlet diameter ratio increases, As a result, the layout of the inflow system of the aquaculture tank involves the two parameters of inlet diameter ratio and jet angle in a comprehensive way, and make sure them are matching. According to the relative inflow distance data, the results show that with the increase of inlet diameter ratio, the optimal average velocity curve of water body first increases and then decreases. When the inlet diameter ratio is 0.09 and the jet angle is 25°, the velocity is the maximum. The optimal angular velocity of inlet diameter ratio 0.09 is about 28.13% higher than that of inlet diameter ratio 0.01, and the optimal velocity of water body at inlet diameter ratio 0.13 is about 10.45% lower than that at inlet diameter ratio 0.09.When the relative inflow distance reaches 0.07-0.11, the uniformity coefficient reaches the peak value when the jet angle is 25°. Although there are still dense contour areas under this jet condition, there are few locally closed annular contour areas in the aquaculture tank, more high velocity areas and no obvious low velocity areas, so the water body uniformity is good at this time. According to the comprehensive analysis of the internal flow velocity, flow field uniformity and internal characteristic diagram of the flow field in the aquaculture tank,under the condition that the inlet diameter ratio C/B=0.07-0.09 and the jet angle is 25°, the internal flow pattern of the aquaculture tank is generally better than other working conditions, the average velocity of the water body in the aquaculture tank shall be high, with fairly good uniformity, no obvious low velocity area. In the meantime, the flow environment of the aquaculture tank achieves the best, and the correstanking flow conditions accommodate the needs of Recirculating Aquaculture System better, reducing energy consumption and building a steady flow system. This study demonstrates that the flow field features of the aquaculture tank are closely related to the inlet diameter ratio and jet angle of the influent system. This research will provide a basis for influent system of Recirculating Aquaculture System designing and the optimization of its flow field features. |
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| Keywords: | aquaculture tank water inlet system computational fluid dynamics flow field characteristics |
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