| China is a major aquaculture and consumer country and in recent years,factory aquaculture has become the mainstream direction of aquaculture due to its stable,high quality and high yield characteristics,and factory aquaculture technology has been greatly developed.However,in the process of factory aquaculture,the problem of temperature control in winter aquaculture heating has not been effectively solved,especially for the northern regions of China,where the cost of winter heating is higher,and some regions have abundant geothermal water resources,which can be used to reduce the cost of temperature regulation.Therefore,it is important to investigate the structural conditions of temperature control related to the regulation of temperature and salt mixing in factory farming.In this paper,a three-dimensional numerical model of the thermoregulation basin was constructed based on the three conservation equations and the component transport equation,using the RNGk-ε model.The temperature and salinity distribution in the model was analysed parametrically by applying ANSYS Fluent fluid dynamics calculation module.Based on the above rules,relevant design suggestions are made for the structural design of different fish factory farming thermoregulation ponds.The specific research content is as follows.(1)Apply the ANSYS software Fluent fluid dynamics calculation module to construct a threedimensional numerical calculation model of the thermoregulation pond,select a suitable specific mesh division method and mesh quantity,and compare the constructed numerical model with the physical test results in published papers.The results prove that the numerical model established in this paper is more reasonable and the results meet the calculation accuracy requirements,which can be applied to the mixing process of low-temperature seawater and The results prove that the numerical model established in this paper is reasonable and the results meet the requirements of calculation accuracy.(2)According to the three-dimensional model established in the paper,adjust the structural parameters of the three-dimensional numerical model of the tempering pool,and analyse the influence of the tempering pool with different parameters on the temperature and salt variation law in the mixing process of low-temperature seawater and geothermal freshwater,focusing on the temperature and salt variation law at the outlet,so as to provide a suitable structural form for improving the temperature and salt mixing effect.(3)Adjust the type and height of the thermostat pool,select the optimum temperature and salt mixing conditions,and provide suitable aquaculture water for industrialized aquaculture.By upgrading the numerical model of rectangular thermostat pool to the numerical model of rectangular arc angle thermostat pool,analyze the influence of the optimization of arc angle on the process of temperature and salt mixing,and focus on the temperature and salt changes at the outlet.To provide suitable structural conditions for mixing temperature and salt in the thermostat.(4)On the basis of the model of rectangular arc-angle thermostat,the inlet and outlet water system is optimized,and the mixing effect of temperature and salt in the thermostat is optimized by adjusting the position of intake pipe,inlet flow rate and outlet position,so as to provide the most suitable inlet and outlet water system for the heating of geothermal water for marine aquaculture.(5)According to the requirements of factory aquaculture enterprises,the water temperature requirements of different fish species are analyzed.Based on the numerical model,suitable thermostat pools are selected for different fish species,the temperature changes in the thermostat pools are analyzed,and the appropriate structure conditions and real-time frequency of temperature adjustment are selected to provide design basis for improving the production efficiency of marine aquaculture. |
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