Flow Field Simulation And Parmeter Optimization Of Aquaculture Water Solid-liquid Hydrocyclone Separator Based On CFD

With the continuous improvement of the scale of aquaculture,it is facing the pressure of the destruction of water resources,the increasing of diseases,the extrusion of the coastal industrial land and the national advocacy of energy saving and emission reduction.It is urgent to construct the economic and effective treatment facilities.In these treatment facilities,hydrocyclone has a good application prospects in aquaculture due to its high processing capacity,low cost of purchase and operation.However,because the density of suspended particles in aquaculture water is similar to that of water,the distribution of particle size is very large,which makes it difficult to remove the swirling particles of suspended particles in aquaculture water,and the removal efficiency is not high.On the basis of measuring the parameters of suspended solids in aquaculture water,a solid-liquid cyclone separation device for turtle water is designed.The corresponding CFD simulation model is established,and the influence of the parameter changes on the separation performance of the hydrocyclone was studied.Optimizing the parameters of the hydrocyclone to improve the separation performance of the device.The numerical simulation is used to guide the physical test,save the cost of the test and improve the efficiency,providing reference and scientific basis for the design and research of the solid-liquid cyclone separation device in aquaculture.1.The parameters of solid particles in the aquaculture water were measured,and then the main parameters of the aquaculture hydrocyclone-the main diameter,inlet diameter,bottom flow diameter,overflow diameter and structure were determined according to the determination of the parameters of the suspended solids suspended particles in aquaculture water.2.The CFD model of the flow field of the cyclone separator is established.The turbulent flow in the cyclone separator is simulated by using the RSM model.The Mixture model is used to describe the multiphase flow in the device.The simulation results are compared with the test results.The simulation results are in good agreement with the test results,and the reliability of the established CFD model is proved.3.Two basic structural parameters-column height and cone angle will affect the flow field,the pressure drop,flow ratio and separation result of the hydrocyclone.The variation of cone angle has great influence on the bottom water,and has little effect on the overflow water.Properly increasing of cone angle(90°～120°)has a positive effect on the separation of solid particles.The change of column height has a great influence on underflow and overflow water.Increasing the column height appropriately is beneficial to the separation of solid particles.When the column height is 2D(D is the main diameter of the hydrocyclone),the hydrocyclone has better separation performance for solid particles.When the cone angle is 90° and the column height is 2D,the separation efficiency of the hydrocyclone is 27.18%.4.The effects of two basic operating parameters:inlet flow rate and inlet concentration on the separation performance of the hydrocyclone are discussed.The influence of parameter modification on the flow field distribution,pressure drop,shunting ratio and separation result is quantitatively analyzed.The change of inlet flow and inlet concentration has great influence on underflow and overflow water.Under the condition of ensuring the production efficiency,the separation effect of solid particles can be improved by reducing the inlet flow and decreasing the inlet concentration properly.