Study On The Influence Of Central Insertion Structure On Flow Field And Separation Performance Of Hydrocyclone

Hydrocyclone is an effective separation device for separating two-phase fluids by using a centrifugal force field.Now it has been widely used in petroleum industry,chemical industry,metallurgy industry,mining industry,food industry,agriculture,environmental protection and many other fields.Considering the adverse effects of the air core,the researcher proposed to install the central rod structure at the axis of the cyclone to eliminate the air core and improve the separation efficiency.The feasibility of this idea was verified by experiments.However,for the study of such central insert structures,the influence of such central insert structures on the separation of cyclones is currently only studied from the indicators of cyclone separation performance,and the flow field characteristics of the cyclone structure of such a central insert structure are not fully understood.In this paper,the computational fluid dynamics software ANSYS Fluent 15.0 is used to select the appropriate calculation model and boundary conditions for the central rod,the central cone,the central inner diffuser and the central solid rod.The flow field is numerically simulated,and the influence of the central insertion structure on the flow field parameters and the separation performance in the cyclone is analyzed,and the inner surface of the central insertion structure and the inner wall of the hydrocyclone with the central insertion structure are analyzed.The volume distribution shows the erosion pattern of the central insertion structure and the inner wall of the hydrocyclone with the central insertion structure.The simulation results show that the addition of the central insertion structure can improve the stability of the flow field in the cyclone and improve the separation performance of the cyclone compared with the conventional hydrocyclone.However,after adding the central insertion structure,the wall surface of the hydrocyclone cone is more severe,and the central insertion structure needs to be further optimized.The simulation results also provide a reference for further optimization of the central insertion structure.