Simulation Of The Screen Angle On The Internal Flow Field Of The Three-Product Hydro-Cyclone Screen

The three-product hydro-cyclone screen is a new type of slime classification equipment,which has achieved good application results in industry and has high research value and broad application prospects.The screen is an important part of the three-product hydro-cyclone screen,which has an important impact on the internal flow field.Studying the influence of the screen angle on the internal flow field has a high use value for further understanding and optimization of the three-product hydro-cyclone screen.In this paper,based on the CFD numerical simulation method,and the FLUENT software is used to iteratively obtain the flow field information of the equipment,and influence of different screen angles on the internal flow field of the equipment is discussed.By comparing the internal flow field information of the three-product hydro-cyclone screen with the along-flow screen and the radially arranged screen angle,it is found that the total pressure value outside the screen of the along-flow screen angle is greater,and the fluid flowed into the screen,showing a phenomenon opposite to the original tangential velocity direction.On the basis of the screen angle of the along-flow,the size of the screen gap was reduced,and it was found that the total pressure and the tangential velocity inside the screen was reduced,the tangential velocity outside the screen was increased.Comparing the structure of the back-flow screen with the screen angle arranged in the radial direction,it was found that the back-flow screen angle helps increase the pressure value and tangential velocity of the inside the screen and outside the screen,it is beneficial to eliminate the backflow of the fluid outside to the inside of the screen,the discharge flow outside the screen has increased,and the underflow and overflow flow have been reduced.On the basis of the back-flow screen angle,the effect of reducing the size of the screen gap on the internal flow field of the three-product hydro-cyclone screen is mainly manifested by the greater difference in pressure-difference between inside and outside of the screen,and the discharge flow outside the screen has been reduced,and the underflow and overflow flows have increased slightly.Studying the effect of the screen angle on the internal flow field with different parameter conditions found that increase the thickness of the cavity outside the screen or increase the number of outlets under the screen,when the screen angle is along the radial direction,the pressure difference between the inside and outside of the screen and the tangential velocity inside the screen increase;when the screen angle is along-flow,the pressure and tangential velocity near the screen decrease;when the screen angle is back-flow,the flow field changes less.The feeding speed is increased from 8.5m/s to 12m/s,the axial position of the backflow point in the three screen angles has not changed,the total pressure and velocity values have increased,and the flow rate of each outlet is increased at a similar growth rate to the rate of increase of the feed flow rate.In this paper,through the study of three-product hydro-cyclone screen with different screen angles,it is found that the back-flow screen angle,increasing the thickness of the under-screen cavity and the number of under-screen outlets are beneficial to the fluid through the screen and enhance the strength of the swirl in the screen.The research in this paper provides new ideas for the structural optimization of the three-product hydro-cyclone screen,and also lays a good theoretical foundation for better application of the equipment to production practice.