Research On Assembly High-speed Rotary Drum Stress And Optimization Based On Fluid Dynamic Characteristics

Disc separator is a centrifugal separation equipment which can separate the liquid-solid(low concentration suspension liquid)and liquid-liquid(emulsion)by using thin layer separation principle.With the advantages of short production process,high production efficiency and excellent separation ability,it is widely used in pharmaceutical,food,chemical industry,machinery and other industrial production area.The internal flow field in the the drum is complex when the disc separator is working,the flow is in the states of high speed rotating and thin layer flow,and there are numerous vortex.For the drum high speed rotation and the limitation of its structure,it is difficult to accurately calculate the flow field distribution inside the drum and the structure stress by the traditional experimental methods and theoretical studies.In this paper,use the Fluent fluid simulation software to establish the two-dimensional model of the latex separator drum internal flow field,according to the theory of fluid dynamics.Based on the mixed multiphase flow model and laminar flow model,internal flow field of the drum is simulated,the calculated pressure and velocity distribution is consistent with the theory analyzed result.Study the pressure and velocity change law under different rotating speed,and the influence of rotating speed on the separation efficiency.By analyzing the phase diagram of liquid-liquid(thick milk and water)two phase flow under the normal working conditions,it is more clear and intuitive to understand the heavy phase(water)and light phase(thick milk)separation process.Furthermore,the fluid flow characteristics at the outlet are analyzed.Research has shown that all the flow field pressure distributions are quadratic functional form with the radius at different speed.The increasing of speed is conducive to improve separation efficiency,but the rate of improve gradually decrease.The vortex at the outlet will bring some harmful influence on the separation effect.In addition,this paper put forward a simplified solution of internal fittings and use the AWE(Ansys Workbench Environment)software,combining the fluid simulation results,conduct the the drum structure statics analysis on three different rotational speed,check the drum,drum cover and lock ring whether meet the strength requirements or not.The drum body stress concentration area is analyzed further by using the method of equivalent stress linear,and its strength is tested.Based on the analyses and the test,the multi-objective driven optimization design on the body of rotating drum is carried out.Research shows that the project internal fittings design can more objectively reflect the actual working condition,the three drum components can satisfy the requirements of strength.Some positions such as drum body sediment area,thread,relief groove are the local stress concentration areas,structural optimization must be taken to reduce stress concentration,optimization of the drum body eventually can reach the purposes of reducing 4.29% equivalent stress of the drum body,decreasing 5.85% material,0.65% less of the total deformation.