Simulation Optimization Study Of A New Type Of Super Gravity Field Hydrocyclone

According to requirements of the subject, The dissertation Combines the characteristics of hydrocyclone and centrifuge separation equipment to design the super gravity field hydrocyclone that is for classifying and recycling ultra-fine particle。Using theoretical fluid dynamics, computational fluid dynamics, fluid dynamics test to study the aspects of pressure flow field, velocity, turbulence intensity, grading effect inside of Super gravity field hydrocycloneBasing on the theory of fluid dynamics to establish The dissertation establish the continuity equation, Euler equilibrium differential equation, Bernoulli equation, Navier-Stokes Equations in rotating coordinate system inside of Super gravity field hydrocyclone. It lays the foundation of theoretical study for Super gravity field hydrocycloneIn this dissertation, the Euler method is established.using RNGK-turbulent model, MRE and VOF Multiphase flow simulation.Three dimensional mathematical model of the single phase and two phase flow field in the super gravity field hydrocyclone was established.By using the control volume method and SIMPLE algorithm.According to the actual situation to determine the reasonable boundary conditions, Numerical simulation of single phase and two dimensional multiphase numerical simulation by using FLUENT software. The pressure distribution at different speeds, tangential speed, radial velocity and axial velocity in the initial stage of Super gravity field hydrocyclone is analyzed.According to the characteristics and laws of the distribution of turbulence intensity, we can conclude that the internal pressure distribution in the super centrifugal force field is relatively uniform and the Internal pressure distribution is similar.This shows that there is almost no pressure drop in the axial direction, this is conductive to the classification of fine grain materials.lt is shown that the change of tangtial velocity is in the form of a combination of the free vortex and the forced vortex.It shows that Super gravity field hydrocyclone can be adjustable.Only adjust the speed of the motor can produce different sizes of Super gravity field hydrocyclone.To adjust the tangential velocity and the intensity of the grading, the axial velocity and the radial velocity of the design of the initial model are not very ideal.It will have a greater impact on the particle according to Super gravity field hydrocyclone classification.The feed pipe is found from the bottom in the direction of super cyclone centrifugal force field, to a certain extent,the air column can be suppressed, and the efficiency of the classification can be improved after eliminating the air column.This dissertation established a Super gravity field hydrocyclone test system, and test platform, which is based on the prototype of the original design.According to the actual situation, the separation effect of the rotational speed in 300r/min, 500r/min,700r/min,900r/min is studied.The high degree of consistency on test results and simulation analysis results has proved the correctness of numerical simulation model is established, and determined that we can use FLUENT numerical simulation tools to optimize the structure of super gravity field hydrocycloneAccording to the simulation results and experimental results, and aiming at the deficiency of the initial model, this dissertation optimized the structure of super gravity field hydrocyclone and has designed a new type of super gravity field hydrocyclone. Utilize FLUENT to take numerical simulation analysis again.The structure of the new design, which has the advantages of the original design, improves the stability of the flow field, and its’ formative distribution of the flow field, which is conducive to the classification of fine particles according to the size or density.It is proved that the axial velocity of the new...