Research On The Coupling Fluid Field In Hydrocyclone

Hydrocyclone is a kind of high efficient separation device. It is widely used in petroleum,chemical, metallurgy, paper making, starch processing and waste water treatment and many other industries for its’ simple structure, compact equipment, no moving parts, separation efficiency high, processing capacity and lower equipment cost of a series of advantages. The coupling vibration problem between the fluid and structure almost in all industrial areas can be encountered, but for the normal operation of the hydrocyclone, the vibration problem is inevitable. The impact of motor rotation and fluid will cyclone induced vibration, vibration and further affect the stability of the flow field of the hydrocyclone, which will affect the internal flow field of hydrocyclone distribution and separation efficiency.This paper combined the characteristics of cyclone separator with the fluid domain, the control equations in fluid field was established, which was based on two-phase flow model with Reynolds shear force model to close the governing equations, and the the fluid field control equation was set up. The governing equation’s discretization was done through the finite volume method and the definition of the actual situation in the fluid boundary was set; the cyclone separator structure dynamic equation of the solid domain was established. And the Newmark equation was chosen to do the time integration of the dynamic equation, the two-way coupling method is used to establish the coupling interface physical quantity transfer equation,the calculation model of the cyclone separator two-way coupling was established. Using the fluid solid coupling model, the numerical simulation of cyclone separator in the uncoupled and coupled vibration was done with different exciting force and different entrance flow on the condition of flow field and the dynamic characteristics of the structure. The basin simulation results were analyzed, finally obtained the different parameters on the axial velocity, tangential velocity, radial velocity variation, and the pressure field and the separation efficiency of flow structure.The modal analysis test of cyclone separator was carried out, the structure frequency and mode shape under different flow rate were obtained, and the results were compared with the numerical simulation results, which verified the reliability of the simulation results. Under the periodic excitation, the vibration test of the structure of the cyclone separator under different inlet velocity was carried out, and the acceleration peak value of the two kinds of inlet velocity were obtained. The solid domain simulation results were analyzed to get the structure coupling interface speed, and the acceleration and displacement variables of time history response curve,and the simulate acceleration history response value is compared with the measured value, found that the simulation results could be more real reaction structure actually accelerated degree. The stress distribution and deformation nephogram of the interface structure of two kinds of entrance velocity results, the maximum value and the coupling interface of equivalent deformation stress distribution were obtained.The study of this subject, for the application of cyclone separator under vibration condition,could provide a theoretical basis for the improvement of operation parameters and cyclone separation technology, and would provide a reference for the research of fluid solid coupling.