Study On Flow Characteristics Of Two Phase In The Hydrocyclone Under Fluid Structure Interaction

The internal fluid pulsation can produce structure vibration of hydrocyclone in operation,which makes the internal two-phase strong spiral flow more complicated under the interation of structure and fluid. At present, the experimental research and numerical simulation studies on the structure of hydrocyclone almost ignored the coupling effect of fluid and structure on the internal two-phase flow field.in this paper, the characteristics of two-phase flow in hydrocyclone under coupling effect are studied. The motion characteristics of the two-phase fluid in the coupled vibration is discusssed, The velocity distribution, pressure distribution and concentration distribution of the fluid structure interaction in the cyclone are displayed which provided basis for the structure design and engineering application of hydrocyclone.Therefore, this study has important scientific significance and practical value.The hydrocyclone with a typical double cone structure is selected as the research object in this paper, and the interaction of the fluid and the structure is considered Reynolds averaged navier stokes equations is applied to deal with the basic governing equations of two phase flow in a hydrocyclone,And the Reynolds stress turbulence model is used to seal the governing equations of the fluid. Acoording to the finite volume method, the governing equations of fluid field are established.The finite element theory is applied in solid domain,By the method of Newmark, the dynamic equation of variable diameter circular pipe structure is carried on the time integral.The interaction of the fluid and the structure is considered, the physical quantity transfer equation of the coupled interface is established, he staggered iteration calculation method of coupled solutionis is adopted, he two-way FSI model of the hydrocyclone is presented.By using the fluid structure interaction model, the numerical simulation of oil-water two-phase flow in hydrocyclone under different inlet velocities of coupling and non coupling conditions is carried out. The difference and the distribution between the coupling and non coupling flow field and the influence of two phase concentration distribution and the pressure distribution on the separation performance are obtained through the comparative analysis of the convection field, And the numerical simulation of the flow field in the single phase medium of the organic glass material is made. The coupling flow field was tested by the LDV test technology, and compared with the non- coupling effect of the flow field. The study shows that the coupling flow field is in good agreement with the measured flow field.The rationality of fluid structure interaction model established in this paper is verified.The model test and numerical analysis of the organic glass material hydrocyclone are carried out by means of fluid structure interaction method, which obtained the vibration characteristics. By comparing the measured data with the numerical calculation results, the first three orders of the vibration frequency and vibration mode are consistent. The rationality of the coupling model is verified from the point of view of structural vibration characteristics.The above analysis shows that the two-way FSI calculation model of hydrocyclone isreasonable. The influence of coupling effect on flow field cannot be ignored. The interaction of fluid and structure not only changes the flow field distribution, but also changes the movement characteristics of the structure, These are important influencing factors that should be considered in the design and application of hydrocyclone.