The Fluid-Structure Interaction And Structure Optimization Of Tube Separator

Tube separator is a kind of gravity type sewage treatment equipment,which is designed basing on “the principles of shallow pool”,and has the advantages of efficient oil removal and small occupation area.This equipment can separate the oil-water mixture through the mechanism of gravity differentiation of oil-water mixture and accumulation of discrete oil in the tuber groups and lift.Therefore it belongs to typical fluid-structure interaction coupling system,which refers to a series of fundamental mechanics problems,such as oil-water two phase flow in the tube groups,fluid-structure coupling interaction,oil-water separation,buoyancy lift etc.The problems above are studied in this thesis as follows:(1)Base on the characteristics of the equipment,a fluid-structure mechanics model is established for this equipment system,which lays a foundation for quantitative study of basic mechanics properties of the tube separators,including oil-water two phase flow/separation and dynamic structure parameters;(2)For the tube separators,the numerical simulation models of fluid and structure are established separately by professional meshing software ICEM-CFD.Through fine hexahedral grids and composite grids,the interface coupling of fluid-structure is processed,as well as the difficult coordination problem of composite structure including pipe,beam and plate;(3)The dynamic parameters of oil-water two phase flow in the tube separators are calculated by the fluid dynamics software FLUENT,and the function of the buffering rectifier water distribution plate is compared,and then the influence of inlet flow rate on the flow field parameters in the equipment is inquired;(4)Taking both the fluid-structure coupling model and the fluid-solid simulation technique in Workbench as a combination,the structural response of the equipment effected by the fluid is studied;the hydrodynamic parameters variation,structure deformation and oil-water separation efficiency are calculated separately,which are caused by the inlet flow rate during the equipment operation,liquid sloshing during equipment flitting and hoisting,and pitch angle change of the tube groups;(5)Based on both the oil-water two phase flow parameters of tube groups and the fluid-structure interaction and dynamic response,the structure of the equipment is optimized,and the equipment improved have important advances for improving efficiency of oil-water separation and strengthening structure safety,etc.