The Numerical Simulation Analysis Of Multi-field Coupling In Typical Mechanical Components Based On Fluid-solid Coupling

Machinery plays a more and more role in the human'production and life,as the fluid-soild interaction from was found till now,it plays a more and more important role in many areas,it is the main research deformation of solids in the flow field under the action of all sorts of behavior and solid configuration flow field affect the interaction of a discipline.Aerospace engineering,for example,the aircraft aerodynamic problem of elastic vibration,supersonic speed shell wind resistance and containing liquid container sloshing problems;Water conservancy facilities and ocean engineering structure water elastic vibration problems;Underground reservoir(oil,gas,water,coal)porous medium permeability;Stay-cables bridge wind vibration problems.How to make mechanical components in complex environment stable,safe and efficient operation and the ability to solve the problem of complex coupled fluid-soild interaction theory,combining to make more and more scientists and engineers devoted to the research.In this paper,by using the principle of the fluid-soild interaction to analyze typical rotating and driving performance problems in the process of mechanical parts work: 1,under different working condition of centrifugal sand pump absorption the operation of the internal flow field in the position and the function of the coupling of custom pressure pulsation.2,different oil quantity and speed the transfer case oil under the condition of stirring situation analysis.Based on the computational fluid dynamics,finite volume and one-way two-way coupling principle,based on the theory of establishing the calculation model of the fluid mechanical components,provided based on CFX multiphase flow model and turbulent model and small deformation move grid technology as well as the ICEM mesh script file technology,numerical simulation analysis was carried out on the flow field in the mechanical parts,three dimensional flow field is obtained by the calculation results post-processing of velocity field and pressure field distribution,reflects the solid liquid two phase and gas-liquid two phase fluid motion and under various parameters influence.Through numerical analysis,provide theoretical basis for the design of mechanical products,greatly shorten the design cycle,reduce the design cost,improve and improve the performance of mechanical device,the possible problems in the process of using make predictions.In this paper,the analysis of mechanical parts are provided for the enterprise,using the CFD(Computational Fluid Dynamics)method to analysize the flow field state.This paper made the following research:1,using UG software,and the method of 3 d reverse analysis object-centrifugal sand pump absorption and transfer model,in order to reduce the computational cost and analyze the issues that need to be,of the two kinds of mechanical parts part has carried on the feasible within the scope of the simplified,and then to carry on the grid,and then import the provided by CFX Pre set the boundary conditions and initial conditions,choose and set up corresponding model of multiphase flow,calculating RNG k-epsilon and dynamic grid turbulence model,the component simulation analysis was made on the internal flow field of two phase flow.More truly reflects the solid liquid and gas liquid two phase under transient velocity vector,the distribution and variation of pressure potential conditions.2,typical rotating parts for centrifugal sand pump,water pump water through the pump experiment center in the country working condition of experiment,get the centrifugal sand pump absorption external characteristic curve,and the simulation of the characteristic curve of error less than 3.1%,the experiment effectively guarantee the accuracy of the simulation object;Then using different size and different speed conditions,the centrifugal sand pump absorption velocity analysis,in single and double coupling analysis to the impeller,the impeller velocity vector distribution.Respectively,at some point in the impeller on the custom work get higher speed and lower than rotating speed of the vane under radial force distribution,get that point.As to conclusions: single and double to coupling does not change the overall trend of the flow field,the partial position,impeller deformation and destruction of the symmetrical structure,area to the leaf turns fields have different degrees of impact,with the accumulation of time and space,the formation of vortex,even safe operation of pump cavitation damage.3,for the typical transmission parts transfer,internal flow field numerical simulation of the transfer motion,then gear select uniform rotation under the working condition of a certain speed,oil injection of different volume of lubricating oil is above and below the XY datum plane 49.35 mm and XY plane numerical simulation analysis,the conclusion.That is too low and too high amount of oil will be led to a decline in efficiency of mixed oil lubrication,or mixed oil losses increase.And the position of the helical gear is higher than the hypoid gear position,but the lubrication effect is generally better than that of the hypoid gear.And choose a fixed oil surface height,choose a different speed conditions,low speed under the condition of oil stir not easy stable status;High speed increased the oil under the condition of stirring,stirring splash into the wall of oil increased,hypoid gear meshing area of the mixing oil loss is reduced,but the helical gear meshing area with solid liquid phase coupling of gas and liquid phase coupling,loss increase.