| The internal flow field of a three-screw pump is composed of two parts: the flow field of a spiral groove channel and the gap flow field between the satellite screw and screw housing.Based on the computational fluid dynamics model is used to calculate characteristic parameters of the flow field of spiral groove channel formed by central and satellite screw and bushing,which the instantaneous simulation model is established by the three-dimensional static grid.Fluent software is used to solve the problem,and the flow field characteristics of the channel are analyzed with the results of the calculation.Based on the theory of hydrodynamic lubrication,the coupling model of dynamics and tribology is established to analyze the distribution rule of oil film thickness,load distribution and bearing capacity between the satellite screw and screw housing of three-screw pump’s processing to improve the research of the three-screw pump flow field.Based on the computational fluid dynamics model is used to calculate the boundary conditions,because the selection of boundary conditions directly affects the calculation results of the coupling model.The influence of structural parameters and operating parameters on numerical simulation is explored with the eccentricity ratio and speed as an example.The computational fluid dynamics model is used to calculate the boundary conditions because the selection of boundary conditions directly affects the calculation results of the coupling model.To verify the accuracy and feasibility of the numerical simulation and coupling model,a three-screw pump test platform is built to test the data’s inner pressure.In this paper,a method to study gap’s flow field and the dynamic and tribological coupling model are presented.Based on the analysis of the whole flow field of the three-screw pump proposed,the working mechanism of the three-screw pump is further understood.In addition,it provides a new thinking and the design of high performance and low noise screw pump. |
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