Motion Analysis Of Rotary Compressor Valve Base On Fluid-Structure Interaction Method

For its advantages of simple structure, small size, light weight, rotary compressor is widely used in household air-conditioners and refrigerators. Currently, there is no better alternative model of rotor compressor below2.2kw air-conditioners. Towards the direction of energy saving, lower noise and intelligent control, the domestic and international research on rotary compressor has been increasingly furthered strengthened. Compressor exhaust valve is one of the key parts. Its designation has a direct impact on gas displacement, power and reliability of compressor. This article adopts numerical simulation method to research the influence of flow field of rotary compressor cylinder cavity and muffler cavity, the movement of the valve on rotary compressor performance.This article adopts three-dimensional software (Solidworks) to establish the actual size geometric model of rotary compressor. Model includes the suction part, exhaust part, the cylinder cavity and the muffler cavity (Section A and Section B). Adopting ICEM CFD software to divided grids on geometric model, in which, the cylinder cavity and muffler (Part B) with hexahedral grids, muffler cavity (Section A) with tetrahedral grids. Importing grids into CFX-Pre and forming a complete flow field, setting the boundary conditions and initializing conditions, using RNG κ-ε model. In the motion of exhaust valve, not only the flow field has an impact on the role of valve, but also the motion of valve has an impact on flow field distribution, solution method relates to fluid-structure interaction. It will take using Workbench+CFX software cooperation to achieve. Fortran procedure controls grids updating (Implementation of the dynamic mesh) of the flow field of cylinder cavity and the muffler cavity (Section B).This article has simulated the same lift and different thickness, the different lift and same thickness valve of rotary compressor. The results were compared with theoretical cycle and actual working conditions to verify the simulation accuracy. This numerical simulation method can be applied to engineering practice, and provide an important analytical tool for rotary compressor and the design of valve.