Gas dynamics modelling of a self-acting reciprocating compressor discharge valve in hyperworks CFD

Piston type compressors are used in many industries.The basic characteristics and performance of a reciprocating compressor depend significantly on the quality of the valves used.It is known that in some cases the losses in the valves reach about 35% of the energy used to move the compressor.At the present stage numerical modelling methods are actively used, which are realized in professional software systems of numerical modelling, such as "HyperWorks", based on the method of finite elements.In this paper, a numerical study of two-dimensional gas flow in a self-acting annular valve has been carried out using the AcuSolve solver of the HyperWorks CFD program.The discharge process at pressure ratio P=4.5 is considered.Boundary conditions are set on the basis of indication of air single-stage reciprocating compressor K-75.The gas flow is non-stationary with a change in the channel geometry in accordance with the verified technique of annular plate dynamics.On the basis of the analysis of incomplete valve opening, assumptions providing equivalent hydraulic resistance are adopted.As a result of numerical simulation, a visualization of fast flowing processes is obtained.Local parameters, integral flow rate is determined, and the loss of capacity during gas overflow is estimated.

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