Correlating the experiment and Fluid structure interaction results of a suction valve model from a hermetic reciprocating compressor

Paper #:
  • 2017-28-1948

Published:
  • 2017-07-10
Abstract:
The present paper investigates the effect of varying inlet pressures on the dynamics of the suction valve of a hermetic reciprocating compressor. The effect of valve functioning on the efficiency of a compressor is highly acceptable. Rather than delivery valve suction valve has major impact on the compressor efficiency. The reed valve in a hermetic compressor is generally a cantilever type arrangement. The valve operates due to the pressure difference between the suction muffler and the cylinder. Numerical analysis which includes Fluid structure interaction is used in the present study. The flow and structural domain used in the present study are modelled with Solidworks 16.0. The fluid structure interaction analysis is a combination of ANSYS Fluent and ANSYS structural. These two are coupled with a system coupling in ANSYS workbench 16.0. To validate the numerical results an experimental work is carried out. The setup consists of a stainless steel reed valve taken from a Samsung model compressor which is attached to a fixed base. Air is taken as working medium and supplied to the valve for measuring the valve lift. The valve lift is measured with a strain gauge fitted on the valve near the fixed end. The results from both the experimental and numerical method are compared for 0.5 bar and the results are in good agreement. Various parameters like valve deflection, stress on valve, velocity vectors and pressure contours are plotted. Further the analysis is carried out for varying pressure from 4 bar to 7 bar. Also the material of the reed valve is changed to Sandvik Hiflexsteel which is known for its high fatigue strength and the corresponding results are plotted.
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