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Influence of real gas model on the simulation of pressure pulsation in the reciprocating compressor manifolds

Cyklis P., Hendla R.

Archives of Thermodynamics

2005

Vol. 26, no. 3

21-35

Pressure pulsations in positive-displacement gas compressor manifolds have significant effect on the functioning of the entire manifold. In practical modelling of the pressure pulsations the ideal gas model is usually used. Although in many cases sufficient, this approach often does not allow to reach the required accuracy. Especially in the case of media with complicated molecular structures, high pressures and high temperatures. In this paper a comparison between different gas models for the real working medium pulsating flow is shown. The effects of the equation of state on the modelling accuracy is described in detail, and theoretically determined diagrams of the errors of the compressibility coefficient [o'] in certain areas of thermodynamic parameters are shown. Theoretical discussion is correlated with the results of CFD simulations of the oil separator (compressor manifold element) model, and with the experimental data.As the effect, differences in the results obtained for particular gas models are shown. Presented analysis shows, that the relatively most effective means of analysing pressure pulsations, using the CFD methods, is the application of the empirical equation of state for the carefully averaged value of the coefficient of compressibility.