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

• Autorzy: Cyklis P. , Hendla R.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

pressure pulsations modelling; real gas

PL

gaz rzeczywisty; modelowanie pulsacji ciśnieniowej

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2005
• Tom: Vol. 26, no. 3
• Strony: 21--35
• Opis fizyczny: Bibliogr. 7 poz., tab., rys.

Twórcy

autor

Cyklis P.

• Cracow University of Technology, Department of Thermodynamics and Thermal Machines Measurements, Faculty of Mechanical Engineering, 31-864 Kraków, Jana Pawła II 37, Poland

autor

Hendla R.

• Cracow University of Technology, Department of Thermodynamics and Thermal Machines Measurements, Faculty of Mechanical Engineering, 31-864 Kraków, Jana Pawła II 37, Poland

Bibliografia

• [1] LIU Z., SOEDEL W.: Using a gas model to predict the supercharging phenomenon in a variable speed compressor, International Compressor Engineering Conference at Purdue, West Lafayette, USA, 1994.
• [2] WINTERBONE D.E., PEARSON R.J.: A Solution of the wave equations using real gases, International Journal of Mechanical Sci., 34, 1992, No. 12.
• [3] RAIMONDI L.: A modified Redlich-Kwong equation of state for vapour-liquid equilibrium, calculation, Chemical Engineering Science, 35, 1980, 1269-1275.
• [4] HENDLA R.: The effect of the choice of equation of state on calculating the parameters of an acoustical muffler in a compressor manifold, PhD Thesis, Cracow University of Technology, 2003 (in Polish).
• [5] CYKLIS P.: A CFD based identification method of the transmittances for the pulsating gas installation element. Part I - Theory, Part II - Experimental, International Compressor Engineering Conference at Purdue, West Lafayette, USA, 2002.
• [6] CYKLIS P.: Experimental identification of the transmittance matrix for any element of the pulsating gas manifold, Journal of Sound and Vibration, 244, 2001, 859-870.
• [7] CYKLIS P.: Experimental identification of the generalized four-element transfer matrix for the pulsating gas installation element. Part I - Theory, Part II - Experiment, Inter. Compressor Eng. Conf. at Purdue, West Lafayette, USA, 2000.