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1
Content available remote Influence of real gas model on the simulation of pressure pulsation in the reciprocating compressor manifolds
Cyklis P., Hendla R.
Archives of Thermodynamics
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2005
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Vol. 26, no. 3
21-35
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.
2
Wpływ doboru równania stanu na wysiłki symulacji komputerowej przepływu czynnika przez element instalacji chłodniczej
Cyklis P., Hendla R.
Prace Naukowe Politechniki Warszawskiej. Konferencje
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2002
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T. 1, z. 22
259-266
PL
Aktualny rozwój metod modelowania komputerowego CFD (Computational Fluid Dynamics) umożliwia pełną analizę pracy urządzeń wchodzących w skład instalacji gazu rzeczywistego takich jak układy pomiarowe czy odolejacze. W pracy przedstawiono symulację przepływu czynnika gazowego dla różnych modeli gazu przez odolejacz układu chłodniczego. Wprowadzono trzy modele czynnika: gaz doskonały, empiryczne równanie stanu oraz bibliotekę NIST dokładnie oddająca stan czynnika chłodniczego. Symulację przeprowadzono za pomocą programu PHOENICS. W pracy wyniki zostały przedstawione w formie rozkładów przestrzennych i wielkości globalnych. Porównano wyniki i przedstawiono wnioski określające granice zastosowań przedstawionych modeli.
EN
Current development of computer modeling CFD (Computational Fluid Dynamics) makes possible full analysis of the real gas flow inside elements of the installation. Those elements are for example oil removers or flow meters. In this paper the simulations of the gas flow through the oil remover in the refrigerating installation using three gas models have been shown. The ideal gas, empirical gas model and NIST library results have been compared. The simulations have been done using PHOENICS software. The flow parameters distribution have been shown. Also the solution for the non stationary impulse excitation has been shown.
3
Content available remote Symulacja CFD zwężkowego pomiaru przepływu płynu - porównanie programów FLUENT, PHOENICS
Hendla R., Kantor R.
Czasopismo Techniczne. Mechanika
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2001
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R. 98, z. 5-M
95--104
EN
In this paper the simulation of the orifice flow using PHOENICS and FLUENT CFD programs has been shown. The velocity has been given as inlet boundary condition and the pressure difference on the orifice has been calculated. The main aim of the presented simulation was to compare computed results with normalised values. The pressure distribution and velocity vectors shows better results obtained using FLUENT.
4
Content available remote Problem testowy w zagadnieniach przepływu płynu dla programu PHOENICS
Hendla R.
Czasopismo Techniczne. Mechanika
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2001
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R. 98, z. 2-M
135--145
EN
In the paper an benchmark test for the CFD PHOENICS program has been presented. Test problem analysed consistd of normalised orifice measuring system with connecting pipes. The inlet velocity of the air has been given and the pressure difference before and after the orifice plate has been calculated. The main aim of the presented simulation was to find out how accurate the computed results may be in comparison with the data calculated according to PN-93/M/53950/01. The precision of calculated values depending of a grid arrangement and used solver method has been shown. The shapes of p(m) functions, bars of mass flow and finally a calculation time have been shown
5
Content available remote Analiza pracy przepływomierza zwężkowego w warunkach przepływu pulsującego za pomocą symulacji CFD
Cyklis P., Hendla R.
Czasopismo Techniczne. Mechanika
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2001
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R. 98, z. 5-M
53--60
EN
In this paper the analysis of the influence of flow pulsation on results of average flow measurements using normalized orifice and nozzle. The investigation has been done using the CFD simulation program PHOENICS. It has been assumed that the pressure difference meter is ideal, without any inertia effect. It has been shown that measured pressure difference corresponds with lower man flow rate, than the real value.
6
Content available remote Analiza nieustalonego przepływu gazu w elemencie akustycznym sprężarki tłokowej
Cyklis P., Hendla R.
Czasopismo Techniczne. Mechanika
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1999
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R. 96, z. 2-M
49--62
EN
In the paper a CFD analysis of the pulsating gas flow in the compressor oil separator has been presented. Analysed compressor oil separator is a part of the high power methane compressor gas installation, and the pressure pulsations in there are the cause of strong vibrations. The main aim of the present simulation was to determine, on the basic of three dimensional calculations, the acoustical response of the oil separator. The main acoustical parameters on the basis of which the impedance matrix elements will be in future determined are the response time and the shape of p(tau) and w(tau) functions.
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