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1-D modelling of supersonic carbon dioxide two-phase flow through ejector motive nozzle.

Number: pap. n. R19, 2362

Author(s) : ANGIELCZYK W., SEYNHAEVE J. M., BUTRYMOWICZ D., et al.

Summary

A promising device which could help to reduce losses and improve efficiency of CO2 transcritical refrigeration cycle, is the ejector technology. However, modelling such a device is really challenging because not only the transcritical nature of the flow but also the occurrence of a choked flow rate, where thermodynamics equilibrium is a big issue. The two-phase critical flow of carbon dioxide through ejector motive nozzle is modelled by means of the homogeneous relaxation model (HRM). Existing closure laws for relaxation time were adapted for carbon dioxide. The pressure distribution along the nozzle is calculated for three different nozzle geometries and compared with an experimental data. The issue of the sound velocity is discussed in terms of differences between prediction accuracy of homogenous equilibrium model and HRM.

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Pages: 8 p.

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Details

  • Original title: 1-D modelling of supersonic carbon dioxide two-phase flow through ejector motive nozzle.
  • Record ID : 30000792
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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