0
research-article

EFFECTS OF REAL GAS MODEL ACCURACY AND OPERATING CONDITIONS ON SUPERCRITICAL CO2 COMPRESSOR PERFORMANCE AND FLOW FIELD

[+] Author and Article Information
Alireza Ameli

Laboratory of Fluid Dynamics, School of Energy Systems, Lappeenranta University of Technology, Lappeenranta 53850, Finland
alireza.ameli@lut.fi

Ali Afzalifar

Laboratory of Fluid Dynamics, School of Energy Systems, Lappeenranta University of Technology, Lappeenranta 53850, Finland
ali.afzalifar@lut.fi

Teemu Turunen-Saaresti

Laboratory of Fluid Dynamics, School of Energy Systems, Lappeenranta University of Technology, Lappeenranta 53850, Finland
teemu.turunen-saaresti@lut.fi

Jari Backman

Laboratory of Fluid Dynamics, School of Energy Systems, Lappeenranta University of Technology, Lappeenranta 53850, Finland
jari.backman@lut.fi

1Corresponding author.

ASME doi:10.1115/1.4038552 History: Received September 22, 2017; Revised October 03, 2017

Abstract

Rankine and Brayton cycles are common energy conversion cycles and constitute the basis of a significant proportion of global electricity production. Even a seemingly marginal improvement in the efficiency of these cycles can considerably decrease the annual use of primary energy sources and bring a significant gain in power plant output. Recently, supercritical Brayton cycles using CO2 as the working fluid have attracted much attention, chiefly due to their high efficiency. As with conventional cycles, improving the compressor performance in supercritical cycles is major route to increasing the efficiency of the whole process. This paper numerically investigates the flow field and performance of a supercritical CO2 centrifugal compressor. A thermodynamic look-up table is coupled with the flow solver and the look-up table is systematically refined to take into account the large variation of thermodynamic properties in the vicinity of the critical point. Effects of different boundary and operating conditions are also discussed. It is shown that the compressor performance is highly sensitive to the look-up table resolution as well as the operating and boundary conditions near the critical point. Additionally, a method to overcome the difficulties of simulation close to the critical point is explained.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In