A4 Conference proceedings

Effects of Real Gas Model Accuracy and Operating Conditions on Supercritical CO2 Compressor Performance and Flow Field


Publication Details
Authors: Ameli Alireza, Afzalifar Ali, Turunen-Saaresti Teemu, Backman Jari
Publication year: 2017
Language: English
Related Journal or Series Information: ASME Turbo Expo
Title of parent publication: Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
Volume number: 9
ISBN: 978-0-7918-5096-1
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

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.


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Last updated on 2018-19-10 at 07:55