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research-article

CENTRIFUGAL COMPRESSOR DESIGN FOR NEAR-CRITICAL POINT APPLICATIONS

[+] 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@fmi.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:10.1115/1.4040691 History: Received June 25, 2018; Revised June 26, 2018

Abstract

The supercritical CO2 (sCO2) Brayton cycle has been attracting much attention to produce the electricity power, chiefly due to its higher thermal efficiency with the relatively lower temperature at the turbine inlet compared to other common energy conversion cycles. Centrifugal compressor operating conditions in the supercritical Brayton cycle are commonly set in vicinity of the critical point, owing to smaller compressibility factor and eventually lower compressor work. This paper investigates and compares different centrifugal compressor design methodologies in close proximity to the critical point and suggests the most accurate design procedure based on the findings. An in-house mean-line design code, which is based on the individual enthalpy loss models, is compared to stage efficiency correlation design methods. Moreover, modifications are introduced to the skin friction loss calculation to establish an accurate 1-D design methodology. Moreover, compressor performances are compared to the experimental measurements.

Copyright (c) 2018 by ASME
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