Two Types Of Analytical Methods For A Centrifugal Compressor Impeller For Supercritical Co2Power Cycles

Abstract

The present study provides aerodynamic analysis of a centrifugal compressor impeller blade with supercritical carbon dioxide (sCO2) as the working fluid through a comparative study between three dimensional (3-D) computational fluid dynamics (CFD) and a one dimensional (1-D) mean-line analyses. The main centrifugal compressor in reference to a 100 MW sCO2closed loop Recuperated Recompression Brayton cycle is investigated. Considering modeling becomes increasingly complex with such an unconventional gas, a mean line analysis is selected as the starting point of this study. The boundary conditions are derived through the mean line analysis of the main centrifugal compressor with a pressure ratio and efficiency relative to the specified cycle. Through the use of loss correlations for centrifugal compressors within the literature search, and parameters found through the mean-line design, losses are calculated for the specified compressor impeller. Furthermore, the CFD study of the single centrifugal compressor impeller blade is performed with sCO2as the working fluid. Carbon dioxide is modeled as a compressible real gas with the application of a user defined equation of state (EOS). An EOS is established through a pressure and temperature dependent thermodynamic property table. Consequently, a better understanding is developed on best practices for modeling a real gas sCO2 centrifugal compressor within the commercial CFD solver, STAR-CCM+. Ultimately, the aerodynamic losses from the 1-D approach are evaluated by comparing with the ones derived from the CFD analysis.

Publication Date

1-1-2016

Publication Title

14th International Energy Conversion Engineering Conference, 2016

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2016-4526

Socpus ID

85086056507 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85086056507

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