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Investigation of the Carbon Dioxide Centrifugal Compressor Working Process using Computational Fluid Dynamics Methods

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Bibliographic Details
Title: Investigation of the Carbon Dioxide Centrifugal Compressor Working Process using Computational Fluid Dynamics Methods
Authors: Fateeva E.S., Danilishin A.M., Kozhukhov Y.V., Kazantsev R.A.
Source: Problems of the Regional Energetics, Vol 67, Iss 3, Pp 109-124 (2025)
Publisher Information: Technical University of Moldova, 2025.
Publication Year: 2025
Subject Terms: TK1001-1841, thermodynamic properties, carbon dioxide, TJ807-830, power plants, Renewable energy sources, TK1-9971, Production of electric energy or power. Powerplants. Central stations, real gas, efficiency, refrigeration systems, computational fluid dynamics (cfd), Electrical engineering. Electronics. Nuclear engineering, centrifugal compressor
Description: The article investigates the carbon dioxide (CO₂) centrifugal compressor using computational fluid dynamics (CFD). CO₂ centrifugal compressors are used in refrigeration and cryogenic systems, power plants with subcritical and transcritical cycles, including Brayton cycle. This work is a part of a re-search effort aimed at developing a methodology for calculating the gas-dynamic characteristics of centrifugal compressor stages in refrigeration systems. The main objectives of the research are to investigate the three-dimensional viscous flow parameters of carbon dioxide in the centrifugal com-pressor flow path using CFD and to compare two approaches of taking into account the reality of gas during modeling comparison. Key tasks included: centrifugal compressor CFD model replicating an experimentally tested compressor geometry and operation, comparing simulated outputs against ex-perimental data, total-to-total isentropic efficiency calculation.Two real-gas modeling approaches were evaluated: Ansys CFX’s built-in real gas models and external tables of CO₂ properties. The most significant results are the describing the features of the carbon dioxide centrifugal compressor working process using both the built-in real gas models in Ansys CFX and imported tables of real gas properties and the demonstration of satisfactory agreement between simulation and experiment. The significance of the obtained results lies in increasing the efficiency of carbon dioxide centrifugal compressors in process units of refrigerating, cryogenic and power systems. Compressors efficiency improvement is provided by developed recommendations application for performance of working process CFD-modeling considering peculiarities of carbon dioxide in subcritical state in design calcu-lations.
Document Type: Article
ISSN: 1857-0070
DOI: 10.52254/1857-0070.2025.3-67.10
Access URL: https://doaj.org/article/977ee35f4a854e64be7ee0be9421b953
Accession Number: edsair.doi.dedup.....985e74de5c332ef78fd99aaa1987a23e
Database: OpenAIRE
Description
Abstract:The article investigates the carbon dioxide (CO₂) centrifugal compressor using computational fluid dynamics (CFD). CO₂ centrifugal compressors are used in refrigeration and cryogenic systems, power plants with subcritical and transcritical cycles, including Brayton cycle. This work is a part of a re-search effort aimed at developing a methodology for calculating the gas-dynamic characteristics of centrifugal compressor stages in refrigeration systems. The main objectives of the research are to investigate the three-dimensional viscous flow parameters of carbon dioxide in the centrifugal com-pressor flow path using CFD and to compare two approaches of taking into account the reality of gas during modeling comparison. Key tasks included: centrifugal compressor CFD model replicating an experimentally tested compressor geometry and operation, comparing simulated outputs against ex-perimental data, total-to-total isentropic efficiency calculation.Two real-gas modeling approaches were evaluated: Ansys CFX’s built-in real gas models and external tables of CO₂ properties. The most significant results are the describing the features of the carbon dioxide centrifugal compressor working process using both the built-in real gas models in Ansys CFX and imported tables of real gas properties and the demonstration of satisfactory agreement between simulation and experiment. The significance of the obtained results lies in increasing the efficiency of carbon dioxide centrifugal compressors in process units of refrigerating, cryogenic and power systems. Compressors efficiency improvement is provided by developed recommendations application for performance of working process CFD-modeling considering peculiarities of carbon dioxide in subcritical state in design calcu-lations.
ISSN:18570070
DOI:10.52254/1857-0070.2025.3-67.10