Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor

Detalhes bibliográficos
Autor(a) principal: Mattos, Vitor Cesar Nogueira
Data de Publicação: 2022
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/237249
Resumo: Supercritical carbon-dioxide centrifugal compressors are machines with high potential for use in power generation plants and in the oil industry as it achieves high thermal efficiency in the Brayton cycle and assist in oil production through the capture and storage of CO2 by the EOR (Enhanced Oil Recovery) method. In this regard, to increase the performance of these machines, a three-dimensional numerical simulation (CFD) coupled with an optimization method is investigated. As well known, one-dimensional modeling for vaneless-diffuser designs is not able to predict all important flow phenomena due to several geometric parameters. Therefore, the present work aims to use the methodology optimization-surrogate coupled with CFD to optimize nine geometric input variables related to a vaneless-diffuser channel to identify the influence of each parameter on the turbomachinery performance and its sources of loss. Three different objective functions are submitted to single-optimization: Maximize total-to-total polytropic efficiency, minimize total pressure loss coefficient or maximize static pressure recovery coefficient. A reliminary geometry is created using Ansys Vista CCD for the impeller and the vaneless-diffuser is modeled as a channel of parallel plates. The sensitivity analysis is conducted using the Morris Elementary Effects method and SS-ANOVA through the response surface generated by Gaussian Process regression. The optimization procedure is fulfilled by the NSGA-II method. The main conclusions indicate that the optimized geometries increased by 2.9% the total-to-total polytropic efficiency, reduced by 24.0% the total pressure loss coefficient and increased by 11.4% the static pressure recovery coefficient at the design point operational condition. Moreover, the optimal configuration found by the optimization procedure remains with higher performance even operating at the off-design point. The strategy adopted in the present work through a combination of one-dimensional turbomachinery design with three-dimensional parametric sensitivity analysis and CFD-optimization of a vaneless-diffusers is a powerful tool for sizing high-performance equipment.
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spelling Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressorOtimização paramétrica para projeto de alta performance de um difusor sem pás de compressor centrífugo de sCO2sCO2 centrifugal compressorOptimizationVaneless-diffuserCFDCompressor centrífugo de sCO2OtimizaçãoVaneless-diffuserSupercritical carbon-dioxide centrifugal compressors are machines with high potential for use in power generation plants and in the oil industry as it achieves high thermal efficiency in the Brayton cycle and assist in oil production through the capture and storage of CO2 by the EOR (Enhanced Oil Recovery) method. In this regard, to increase the performance of these machines, a three-dimensional numerical simulation (CFD) coupled with an optimization method is investigated. As well known, one-dimensional modeling for vaneless-diffuser designs is not able to predict all important flow phenomena due to several geometric parameters. Therefore, the present work aims to use the methodology optimization-surrogate coupled with CFD to optimize nine geometric input variables related to a vaneless-diffuser channel to identify the influence of each parameter on the turbomachinery performance and its sources of loss. Three different objective functions are submitted to single-optimization: Maximize total-to-total polytropic efficiency, minimize total pressure loss coefficient or maximize static pressure recovery coefficient. A reliminary geometry is created using Ansys Vista CCD for the impeller and the vaneless-diffuser is modeled as a channel of parallel plates. The sensitivity analysis is conducted using the Morris Elementary Effects method and SS-ANOVA through the response surface generated by Gaussian Process regression. The optimization procedure is fulfilled by the NSGA-II method. The main conclusions indicate that the optimized geometries increased by 2.9% the total-to-total polytropic efficiency, reduced by 24.0% the total pressure loss coefficient and increased by 11.4% the static pressure recovery coefficient at the design point operational condition. Moreover, the optimal configuration found by the optimization procedure remains with higher performance even operating at the off-design point. The strategy adopted in the present work through a combination of one-dimensional turbomachinery design with three-dimensional parametric sensitivity analysis and CFD-optimization of a vaneless-diffusers is a powerful tool for sizing high-performance equipment.OutraRCGI: 314137Universidade Estadual Paulista (Unesp)Salviano, Leandro OliveiraUniversidade Estadual Paulista (Unesp)Mattos, Vitor Cesar Nogueira2022-10-27T14:45:57Z2022-10-27T14:45:57Z2022-09-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/11449/23724933004099082P2enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESP2024-08-05T18:16:46Zoai:repositorio.unesp.br:11449/237249Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:16:46Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
Otimização paramétrica para projeto de alta performance de um difusor sem pás de compressor centrífugo de sCO2
title Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
spellingShingle Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
Mattos, Vitor Cesar Nogueira
sCO2 centrifugal compressor
Optimization
Vaneless-diffuser
CFD
Compressor centrífugo de sCO2
Otimização
Vaneless-diffuser
title_short Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
title_full Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
title_fullStr Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
title_full_unstemmed Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
title_sort Parametric optimization to design a high-performance vaneless-diffuser for sCO2 centrifugal compressor
author Mattos, Vitor Cesar Nogueira
author_facet Mattos, Vitor Cesar Nogueira
author_role author
dc.contributor.none.fl_str_mv Salviano, Leandro Oliveira
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Mattos, Vitor Cesar Nogueira
dc.subject.por.fl_str_mv sCO2 centrifugal compressor
Optimization
Vaneless-diffuser
CFD
Compressor centrífugo de sCO2
Otimização
Vaneless-diffuser
topic sCO2 centrifugal compressor
Optimization
Vaneless-diffuser
CFD
Compressor centrífugo de sCO2
Otimização
Vaneless-diffuser
description Supercritical carbon-dioxide centrifugal compressors are machines with high potential for use in power generation plants and in the oil industry as it achieves high thermal efficiency in the Brayton cycle and assist in oil production through the capture and storage of CO2 by the EOR (Enhanced Oil Recovery) method. In this regard, to increase the performance of these machines, a three-dimensional numerical simulation (CFD) coupled with an optimization method is investigated. As well known, one-dimensional modeling for vaneless-diffuser designs is not able to predict all important flow phenomena due to several geometric parameters. Therefore, the present work aims to use the methodology optimization-surrogate coupled with CFD to optimize nine geometric input variables related to a vaneless-diffuser channel to identify the influence of each parameter on the turbomachinery performance and its sources of loss. Three different objective functions are submitted to single-optimization: Maximize total-to-total polytropic efficiency, minimize total pressure loss coefficient or maximize static pressure recovery coefficient. A reliminary geometry is created using Ansys Vista CCD for the impeller and the vaneless-diffuser is modeled as a channel of parallel plates. The sensitivity analysis is conducted using the Morris Elementary Effects method and SS-ANOVA through the response surface generated by Gaussian Process regression. The optimization procedure is fulfilled by the NSGA-II method. The main conclusions indicate that the optimized geometries increased by 2.9% the total-to-total polytropic efficiency, reduced by 24.0% the total pressure loss coefficient and increased by 11.4% the static pressure recovery coefficient at the design point operational condition. Moreover, the optimal configuration found by the optimization procedure remains with higher performance even operating at the off-design point. The strategy adopted in the present work through a combination of one-dimensional turbomachinery design with three-dimensional parametric sensitivity analysis and CFD-optimization of a vaneless-diffusers is a powerful tool for sizing high-performance equipment.
publishDate 2022
dc.date.none.fl_str_mv 2022-10-27T14:45:57Z
2022-10-27T14:45:57Z
2022-09-02
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/11449/237249
33004099082P2
url http://hdl.handle.net/11449/237249
identifier_str_mv 33004099082P2
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.source.none.fl_str_mv reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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