首页|Parametric optimization applied to design a high-performance vaneless-diffuser for CO_2 centrifugal compressor

Parametric optimization applied to design a high-performance vaneless-diffuser for CO_2 centrifugal compressor

扫码查看
Carbon-dioxide (CO2) centrifugal compressors are machines with high potential ofusage in power generation plants and oil industry as it achieves high thermalefficiency in the Brayton cycles and contributes to oil production through thecapture and storage of CO_2 (CCS) in EOR (Enhanced Oil Recovery) systems. Highlevels of static pressure at the outlet are desired for EOR applications, which areusually obtained through the insertion of vanes in the diffuser. This work intends toincrease vaneless-diffuser static pressure recovery by modifying only its meridionalprofile, ensuring a broader range of off-design operation when compared to vaneddiffusers and attending to the fluctuations of mass flow and rotation expected inEOR practical applications. Therefore, a parametric optimization through surrogatemodel coupled to CFD was performed with three different objective functions thatwere submitted to single-optimization through the NSGA-II method: Maximizetotal-to-total polytropic efficiency, minimize total pressure loss coefficient or maximizestatic pressure recovery coefficient. Additionally, a sensitivity analysis wasconducted using Morris Elementary Effects and SS-ANOVA. The results indicatedthat the optimized geometries increased the total-to-total polytropic efficiency by2.9%, reduced the total pressure loss coefficient by 24.0% and increased the staticpressure recovery coefficient at the design point by 11.4%, which is discussed indetail after a careful phenomenology assessment. The strategy adopted in thepresent work through a combination of Sensitivity Analysis, surrogate models andCFD increased the vaneless-diffuser static pressure recovery without the need ofinserting vanes in the diffuser, which avoid instabilities in the equipment andwould restrict its range of off-design operation.

Carbon captureUtilization and StorageCO2 centrifugal compressovaneless-diffuseroptimizationsensitivity analysis

Eloy Gasparin、Vitor Mattos、Fabio Saltara、Paulo Eduardo Mello、Daniel Dezan、Jurandir Yanagihara、Leandro Salviano

展开 >

Department of Mechanical Engineering, São Paulo State University, Ilha Solteira – SP, Brazil

School of Engineering,University of São Paulo, São Paulo - SP, Brazil

Av. dos Estados, Federal University of ABC, Santo Andre - SP, Brazil

2024

Energy sources, Part A. Recovery, utilization, and environmental effects
  • 40