L'effet de la taille et du fluide actif sur la conception multi-objectifs des compresseurs centrifuges à grande vitesse

Translated title of the contribution: The Effect of Size and Working Fluid on the Multi-Objective Design of High-Speed Centrifugal Compressors

Andrea Giuffre, Piero Colonna, Matteo Pini*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The impact of size and working fluid on the efficiency, operating range, and axial thrust on bearings is examined for high-speed, oil-free centrifugal compressors. First, the development and validation of a reduced-order model based on scaling principles is documented. Then, the validated compressor model is used to generate design maps for stages operating with arbitrary fluid molecules, and characterized by different size. The results show that compressors operating with fluids made by heavy and complex molecules provide lower efficiency over the entire design space, if compared to their simple-molecule counterparts. However, compressors for complex-molecule fluids require lower rotational speed, and generate lower axial thrust on bearings, thus making them particularly suitable for small-scale applications. Furthermore, a decreasing value of the size parameter has a detrimental effect on the stage efficiency, as a result of manufacturing constraints. The results computed by the compressor model suggest that the efficiency penalty is more sensitive to variations of clearance gap than to surface finishing. Lastly, the reduced-order model has been used to perform a design exercise, i.e., the multi-objective optimization of the first compressor stage of the heat pump test rig being realized at Delft University of Technology. The key characteristics of the optimal compressor design has been compared to those derived from the design maps, to corroborate their validity. The optimal design has been extensively characterized by means of CFD, providing further evidence that efficient mini-compressors operating with organic fluids, and featuring pressure ratios up to five at off-design, are feasible.

Translated title of the contributionThe Effect of Size and Working Fluid on the Multi-Objective Design of High-Speed Centrifugal Compressors
Original languageFrench
Pages (from-to)43-56
Number of pages14
JournalInternational Journal of Refrigeration
Volume143
DOIs
Publication statusPublished - 2022

Keywords

  • Centrifugal compressors
  • Computational fluid dynamics (CFD)
  • Environmental control system (ECS)
  • Heat pumps
  • Multi-objective optimization
  • Working fluids

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