Experimental Validation of the Aerodynamic Performance of an Innovative Counter-Rotating Centrifugal Compressor

Cheikh Brahim Abed, Sofiane Khelladi, Michael Deligant, Abdellatif El Marjani, Moisés Solis and Farid Bakir
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Cheikh Brahim Abed: Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, 151 Boulevard de l’Hôpital, 75013 Paris, France
Sofiane Khelladi: Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, 151 Boulevard de l’Hôpital, 75013 Paris, France
Michael Deligant: Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, 151 Boulevard de l’Hôpital, 75013 Paris, France
Abdellatif El Marjani: EMISys, E3S Research Center, Mohammadia School of Engineers, Mohammed V University in Rabat, Rabat BP 765, Morocco
Moisés Solis: Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, 151 Boulevard de l’Hôpital, 75013 Paris, France
Farid Bakir: Arts et Métiers Institute of Technology, CNAM, LIFSE, HESAM University, 151 Boulevard de l’Hôpital, 75013 Paris, France

Energies, 2021, vol. 14, issue 9, 1-21

Abstract: Turbomachinery with double counter-rotating impellers offers more degrees of freedom in the choice of design and control parameters compared to conventional machines. For these innovative machines, the literature review shows that more publications concerning axial type turbomachines are available than centrifugal ones. This work deals with a design and experimental performance analysis, applied to two counter-rotating impellers of a centrifugal compressor “CRCC”. CRCC was designed with a specifically developed tool based on mean-line approach coupled with optimization algorithms and a stream-curvature through-flow method to satisfy the design criteria. This paper presents an experimental validation of the CRCC design tool and its performances against the baseline “SR”, composed of one centrifugal impeller and a volute for which experimental data are available. CRCC numeric simulations are also validated by experimental data. For a fair comparison between CRCC and SR, the same volute is used for both configurations. The CRCC studied here includes a first conventional impeller with an axial inlet and a radial outlet, while the second impeller is parametrically designed and can be considered a rotating bladed diffuser with a radial inlet and outlet. The obtained results show that CRCC can deliver a pressure rise increase of two compared to SR, along with an increase of isentropic efficiency and also validate the design method of this novel layout. The experimental results also show that the speed ratio of CRCC has a positive effect on the surge and shock margin.

Keywords: aerodynamic; counter-rotating; centrifugal compressor; design validation; experimental; performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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