Preliminary Study of a Centrifugal Compressor With Counter-Rotating Impellers: Design and Performances Study
Counter-rotating turbomachines have been widely studied as a promising way to enhance performances and handle off-design instabilities through rotational velocities modulation. Although many published research works can be found concerning axial counter-rotating turbomachines, there is only a very few works about centrifugal ones. In this paper, a preliminary design and performance analysis under certain constraints is made to check the applicability of counter-rotating impellers on centrifugal compressors. The design approach is based on 0D/1D models, velocity triangles and coupled with genetic optimization method in order to fulfill the design criteria. A comparison of the aerodynamic performances of this new configuration with a baseline standard configuration already built and tested in the laboratory, is made.
The counter-rotating stage consists of two successive centrifugal or mixed-flow impellers. These two impellers are separated by a typically narrow gap. The rear impeller is designed parametrically while taking into account the flow conditions at the outlet of the front-impeller.
During the optimization process, the performance of selected impellers is determined using a set of 0D/1D loss models validated by some available experimental data.
In conclusion, a selection of candidate solutions is analyzed using 3D CFD solver to choose the most exact configuration for manufacturing and experimentally testing.
Preliminary Study of a Centrifugal Compressor With Counter-Rotating Impellers: Design and Performances Study
Category
Technical Paper Publication
Description
Session: 36-06 Centrifugal Compressors III
ASME Paper Number: GT2020-15860
Start Time: September 24, 2020, 08:00 AM
Presenting Author: Cheikh Brahim ABED
Authors: Cheikh Brahim ABED Arts & Métiers ParisTech
Sofiane Khelladi Arts et Métiers ParisTech
Michaël Deligant Arts et Métiers ParisTech
Abdelatif Elmarjani Ecole Mohammadia d'ingénieurs
Farid BakirArts et Métiers ParisTech