LAPSE:2023.6874
Published Article
LAPSE:2023.6874
Performance Improvement of a Highly Loaded Transonic Centrifugal Compressor with Tandem Impeller and Freeform Blade Configuration
Ziliang Li, Yanhui Wu, Xingen Lu
February 24, 2023
A highly loaded transonic centrifugal compressor is aerodynamically designed and numerically investigated. The objectives are to improve the compressor efficiency by using tandem impeller configuration and 3D free-formed blade design concepts. This approach has the potential to control both the transonic and distorted flows within impeller passages. The results suggest that employing the tandem impeller configuration can significantly improve the compressor efficiency by 1.4%. The efficiency gain is mainly contributed by the improved uniformity of the impeller discharge flow achieved when the newly generated inducer-shed vortices rearrange the secondary flow pattern. In addition, the location of the impeller passage shock moves downstream due to the potential effect within the tandem impeller and locally changes the back pressure of the inducer. These factors mitigate flow losses in the impeller and diffuser. Furthermore, the 3D design concepts of forward blade sweep and negative lean are employed in the tandem impeller configuration. The forward sweep design of the inducer weakens flow acceleration before the passage shock, and the negative lean design optimizes the secondary flow pattern, which yield an additional compressor efficiency improvement of 0.7%. The study conducted in this paper provides a valuable reference for future advanced transonic centrifugal compressor designs.
Keywords
design method, flow control, free-formed blade, highly-loaded centrifugal compressor, tandem impeller
Suggested Citation
Li Z, Wu Y, Lu X. Performance Improvement of a Highly Loaded Transonic Centrifugal Compressor with Tandem Impeller and Freeform Blade Configuration. (2023). LAPSE:2023.6874
Author Affiliations
Li Z: School of Power and Energy, Northwestern Polytechnical University, Xian 710072, China
Wu Y: School of Power and Energy, Northwestern Polytechnical University, Xian 710072, China
Lu X: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Journal Name
Energies
Volume
15
Issue
24
First Page
9283
Year
2022
Publication Date
2022-12-07
Published Version
ISSN
1996-1073
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PII: en15249283, Publication Type: Journal Article
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doi:10.3390/en15249283
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