Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor
In the current study, full-stage unsteady simulations were performed to investigate rotating instability inception mechanisms in a particularly large tip clearance centrifugal compressor with a vaneless diffuser and a volute. Four operating points along a speed line were analysed to understand the i...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | International Journal of Turbomachinery, Propulsion and Power |
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| Online Access: | https://www.mdpi.com/2504-186X/8/3/25 |
| _version_ | 1797579604275232768 |
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| author | Xavier Flete Nicolas Binder Yannick Bousquet Sandrine Cros |
| author_facet | Xavier Flete Nicolas Binder Yannick Bousquet Sandrine Cros |
| author_sort | Xavier Flete |
| collection | DOAJ |
| description | In the current study, full-stage unsteady simulations were performed to investigate rotating instability inception mechanisms in a particularly large tip clearance centrifugal compressor with a vaneless diffuser and a volute. Four operating points along a speed line were analysed to understand the influence of the mass flow reduction on flow structures. Close to the peak efficiency, an unsteady interaction between the tip clearance vortices and splitter blades was observed. Considering other studies, the influence of the tip gap size was analysed. Then, a large-scale vortex shedding from the leading edges of the main blades was detected when the stage operated near the maximum pressure ratio. It was demonstrated that shed vortices were caused by the combination of the radial gradient of the tangential velocity under the tip vortex and the reverse backflow near the casing. Previous studies on axial compressors refer to these vortical structures as backflow vortices. These vortices cause a significant increase in the incidence angle in the tip region. |
| first_indexed | 2024-03-10T22:38:32Z |
| format | Article |
| id | doaj.art-ba17ca11eb1c4c44ad4ec2d039cec46d |
| institution | Directory Open Access Journal |
| issn | 2504-186X |
| language | English |
| last_indexed | 2024-03-10T22:38:32Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Turbomachinery, Propulsion and Power |
| spelling | doaj.art-ba17ca11eb1c4c44ad4ec2d039cec46d2023-11-19T11:13:03ZengMDPI AGInternational Journal of Turbomachinery, Propulsion and Power2504-186X2023-08-01832510.3390/ijtpp8030025Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal CompressorXavier Flete0Nicolas Binder1Yannick Bousquet2Sandrine Cros3Liebherr-Aerospace Toulouse SAS, 408 Avenue des Etats Unis, 31016 Toulouse, FranceISAE-SUPAERO, 10 Av. Edouard Belin, 31400 Toulouse, FranceISAE-SUPAERO, 10 Av. Edouard Belin, 31400 Toulouse, FranceLiebherr-Aerospace Toulouse SAS, 408 Avenue des Etats Unis, 31016 Toulouse, FranceIn the current study, full-stage unsteady simulations were performed to investigate rotating instability inception mechanisms in a particularly large tip clearance centrifugal compressor with a vaneless diffuser and a volute. Four operating points along a speed line were analysed to understand the influence of the mass flow reduction on flow structures. Close to the peak efficiency, an unsteady interaction between the tip clearance vortices and splitter blades was observed. Considering other studies, the influence of the tip gap size was analysed. Then, a large-scale vortex shedding from the leading edges of the main blades was detected when the stage operated near the maximum pressure ratio. It was demonstrated that shed vortices were caused by the combination of the radial gradient of the tangential velocity under the tip vortex and the reverse backflow near the casing. Previous studies on axial compressors refer to these vortical structures as backflow vortices. These vortices cause a significant increase in the incidence angle in the tip region.https://www.mdpi.com/2504-186X/8/3/25backflow vorticescentrifugal compressorrotating instabilitytip leakage flowwide tip clearance |
| spellingShingle | Xavier Flete Nicolas Binder Yannick Bousquet Sandrine Cros Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor International Journal of Turbomachinery, Propulsion and Power backflow vortices centrifugal compressor rotating instability tip leakage flow wide tip clearance |
| title | Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor |
| title_full | Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor |
| title_fullStr | Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor |
| title_full_unstemmed | Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor |
| title_short | Numerical Investigation of Rotating Instability Development in a Wide Tip Gap Centrifugal Compressor |
| title_sort | numerical investigation of rotating instability development in a wide tip gap centrifugal compressor |
| topic | backflow vortices centrifugal compressor rotating instability tip leakage flow wide tip clearance |
| url | https://www.mdpi.com/2504-186X/8/3/25 |
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