Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves
Flow separation, which often occurs at the junction of blades and endwalls and seriously limits the aerodynamic performance of turbomachinery, is caused mainly by the boundary layer mixing on the blades and endwall surfaces and the transverse secondary flow. Focusing on a linear diffusion cascade wi...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-09-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/21/10/928 |
| _version_ | 1828118186141155328 |
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| author | Weilin Yi Lucheng Ji |
| author_facet | Weilin Yi Lucheng Ji |
| author_sort | Weilin Yi |
| collection | DOAJ |
| description | Flow separation, which often occurs at the junction of blades and endwalls and seriously limits the aerodynamic performance of turbomachinery, is caused mainly by the boundary layer mixing on the blades and endwall surfaces and the transverse secondary flow. Focusing on a linear diffusion cascade with 42° turning angle, the transverse secondary flow is found to be the dominant factor for flow separation, based on detailed analysis. Therefore, controlling the secondary flow to reduce the flow separation is very important. Based on the investigations, the flow separation can be controlled by cutting off the secondary flow. Therefore, nine kinds of streamwise grooves were designed and analyzed herein. Grooves at the endwall substantially inhibited the transverse secondary flow, but the flow structure varied over different spans. An optimum combination of groove width and height was identified, with the height being more important. A detailed flow analysis of the best scheme (with a smaller width and moderate height) was conducted. The loss reduction mechanism was obtained by 3D flow field and entropy analysis. This configuration can reduce the corner zone separation effect, energy loss coefficient, and flow loss. |
| first_indexed | 2024-04-11T13:26:58Z |
| format | Article |
| id | doaj.art-a7e530a7187d4104b631f06b8bdaef16 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T13:26:58Z |
| publishDate | 2019-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-a7e530a7187d4104b631f06b8bdaef162022-12-22T04:22:02ZengMDPI AGEntropy1099-43002019-09-01211092810.3390/e21100928e21100928Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise GroovesWeilin Yi0Lucheng Ji1School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100811, ChinaSchool of Aerospace Engineering, Beijing Institute of Technology, Beijing 100811, ChinaFlow separation, which often occurs at the junction of blades and endwalls and seriously limits the aerodynamic performance of turbomachinery, is caused mainly by the boundary layer mixing on the blades and endwall surfaces and the transverse secondary flow. Focusing on a linear diffusion cascade with 42° turning angle, the transverse secondary flow is found to be the dominant factor for flow separation, based on detailed analysis. Therefore, controlling the secondary flow to reduce the flow separation is very important. Based on the investigations, the flow separation can be controlled by cutting off the secondary flow. Therefore, nine kinds of streamwise grooves were designed and analyzed herein. Grooves at the endwall substantially inhibited the transverse secondary flow, but the flow structure varied over different spans. An optimum combination of groove width and height was identified, with the height being more important. A detailed flow analysis of the best scheme (with a smaller width and moderate height) was conducted. The loss reduction mechanism was obtained by 3D flow field and entropy analysis. This configuration can reduce the corner zone separation effect, energy loss coefficient, and flow loss.https://www.mdpi.com/1099-4300/21/10/928flow separationstreamwise groovescascadesecondary flowentropy analysis |
| spellingShingle | Weilin Yi Lucheng Ji Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves Entropy flow separation streamwise grooves cascade secondary flow entropy analysis |
| title | Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves |
| title_full | Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves |
| title_fullStr | Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves |
| title_full_unstemmed | Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves |
| title_short | Control and Entropy Analysis of Corner Flow Separation in a Compressor Cascade Using Streamwise Grooves |
| title_sort | control and entropy analysis of corner flow separation in a compressor cascade using streamwise grooves |
| topic | flow separation streamwise grooves cascade secondary flow entropy analysis |
| url | https://www.mdpi.com/1099-4300/21/10/928 |
| work_keys_str_mv | AT weilinyi controlandentropyanalysisofcornerflowseparationinacompressorcascadeusingstreamwisegrooves AT luchengji controlandentropyanalysisofcornerflowseparationinacompressorcascadeusingstreamwisegrooves |