摘要
Separation and vortex motion are key factors limiting the performance improvement of compressors,while the wavy leading-edge can effectively expand the working range of the compressor. This study implements the wavy leading-edge shape on the diffuser cascade,and uses a multi-objective optimization algorithm to construct a wavy leading-edge that significantly reduces the stall point loss at the expense of minimum design point performance. A data mining method,causal network analysis,is used to investigate the flow mechanism of the internal flow field of the dif⁃ fuser cascade with variation in the wavy leading-edge control parameters. The optimization results show that the strength of the leading-edge vortex pairs increases as the amplitude-wave ratio decreases,and that the stall point loss can be significantly reduced at the expense of minimum design point performance with the amplitude-wave ratio range within 0. 05⁃0. 15. The causal network model and flow field analysis verify that,from the vortex motion perspective,the wavy leading-edge generates leading-edge vortex pairs,and the development of the leading-edge vortex pairs weakens that of the channel vortex and trailing-edge vortex flow through different ways;from the separation perspec⁃ tive,the wavy leading-edge weakens the loss caused by the corner region separation by changing the leading-edge airflow inhomogeneity and secondary flow energy and improving the low-energy fluid blockage.
投稿的翻译标题 | Flow control mechanism of diffuser cascade with wavy leading⁃edge based on causal network analysis |
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源语言 | 繁体中文 |
文章编号 | 128336 |
期刊 | Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica |
卷 | 44 |
期 | 19 |
DOI | |
出版状态 | 已出版 - 15 10月 2023 |
关键词
- causal network analysis
- compressor
- multi-objective optimization
- separation and vortex motion
- wavy leading-edge