基于因果网络分析的扩压叶栅波浪形前缘控制机理

doi:10.7527/S1000-6893.2023.28336

Abstract

Abstract:

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 diffuser 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 perspective， 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.

Key words: compressor, separation and vortex motion, wavy leading-edge, multi-objective optimization, causal network analysis

CLC Number:

V231.3

Jiezhong DONG, Wuli CHU, Haoguang ZHANG, Bo LUO, Song YAN. Flow control mechanism of diffuser cascade with wavy leading⁃edge based on causal network analysis[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(19): 128336-128336.

Figures/Tables 24

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参数	数值
叶高h/mm	200
弦长C/mm	114.3
轴向弦长C_x /mm	107
叶距s/mm	53.4
几何进口角β₁_k /（°）	52
几何出口角β₂_k /（°）	12
安装角γ/（°）	20.5
设计攻角i/（°）	-1

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Flow control mechanism of diffuser cascade with wavy leading⁃edge based on causal network analysis

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