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Modal Analysis of Axial Compressor Tip Rotating Instability under Varying Operating Conditions

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  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Engineering Research Centre of Gas Turbine and Civil Aero Engine, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China

网络出版日期: 2023-11-11

基金资助

This work was supported by Natural Science Foundation of Shanghai (Grant No. 18ZR1418600) and National Natural Science Foundation of China (Grant No. 11202132).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Modal Analysis of Axial Compressor Tip Rotating Instability under Varying Operating Conditions

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  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Engineering Research Centre of Gas Turbine and Civil Aero Engine, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China

Online published: 2023-11-11

Supported by

This work was supported by Natural Science Foundation of Shanghai (Grant No. 18ZR1418600) and National Natural Science Foundation of China (Grant No. 11202132).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

本文对低速压气机转子进行了全流道数值模拟,以研究叶尖区域的旋转不稳定性。结果的频谱分析表明在一定的稳定工作范围内存在旋转不稳定性现象。随着流量降低,在瞬时流场中可以发现31个流动扰动单元。涡流分布结果表明,叶尖泄漏涡流与相邻叶片之间相互作用的周向传播导致了这些扰动单元。应用动模态分解(DMD)和空间离散傅立叶变换(SDFT)获得了周向模态特征,结果表明旋转不稳定性与31个单元的流动扰动有关。将DMD方法进一步应用于全流道压力数据,以提取具有相应空间结构、频率和振幅的不同模态分量。结果表明,DMD方法可以显示叶顶流场中的流动特征,并探究叶顶流场中每个不稳定源的演化规律。

本文引用格式

LI Tao, WU Yadong, TIAN Jie, OUYANG Hua . Modal Analysis of Axial Compressor Tip Rotating Instability under Varying Operating Conditions[J]. 热科学学报, 2023 , 32(4) : 1345 -1356 . DOI: 10.1007/s11630-023-1830-y

Abstract

The full annulus numerical research was performed on a low-speed compressor rotor to investigate the rotating instability in the tip region. The frequency spectra show the existence of rotating instability at narrow stable operating range. With the decrease of flow rate, 31 cells of flow disturbance can be found in the instantaneous flow field. The distribution of vortex suggests that the circumferential propagation of the interaction between tip leakage vortex and adjacent blade brings about these cells. The dynamic mode decomposition (DMD) method and spatial discrete Fourier transform (SDFT) were applied to obtain the circumferential mode features, and the results indicate that the rotating instability is associated with the 31 cells of flow disturbance. Then the DMD method was further applied on the pressure data from a circle and an annulus domain, so as to extract different mode components with the corresponding spatial structures, frequencies and amplitudes. The results suggest that DMD modes can display the flow feature and explore the evolution of each instability source in the tip flow field.

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