Coexisting state of surge and rotating stall in a two-stage axial flow compressor using a double-phase-locked averaging technique

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• 作者：Yuu Sakata ; Yutaka Ohta
• 关键词：Axial flow compressor ; Rotating stall ; Surge ; Double ; phase ; locked measurement ; Compression wave
• 刊名：Journal of Thermal Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：26
• 期：1
• 页码：38-46
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Classical and Continuum Physics; Engineering Fluid Dynamics; Engineering Thermodynamics, Heat and Mass Transfer;
• 出版者：Science Press
• ISSN：1993-033X
• 卷排序：26

文摘

The interaction between surge and rotating stall in an axial flow compressor was investigated from the viewpoint of an unsteady inner flow structure. The aim of this study was to identify the key factor that determines the switching phenomenon of a surge cycle. The main feature of the tested compressor is a shock tube connected in series to the compressor outlet through a diaphragm, slits, and a concentric duplex pipe: this system allows surge and rotating stall to be generated by connecting the shock tube with the compressor, or enables the compression plane wave injection. The unsteady characteristics and the internal flow velocity fluctuations were measured in detail, and the stall cell structure was averaged and visualized along the movement of the operation point under a coexisting state of surge. A coefficient of the cell scale fluctuation was calculated using the result of the averaging, and it confirmed that the processes of inner flow structure change differed from each other according to the next cycle of the surge. The result suggests that the key factor that determines the next cycle is the transformation of the internal flow structure, particularly between the stall cell and the entire circumferential stall, in both the recovering and stalling processes.