A new approach, steady micro air injection from the casing, is proposed to improve the stability of a three-stage low-speed axial compression system. Although the injection rate is designated to be only a few ten thousandth of the compressor flow rate, such an injection is able to trigger the unsteady response and thus lower the mass flow rate at stall for up to 5.83%. At the same time, it keeps the steady compressor characteristic with no injection unchanged. In order to verify that the compressor response is indeed unsteady, experiments at various injection configurations are performed, which include different injection angles, axial gaps between injector and blade leading edge, radial penetration of injector and the amount of injected air. Evidences of the unsteady response are further demonstrated through dynamic signal analysis using a wavelet-based method to show the behavior of early flow disturbances under the influence of injection. Numerical analyses performed at near stall condition show that the tip clearance vortices do response to the micro-injection, and thus delay the inception of stall.
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October 2002
Technical Papers
Micro Air Injection and Its Unsteady Response in a Low-Speed Axial Compressor
Chaoqun Nie,
Chaoqun Nie
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
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Gang Xu,
Gang Xu
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
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Xiaobin Cheng,
Xiaobin Cheng
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
11
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Jingyi Chen
Jingyi Chen
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
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Chaoqun Nie
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
Gang Xu
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
Xiaobin Cheng
11
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
Jingyi Chen
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China
Contributed by the International Gas Turbine Institute and presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 3–6, 2002. Manuscript received by the IGTI, October 25, 2001. Paper No. 2002-GT-30361. Review Chair: E. Benvenuti.
J. Turbomach. Oct 2002, 124(4): 572-579 (8 pages)
Published Online: November 7, 2002
Article history
Received:
October 25, 2001
Online:
November 7, 2002
Citation
Nie , C., Xu , G., Cheng, X., and Chen, J. (November 7, 2002). "Micro Air Injection and Its Unsteady Response in a Low-Speed Axial Compressor ." ASME. J. Turbomach. October 2002; 124(4): 572–579. https://doi.org/10.1115/1.1508383
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