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Experimental investigations of micro air injection to control rotating stall

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Abstract

Steady discrete micro air injection at the tip region in front of the first compressor rotor has been proved to be an effective method to delay the inception of rotating stall in a low speed axial compressor. Considering the practical application a new type of micro injector was designed and described in this paper, which was imbedded in the casing and could be moved along the chord. In order to verify its feasibility to other cases, such as high subsonic axial compressor or centrifugal compressor, some other cases have been studied. Experimental results of the same low speed axial compressor showed that the new injector could possess many other advantages besides successfully stabilizing the compressor. Experiments performed on a high subsonic axial compressor confirmed the effectiveness of micro air injection when the relative velocity at the blade tip is high subsonic. Meanwhile in order to explore its feasibility in centrifugal compressor, a similar micro injector was designed and tested on a low speed centrifugal compressor with vaned diffuser. The injected mass flow was a bit larger than that used in axial compressors and the results showed micro injection could also delay the onset of rotating stall in the centrifugal compressor.

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Authors and Affiliations

  1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing, 10080, China

    Chaoqun Nie (Professor), Zhiting Tong, Shaojuan Geng, Junqiang Zhu & Weiguang Huang

  2. Graduate School of the Chinese Academy of Sciences, China

    Zhiting Tong & Shaojuan Geng

Authors
  1. Chaoqun Nie
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  2. Zhiting Tong
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  3. Shaojuan Geng
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  4. Junqiang Zhu
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  5. Weiguang Huang
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Nie, C., Tong, Z., Geng, S. et al. Experimental investigations of micro air injection to control rotating stall. J. of Therm. Sci. 16, 1–6 (2007). https://doi.org/10.1007/s11630-007-0001-x

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  • DOI: https://doi.org/10.1007/s11630-007-0001-x

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