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TECHNICAL PAPERS

Micro Air Injection and Its Unsteady Response in a Low-Speed Axial Compressor

[+] Author and Article Information
Chaoqun Nie, Gang Xu, Xiaobin Cheng, Jingyi Chen

Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, China

J. Turbomach 124(4), 572-579 (Nov 07, 2002) (8 pages) doi:10.1115/1.1508383 History: Received October 25, 2001; Online November 07, 2002
Copyright © 2002 by ASME
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References

Epstein,  A. H., Williams,  J. E., and Greitzer,  E. M., 1989, “Active Suppression of Aerodynamic Instabilities in Turbomachinery,” J. Propul. Power, 5(2), pp. 204–211.
Greitzer,  E. M., 1998, “Smart Jet Engines—Case History of a Multidisciplinary Research Program,” JSME Int. J. Series B,41 , No. 1.
Day,  I. J., 1993, “Active Suppression of Rotating Stall and Surge in Axial Compressors,” ASME J. Turbomach., 115, pp. 40–47.
Goto,  A., 1994, “Suppression of Mixed-Flow Pump Instability and Surge by the Active Alteration of Impeller Secondary Flows,” ASME J. Turbomach., 116, pp. 621–634.
Behnken, R. L., Leung, M., and Murray, R. M., 1997, “Characterizing the Effects of Air Injection on Compressor Performance for Use in Active Control of Rotating Stall,” ASME 97-GT-316.
Weigl,  H. J., Paduano,  J. D., Frechette,  L. G., Epstein,  A. H., Greitzer,  E. M., Bright,  M. M., and Strazisar,  A. J., 1998, “Active Stabilization of Rotating Stall and Surge in a Transonic Single Stage Axial Compressor,” ASME J. Turbomach., 120, pp. 625–636.
Suder, K. L., Hathaway, M. D., Thorp, S. A., Strazisar, A. J., and Bright, M. B., 2000, “Compressor Stability Enhancement using Discrete Tip Injection,” ASME 2000-GT-650.
Xu, G., Cheng, X., Nie, C., and Chen, J., 2001, “Unsteady Response to the Tip Injection in a Low-Speed Axial Compressor,” Proc., 5th ISAIF, Vol. 1, pp. 349–358, Gdansk, Poland.
Lin, F., Chen, J., and Li, M., 2001, “Experimental Investigation on Unsteady Rotor Tip Flows in a High Speed Compressor Throttled to Stall,” ASME 2002-GT-30360.
Hoying, D. A., Tan, C. S., Vo, H. D., and Greitzer, E. M., 1998, “Role of Blade Passage Flow Structures in Axial Compressor Rotating Stall Inception,” ASME 98-GT-588.
Cheng, X., Chen, J., and Nie, C., 1999, “Investigation on the Precursor Behavior of Compressor Rotating Stall through Two-Dimensional Wavelet Transform,” Proc. ICET, pp. 278–284, Beijing, China.

Figures

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Compressor performance with and without injection (including various amounts of injection)/0 deg injection, 2 mm radial penetration, 7 mm axial gap
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Compressor performance at different operating speed/0 deg injection, 2 mm radial penetration, 7 mm axial gap
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Various injection angles
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Compressor performance at various injection angles/2 mm radial penetration, 2 mm axial gap
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Compressor performance with different axial location of injectors/0 deg injection, 2 mm radial penetration
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Compressor performance with different radial penetration of injectors/0 deg injection, 2 mm axial gap
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Side view of compressor test rig
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Schematic of compressor rig, measurement and injection system
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Injector design (dimensions in mm)
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Position of injectors and pressure transducers
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Instantaneous relative velocity contours
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Localized injected flow scrubbing velocity field near suction surface of blade
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Compressor performance with circumferentially agglomerated injectors/0 deg injection, 2 mm radial penetration, 2 mm axial gap
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Pressure signals in the time domain at various circumferential locations with and without injection/2400 rpm
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Pressure spectra in the frequency domain before and after stall/2400 rpm, without injection
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Time-space image of pressure signals and image processing via 2-D wavelet transform/2400 rpm, without injection
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Image processing of pressure signals via 2-D wavelet transform/2400 rpm, different injection angles, 2 mm radial penetration, 2 mm axial gap—(a) −15 deg injection, (b) 0 deg injection, (c) +15 deg injection
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Computation geometry and grid points on the slipping plan between injector and rotor
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Three-dimensional view of traces of tip clearance vortex without injection
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Three-dimensional view of traces of tip clearance vortex with injection

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