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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

Figures

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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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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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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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Instantaneous relative velocity contours
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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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Localized injected flow scrubbing velocity field near suction surface of blade

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