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Experimental Investigation of Diffuser Hub Injection to Improve Centrifugal Compressor Stability

Experimental Investigation of Diffuser Hub Injection to Improve Centrifugal Compressor Stability


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About the Book

Results from a series of experiments to investigate whether centrifugal compressor stability could be improved by injecting air through the diffuser hub surface are reported. The research was conducted in a 4:1 pressure ratio centrifugal compressor configured with a vane-island diffuser. Injector nozzles were located just upstream of the leading edge of the diffuser vanes. Nozzle orientations were set to produce injected streams angled at 8, 0 and +8 degrees relative to the vane mean camber line. Several injection flow rates were tested using both an external air supply and recirculation from the diffuser exit. Compressor flow range did not improve at any injection flow rate that was tested. Compressor flow range did improve slightly at zero injection due to the flow resistance created by injector openings on the hub surface. Leading edge loading and semi-vaneless space diffusion showed trends similar to those reported earlier from shroud surface experiments that did improve compressor flow range. Opposite trends are seen for hub injection cases where compressor flow range decreased. The hub injection data further explain the range improvement provided by shroud-side injection and suggest that different hub-side techniques may produce range improvement in centrifugal compressors. Skoch, Gary J. Glenn Research Center NASA/TM-2004-213182, ARL-TR-3158, GT2004-53618, E-14677


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Product Details
  • ISBN-13: 9781721676873
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 216 mm
  • ISBN-10: 1721676872
  • Publisher Date: 21 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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