Gas turbine combustion instability

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Description

Combustion oscillations are a common problem in development of LPM (lean premix) combustors. Unlike earlier, diffusion style combustors, LPM combustors are especially susceptible to oscillations because acoustic losses are smaller and operation near lean blowoff produces a greater combustion response to disturbances in reactant supply, mixing, etc. In ongoing tests at METC, five instability mechanisms have been identified in subscale and commercial scale nozzle tests. Changes to fuel nozzle geometry showed that it is possible to stabilize combustion by altering the timing of the feedback between acoustic waves and the variation in heat release.

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10 p.

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Richards, G.A. & Lee, G.T. September 1, 1996.

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Description

Combustion oscillations are a common problem in development of LPM (lean premix) combustors. Unlike earlier, diffusion style combustors, LPM combustors are especially susceptible to oscillations because acoustic losses are smaller and operation near lean blowoff produces a greater combustion response to disturbances in reactant supply, mixing, etc. In ongoing tests at METC, five instability mechanisms have been identified in subscale and commercial scale nozzle tests. Changes to fuel nozzle geometry showed that it is possible to stabilize combustion by altering the timing of the feedback between acoustic waves and the variation in heat release.

Physical Description

10 p.

Notes

OSTI as DE96014528

Source

  • 1996 Central States Section technical meeting of the Combustion Institute, St. Louis, MO (United States), 5-7 May 1996

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  • Other: DE96014528
  • Report No.: DOE/METC/C--96/7239
  • Report No.: CONF-9605160--4
  • Office of Scientific & Technical Information Report Number: 372671
  • Archival Resource Key: ark:/67531/metadc688953

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  • September 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 20, 2015, 8:08 p.m.

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Richards, G.A. & Lee, G.T. Gas turbine combustion instability, article, September 1, 1996; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc688953/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.