A model for premixed combustion oscillations

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Description

Combustion oscillations are receiving renewed research interest due to increasing application of lean premix (LPM) combustion to gas turbines. A simple, nonlinear model for premixed combustion is described; it was developed to explain experimental results and to provide guidance for developing active control schemes based on nonlinear concepts. The model can be used to quickly examine instability trends associated with changes in equivalence ratio, mass flow rate, geometry, ambient conditions, etc. The model represents the relevant processes occurring in a fuel nozzle and combustor analogous to current LPM turbine combustors. Conservation equations for the nozzle and combustor are developed from ... continued below

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Medium: P; Size: 28 p.

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Janus, M.C. & Richards, G.A. March 1, 1996.

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Description

Combustion oscillations are receiving renewed research interest due to increasing application of lean premix (LPM) combustion to gas turbines. A simple, nonlinear model for premixed combustion is described; it was developed to explain experimental results and to provide guidance for developing active control schemes based on nonlinear concepts. The model can be used to quickly examine instability trends associated with changes in equivalence ratio, mass flow rate, geometry, ambient conditions, etc. The model represents the relevant processes occurring in a fuel nozzle and combustor analogous to current LPM turbine combustors. Conservation equations for the nozzle and combustor are developed from simple control volume analysis, providing ordinary differential equations that can be solved on a PC. Combustion is modeled as a stirred reactor, with bimolecular reaction between fuel and air. Although focus is on the model, it and experimental results are compared to understand effects of inlet air temperature and open loop control schemes. The model shows that both are related to changes in transport time.

Physical Description

Medium: P; Size: 28 p.

Notes

OSTI as DE96004366

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  • Other Information: PBD: Mar 1996

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  • Other: DE96004366
  • Report No.: DOE/METC--96/1026
  • DOI: 10.2172/379049 | External Link
  • Office of Scientific & Technical Information Report Number: 379049
  • Archival Resource Key: ark:/67531/metadc688185

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • March 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Nov. 24, 2015, 12:49 p.m.

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Janus, M.C. & Richards, G.A. A model for premixed combustion oscillations, report, March 1, 1996; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc688185/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.