Periodic equivalence ratio modulation method and apparatus for controlling combustion instability

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Description

The periodic equivalence ratio modulation (PERM) method and apparatus significantly reduces and/or eliminates unstable conditions within a combustion chamber. The method involves modulating the equivalence ratio for the combustion device, such that the combustion device periodically operates outside of an identified unstable oscillation region. The equivalence ratio is modulated between preselected reference points, according to the shape of the oscillation region and operating parameters of the system. Preferably, the equivalence ratio is modulated from a first stable condition to a second stable condition, and, alternatively, the equivalence ratio is modulated from a stable condition to an unstable condition. The method ... continued below

Physical Description

28 p.

Creation Information

Richards, George A.; Janus, Michael C. & Griffith, Richard A. December 1, 1998.

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Description

The periodic equivalence ratio modulation (PERM) method and apparatus significantly reduces and/or eliminates unstable conditions within a combustion chamber. The method involves modulating the equivalence ratio for the combustion device, such that the combustion device periodically operates outside of an identified unstable oscillation region. The equivalence ratio is modulated between preselected reference points, according to the shape of the oscillation region and operating parameters of the system. Preferably, the equivalence ratio is modulated from a first stable condition to a second stable condition, and, alternatively, the equivalence ratio is modulated from a stable condition to an unstable condition. The method is further applicable to multi-nozzle combustor designs, whereby individual nozzles are alternately modulated from stable to unstable conditions. Periodic equivalence ratio modulation (PERM) is accomplished by active control involving periodic, low frequency fuel modulation, whereby low frequency fuel pulses are injected into the main fuel delivery. Importantly, the fuel pulses are injected at a rate so as not to affect the desired time-average equivalence ratio for the combustion device.

Physical Description

28 p.

Notes

OSTI as DE00757043

Medium: P; Size: 28 pages

Source

  • Patent File Date: 1998 Mar 03

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  • Report No.: PATENTS-US--A9034613
  • Office of Scientific & Technical Information Report Number: 757043
  • Archival Resource Key: ark:/67531/metadc706829

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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

  • December 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 1, 2018, 10:34 p.m.

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Richards, George A.; Janus, Michael C. & Griffith, Richard A. Periodic equivalence ratio modulation method and apparatus for controlling combustion instability, patent, December 1, 1998; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc706829/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.