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Title: Periodic equivalence ratio modulation method and apparatus for controlling combustion instability

Abstract

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.

Authors:
; ;
Publication Date:
Sponsoring Org.:
US Department of Energy
OSTI Identifier:
20050810
Alternate Identifier(s):
OSTI ID: 20050810
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 9 May 2000
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMBUSTION CONTROL; COMBUSTION INSTABILITY; NOZZLES; PULSE COMBUSTION; PULSE COMBUSTORS

Citation Formats

Richards, G.A., Janus, M.C., and Griffith, R.A. Periodic equivalence ratio modulation method and apparatus for controlling combustion instability. United States: N. p., 2000. Web.
Richards, G.A., Janus, M.C., & Griffith, R.A. Periodic equivalence ratio modulation method and apparatus for controlling combustion instability. United States.
Richards, G.A., Janus, M.C., and Griffith, R.A. Tue . "Periodic equivalence ratio modulation method and apparatus for controlling combustion instability". United States.
@article{osti_20050810,
title = {Periodic equivalence ratio modulation method and apparatus for controlling combustion instability},
author = {Richards, G.A. and Janus, M.C. and Griffith, R.A.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}