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NASA Technical Reports Server (NTRS) 20030068103: Active Control of...
by NASA Technical Reports Server (NTRS)
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Active control of high-frequency (greater than 500 Hz)
combustion instability has been demonstrated in the NASA
single-nozzle combustor rig at United Technologies
Research Center. The combustor rig emulates an actual
engine instability and has many of the complexities of a
real engine combustor (i.e. actual fuel nozzle and
swirler, dilution cooling, etc.) In order to demonstrate
control, a high-frequency fuel valve capable of
modulating the fuel flow at up to 1kHz was developed.
Characterization of the fuel delivery system was
accomplished in a custom dynamic flow rig developed for
that purpose. Two instability control methods, one model-
based and one based on adaptive phase-shifting, were
developed and evaluated against reduced order models and
a Sectored-1-dimensional model of the combustor rig. Open-
loop fuel modulation testing in the rig demonstrated
sufficient fuel modulation authority to proceed with
closed-loop testing. During closed-loop testing, both
control methods were able to identify the instability
from the background noise and were shown to reduce the
pressure oscillations at the instability frequency by
30%. This is the first known successful demonstration of
high-frequency combustion instability suppression in a
realistic aero-engine environment. Future plans are to
carry these technologies forward to demonstration on an
advanced low-emission combustor.
Date Published: 2016-10-20 22:23:45
Identifier: NASA_NTRS_Archive_20030068103
Item Size: 22659705
Language: english
Media Type: texts
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