Feedback control of combustion instabilities using a Helmholtz resonator with an oscillating volume
A feedback control strategy is developed for mitigating combustion instabilities using a Helmholtz resonator with an oscillating volume. This is based on the fact that the frequency at which the resonator provides maximum damping can be controlled by oscillating its cavity volume. For this, two a...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/96784 http://hdl.handle.net/10220/13059 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A feedback control strategy is developed for mitigating combustion instabilities using a
Helmholtz resonator with an oscillating volume. This is based on the fact that the frequency
at which the resonator provides maximum damping can be controlled by oscillating its cavity
volume. For this, two algorithms are developed. One is a real-time plane-wave decomposition
algorithm; the other is a finite impulse response filter, its coefficients being optimized
by the least-mean-square method but with a variable step size. The filter uses the decomposed
incident wave to determine the optimum actuation signal. The performance of the
control strategy, carried out with off-line system identification, is evaluated via a numerical
model of an unstable combustion system with a dominant longitudinal mode. It is successfully
demonstrated that the control strategy is more robust and capable of stabilizing the
combustion system at a faster rate than that of conventional filters with fixed step size. |
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