Combustion system for a gas turbine engine
First Claim
1. A combustion system for a gas turbine engine, the combustion system incorporating a feedback loop for the control of an unstable combustion process in the combustion system, the feedback loop including:
- sensor means for sensing a cyclically varying parameter of the unstable combustion process and producing a signal corresponding thereto;
control means for phase-shifting and amplifying the signal from the sensor means; and
exciter means for changing the boundary conditions of the combustion process in accordance with the phase-shifted amplified signal;
said control means including adaptive means for monitoring the strength of the sensor signal and varying the amount by which the signal is phase-shifted and amplified to obtain a sensor signal of minimum strength, whereby said unstable combustion is substantially eliminated.
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Abstract
A combustion system for gas turbine engines incorporates a feedback loop which provides positive damping for the control of unstable combustion, particularly buzz in reheat systems, but also at least some cases of combustion rumble in main combustion systems. The feedback loop includes a sensor, a control unit and an exciter. The control unit monitors the strength of the sensor signal, which senses a cyclically varying parameter of the unstable combustion process, and adaptively varies the amount by which the signal is phase-shifted and amplified in order to obtain a sensor signal of minimum strength, this being achieved by controlling the exciter in accordance with the phase-shifted amplified signal to change the boundary conditions of the combustion process and thereby eliminate the unstable combustion.
69 Citations
12 Claims
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1. A combustion system for a gas turbine engine, the combustion system incorporating a feedback loop for the control of an unstable combustion process in the combustion system, the feedback loop including:
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sensor means for sensing a cyclically varying parameter of the unstable combustion process and producing a signal corresponding thereto; control means for phase-shifting and amplifying the signal from the sensor means; and exciter means for changing the boundary conditions of the combustion process in accordance with the phase-shifted amplified signal; said control means including adaptive means for monitoring the strength of the sensor signal and varying the amount by which the signal is phase-shifted and amplified to obtain a sensor signal of minimum strength, whereby said unstable combustion is substantially eliminated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification