System for controlling combustion dynamics and method for operating the same

1. A method of controlling combustion dynamics comprising:

providing a flow of premixed fuel and air into a combustor, the combustor comprising:

a combustion chamber;

an inlet for feeding a fuel-air mixture into the combustion chamber;

a fixed dome plate at an upstream end of the combustion chamber; and

a liner connected to the fixed dome plate and extending along a length of the combustion chamber;

at least one movable dome plate disposed within the combustion chamber and axially movable with respect to the fixed dome plate to control one or more recirculating zones;

monitoring combustion for combustion dynamics;

comparing level of combustion dynamics with an acceptable limit; and

actuating the movable dome plate to control combustion dynamics based upon the comparison.

2. The method of claim 1 , wherein the monitoring comprises sensing static pressure and dynamic pressure via a plurality of sensors in the combustion chamber.

3. The method of claim 1 , wherein the monitoring comprises sensing temperature via a plurality of sensors in the combustion chamber.

4. The method of claim 1 , wherein the monitoring comprises sensing heat release via a plurality of sensors in the combustion chamber.

5. The method of claim 1 , wherein the monitoring comprises sensing changes in optical output of the flame via a plurality of sensors in the combustion chamber.

6. A method of controlling combustion dynamics comprising:

providing a flow of premixed fuel and air into a combustor, the combustor comprising:

a combustion chamber;

an inlet for feeding a fuel-air mixture into the combustion chamber;

a fixed dome plate at an upstream end of the combustion chamber; and

a liner connected to the fixed dome plate and extending along a length of the combustion chamber;

at least one movable liner disposed within the combustion chamber and radially movable with respect to the liner to control one or more recirculating zones,

monitoring combustion for combustion dynamics;

comparing level of combustion dynamics with an acceptable limit; and

actuating the movable liner to control combustion dynamics based upon the comparison.

7. A system for controlling combustion dynamics comprising:

a combustor having a combustion chamber and an inlet for feeding a fuel-air mixture into the combustion chamber;

a fixed dome plate at an upstream end of the combustion chamber;

a liner connected to the fixed dome plate and extending along a length of the combustion chamber;

at least one sensor for sensing conditions in the combustion chamber; and

at least one movable dome plate disposed within the combustion chamber and axially movable with respect to the fixed dome plate to control one or more recirculating zones in response to the at least one sensor.

8. The system of claim 7 , wherein the at least one movable dome plate comprises a plurality of movable dome plates to shape one or more recirculation zones in the combustion chamber.

9. The system of claim 7 , further comprising an actuator connected to the movable dome plate, wherein the actuator is configured to move the movable dome plate so as to optimize the shape, size and frequency modes of one or more recirculation zones in the combustion chamber.

10. The system of claim 9 , wherein the actuator comprises one or more electric, hydraulic or pneumatic actuators.

11. The system of claim 7 , further comprising a control system connected to the at least one sensor and the at least one movable dome plate to monitor and control combustion dynamics in the combustion chamber.

12. The system of claim 11 , the at least one sensor comprises a plurality of sensors configured to sense changes in at least one of temperature, static pressure upstream of the combustion chamber, static pressure downstream of the combustion chamber, dynamic pressure upstream of the combustion chamber, dynamic pressure downstream of the combustion chamber, heat release and optical output of the flame and output signals to the control system.

13. A gas turbine engine system comprising a combustor wherein the combustor comprises:

a combustion chamber;

an inlet for feeding a fuel-air mixture into the combustion chamber;

a dome plate at an upstream end of the combustion chamber;

a liner connected to the fixed dome plate and extending along a length of the combustion chamber;

at least one sensor for sensing conditions in the combustion chamber; and

at least one movable liner disposed within the combustion chamber and radially movable with respect to the combustor liner to control one or more recirculating zones in response to the at least one sensor.

14. The system of claim 13 , wherein the at least one movable liner comprises a plurality of movable liners to shape one or more recirculation zones in the combustion chamber.

15. The system of claim 13 , further comprising an actuator connected to the movable liner, wherein the actuator is configured to move the dome plate so as to optimize the shape, size and frequency modes of one or more recirculation zones in the combustion chamber.

16. The system of claim 15 , wherein the actuator comprises one or more electric, hydraulic or pneumatic actuators.

17. The system of claim 13 , further comprising a control system connected to the at least one sensor and the at least one dome plate to monitor and control combustion dynamics in the combustion chamber.

18. The system of claim 13 , wherein the at least one sensor comprises a plurality of sensors configured to sense changes in at least one of temperature, static pressure upstream of the combustion chamber, static pressure downstream of the combustion chamber, dynamic pressure upstream of the combustion chamber, dynamic pressure downstream of the combustion chamber, heat release and optical output of the flame and output signals to the control system.