SYSTEM AND METHOD FOR REDUCING COMBUSTION DYNAMICS

摘要

A system and method for reducing combustion dynamics includes first and second combustors, and each combustor includes a fuel nozzle and a combustion chamber downstream from the fuel nozzle. Each fuel nozzle includes an axially extending center body, a shroud that circumferentially surrounds at least a portion of the axially extending center body, a plurality of vanes that extend radially between the center body and the shroud, a first fuel port through at least one of the plurality of vanes at a first axial distance from the combustion chamber, a second fuel port through the center body at a second axial distance from the combustion chamber, and the plurality of vanes are at a third axial distance from the combustion chamber. The system further includes structure for producing a combustion instability frequency in the first combustor that is different from the combustion instability frequency in the second combustor.

主权项

1. A system for reducing combustion dynamics, the system comprising:
a. first and second combustors arranged about an axis, wherein each combustor comprises a fuel nozzle and a combustion chamber downstream from the fuel nozzle; b. wherein each fuel nozzle comprises an axially extending center body, a shroud that circumferentially surrounds at least a portion of the axially extending center body, a plurality of vanes that extend radially between the center body and the shroud; a first fuel port through at least one of the plurality of vanes being located at a first axial distance from the combustion chamber, a second fuel port through the center body being located at a second axial distance from the combustion chamber, and the plurality of vanes being located at a third axial distance from the combustion chamber; and c. wherein at least one of the first axial distance, the second axial distance, and the third axial distance in the first combustor is different from the first axial distance, the second axial distance, and the third axial distance in the second combustor, thereby producing a combustion instability frequency in the first combustor that is different from the combustion instability frequency in the second combustor.