Patent ID: 9151502
Filing Date: 2015-10-06
Classification: F02C,F23D,F23R

Abstract:
1. A system for reducing modal coupling of combustion dynamics, the system comprising: (a) a plurality of combustors arranged in a circumferential array about a common longitudinal axis, each combustor having a liner defining a combustion chamber and a cap assembly having an axial cap length; (b) at least one fuel nozzle disposed within each combustor upstream of the combustion chamber, each of the at least one fuel nozzles being housed within the cap assembly and a first fuel nozzle of the at least one fuel nozzle comprising an axially extending center body, a shroud circumferentially surrounding at least a portion of the axially extending center body and a plurality of vanes extending radially between the center body and the shroud, the vanes being curved to impart swirl to a working fluid flowing between the shroud and the center body, each vane defining at least a first fuel port located at a first axial distance from a front end of the combustion chamber and further comprising an edge located at a second axial distance from the front end of the combustion chamber; wherein at least one of the first axial distance and the second axial distance of the first fuel nozzle in a first combustor of the plurality of combustors is different from the first axial distance and the second axial distance of the first fuel nozzle in a second combustor of the plurality of combustors, and wherein the plurality of vanes of one of the fuel nozzles is located at an inlet of a corresponding shroud.