Gas turbine combustor including an acoustic damper device
View Patent ↗An exemplary combustor includes at least a portion having an inner liner and an outer cover plate, which together form an interposed cooling chamber. A plurality of hollow elements extend from the liner and protrude into the cooling chamber. Each hollow element defines a damping volume connected to an inner volume of the combustion chamber via a calibrated duct. During operation, the hollow elements damp pressure pulsations and, in addition, also transfer heat.
1. A combustor comprising:
at least a portion having an inner liner and an outer cover plate which together form an interposed cooling chamber;
a set of hollow elements configured such that each hollow element in the set extends from said liner and protrudes into the cooling chamber, and each set of hollow elements defines a damping volume at least partly interposed within the cooling chamber and connected to a combustion chamber via a calibrated duct, such that during operation said hollow elements damp pressure pulsations and transfer heat,
wherein in order to support the liner, at least some hollow elements define fixing hollow elements connected to the cover plate.
2. The combustor as claimed in claim 1 , wherein the hollow elements have purge holes connecting the cooling chamber with the damping volume.
3. The combustor as claimed in claim 1 , wherein the hollow elements are aligned along the cooling flow direction.
4. The combustor as claimed in claim 1 , wherein the hollow elements are staggered with respect to the cooling flow direction.
5. The combustor as claimed in claim 1 , wherein the hollow elements have one of a cylindrical, elliptical, airfoil type shape or combinations thereof.
6. The combustor as claimed in claim 1 , wherein different sets of hollow elements define different damping volumes.
7. The combustor as claimed in claim 1 , wherein the set of hollow elements have the damping volume filled with a damping material.
8. The combustor as claimed in claim 1 , wherein a top wall of the set of hollow elements is separated from the cover plate.
9. The combustor as claimed in claim 1 , wherein the cover plate is provided with through holes in which the fixing hollow elements are housed.
10. The combustor as claimed in claim 9 , wherein the fixing hollow elements have shoulders against which the cover plate rests.
11. The combustor as claimed in claim 10 , wherein the fixing hollow elements have a threaded end portion connected to the cover plate via bolts.
12. The combustor as claimed in claim 1 , wherein the fixing hollow elements have an adjustable top wall.
13. The combustor as claimed in claim 12 , wherein the adjustable top wall of the fixing hollow elements comprises a threaded cap fixed into a corresponding threaded portion of the fixing hollow elements.