Near-wall roughness for damping devices reducing pressure oscillations in combustion systems

摘要

A damping device for reducing pressure oscillations in a combustion system includes at least a portion provided with a first, outer wall, a second, inner wall, an intermediate plate interposed between the first wall and the second wall. This intermediate plate forms a spacer grid to define at least one chamber between said first wall and said second wall, first passages connecting each of said at least one chamber to the inner of the combustion system, and second passages connecting each of said at least one chamber to the outer of the combustion system. The second passages open at the same side of said chambers as the first passages, the second passages have a portion extending parallel to the inner wall. This parallel portion of said second passages is equipped with heat transfer enhancing means.

主权项

1. A damping device for reducing pressure oscillations in a combustion system, the damping device comprising:
a portion provided with a first outer wall, a second inner wall, an intermediate plate interposed between the first outer wall and the second inner wall, wherein the intermediate plate forms a spacer grid to define at least one chamber between the first outer wall and the second inner wall, first passages connecting each of the at least one chamber to the interior of the combustion system, and second passages connecting each of the at least one chamber to the exterior of the combustion system, wherein the second passages open at the same side of said at least one chamber as the first passages, the second passages have a section extending parallel to the second inner wall, wherein at least this parallel section of the second passages is equipped with heat transfer enhancing means and wherein the second passages have a non-circular cross section design.