Gas turbine and gas turbine combustor

F - Mech Eng,Light,Heat,Weapons – 23 – R

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F23R 3/04 (2006.01)

Patent

CA 2340107

The present invention relates to a gas turbine combustor for homogeneous air to flow in by eliminating the turbulences from the air thereby to reduce the combustion instability. In a combustor 3, there are arranged at the center a pilot nozzle 8 and eight main nozzles 7 around the pilot nozzle 8. The air flows in around the individual nozzles 7 and 8 to the leading end of the combustor 3 so that it is used for the combustion. An annular flow ring 20 having a semicircular section is disposed at the upstream end portion of a combustion cylinder 10, and a punching metal (or porous plate) 50 and a surrounding punching metal rib 51 are disposed downstream of the flow ring 20. The air inflow is smoothly turned at first by the flow ring 20 and is then straightened by the punching metal 50 so that the air flows without any disturbance around the individual nozzles i and 8 to the leading end thereby to reduce the combustion instability.

L'invention concerne une chambre de combustion à turbine à gaz permettant d'éliminer les perturbations de flux d'air entrant, ce qui donne un flux d'air entrant uniforme et permet ainsi de réduire l'instabilité de combustion. Une buse pilote (8) est placée au centre de la chambre de combustion (3) et huit buses principales (7) sont placées sur le pourtour (7), l'air s'écoulant depuis ce pourtour, autour des buses (7) et (8) et vers l'extrémité de celles-ci aux fins de combustion. Un plancher en forme d'anneau (20) de section transversale semi-circulaire est placé à l'extrémité côté amont d'un cylindre de combustion (10) et une pièce métallique étampée (plaque poreuse) (50) ainsi qu'une nervure métallique étampée (51) sont placées du côté aval et sur le pourtour, respectivement, moyennant quoi un flux d'air entrant est d'abord orienté uniformément par le plancher (20), puis redressé par la pièce métallique étampée (50), s'écoulant depuis le pourtour, autour des buses (7) et (8) et vers l'extrémité de celles-ci, sans perturbations, ce qui permet de réduire l'instabilité de combustion.

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