A combustor heat shield has a body defining a fuel nozzle hole. The back face of the body is mounted adjacent and spaced-apart from a combustor dome. A ridge extends around the nozzle opening to a height adapted to substantially contact the combustor dome. The ridge thereby defines a cooling compart
A combustor heat shield has a body defining a fuel nozzle hole. The back face of the body is mounted adjacent and spaced-apart from a combustor dome. A ridge extends around the nozzle opening to a height adapted to substantially contact the combustor dome. The ridge thereby defines a cooling compartment between the body and the combustor dome. A plurality of slots is provided through the ridge. The slots are closed by the combustor dome to provide cooling holes when the heat shield is mounted on the combustor. The cooling holes direct pressurized cooling air from the compartment to adjacent regions of the back face of the heat shield body.
대표청구항▼
What is claimed is: 1. A heat shield for a combustor dome, the heat shield comprising a body defining a fuel nozzle hole, a back face adapted to be mounted adjacent and spaced-apart from a combustor dome, a first ridge extending around the nozzle opening and extending from the back face to a height
What is claimed is: 1. A heat shield for a combustor dome, the heat shield comprising a body defining a fuel nozzle hole, a back face adapted to be mounted adjacent and spaced-apart from a combustor dome, a first ridge extending around the nozzle opening and extending from the back face to a height adapted to substantially contact the combustor dome, the first ridge thereby defining a cooling compartment interior of the first ridge between the body and the combustor dome, a plurality of slots provided through the first ridge, the slots adapted to be closed by the combustor dome to provide cooling holes when heat shield is mounted on the combustor, the cooling holes adapted to direct pressurized cooling air within the compartment therethrough to cool an adjacent region of the body exterior of the compartment, wherein first and second arrays of pin fins are provided on the back face outwardly of the compartment on opposed sides of said plurality of slots, the plurality of slots being aligned with a pin fin free region. 2. The heat shield defined in claim 1, wherein the body extends between opposed lateral edges and radially inner and outer edges, and wherein said slots are radially oriented to direct the cooling air from the compartment towards one of said radially inner and outer edges. 3. The heat shield defined in claim 1, wherein said plurality of slots is provided on a radially outer side of the heat shield. 4. The heat shield defined in claim 2, wherein the plurality of slots are substantially parallel to one another and symmetrically disposed relative to a central radial axis of the body. 5. The heat shield defined in claim 1, wherein at least two additional ridges extend outwardly from the first ridge along said back face, and wherein said plurality of slots are provided in said first ridge between said at least two additional ridges. 6. A combustor dome comprising at least one heat shield mounted to an annular dome panel, the at least one heat shield having a heat shield body extending between opposed lateral edges and radially inner and outer edges, at least one fuel nozzle opening defined in the heat shield body, the heat shield body having a back face facing the combustor dome, the back face and the dome panel defining an air space therebetween, a ridge extending from the back face of the heat shield body around the fuel nozzle opening and generally circumscribing a central annular area, a plurality of impingement holes defined in the dome panel and disposed to direct impingement jets in the central annular area upon the back face of the heat shield body, and at least one fluid passage extending through the ridge for discharging coolant from said central annular area to an adjacent region of the back face of the heat shield body. 7. The combustor dome defined in claim 6, wherein the ridge extends from the back face to a height adapted to substantially contact the dome panel, the at least one fluid passage being formed by the dome panel and at least one slot defined in the ridge. 8. The combustor dome defined in claim 7, wherein a plurality of parallel slots is defined in a radially outer portion of the ridge. 9. The combustor dome defined in claim 6, wherein heat exchange promoting protuberances project from the back face of the heat shield body, and wherein the at least one passage is aligned with a protuberance-free region. 10. The combustor dome defined in claim 9, wherein said protuberance-free region is provided between a pair of secondary ridges extending outwardly from the ridge circumscribing the central annular area. 11. The combustor dome defined in claim 10, wherein first and second groups of heat exchange promoting protuberances are provided on both sides of the protuberance free-region and inwardly of said secondary ridges. 12. The combustor dome defined in claim 6, wherein the at least one passage is radially oriented to direct the coolant towards one of the radially inner and outer edge of the heat shield body. 13. The combustor dome defined in claim 6, wherein said plurality of impingement holes comprises a first set of holes arranged in at least one circular array around the fuel nozzle opening within the central annular area, and a second set of holes circumferentially distributed about a central axis of the annular dome panel, said second set of holes being disposed outside of said at least one circular array for directing the cooling fluid upon the regions of the back face of the heat shield located outside of the central annular area. 14. A heat shield for a combustor dome, the heat shield comprising a body defining a fuel nozzle hole, a back face adapted to be mounted adjacent and spaced-apart from a combustor dome, a first ridge extending around the nozzle opening and extending from the back face to a height adapted to substantially contact the combustor dome, the first ridge thereby defining a cooling compartment interior of the first ridge between the body and the combustor dome, a plurality of slots provided through the first ridge, the slots adapted to be closed by the combustor dome to provide cooling holes when heat shield is mounted on the combustor, the cooling holes adapted to direct pressurized cooling air within the compartment therethrough to cool an adjacent region of the body exterior of the compartment, wherein at least two additional ridges extend outwardly from the first ridge along said back face, and wherein said plurality of slots are provided in said first ridge between said at least two additional ridges.
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