초록 ▼

A combustor dome heat shield has a heat shield panel adapted to be mounted to a combustor dome with a back face of the heat shield panel in spaced-apart facing relationship with an inner surface of the combustor dome to define an air gap between the heat shield panel and the combustor dome. Rails ex

A combustor dome heat shield has a heat shield panel adapted to be mounted to a combustor dome with a back face of the heat shield panel in spaced-apart facing relationship with an inner surface of the combustor dome to define an air gap between the heat shield panel and the combustor dome. Rails extend from the back face of the heat shield panel across the air gap. An anti-rotation notch is defined in at least one of the rails for receiving an anti-rotation tab of an adjacent element, such as a fuel nozzle floating collar. The rails include notch cavity rails extending on either side of the anti-rotation notch. The notch cavity rails define a notch cavity for capturing coolant air leaking through the anti-rotation notch.

대표청구항 ▼

1. A dome heat shield for a combustor of a gas turbine engine, comprising a heat shield panel adapted to be mounted to a combustor dome with a back face of the heat shield panel in spaced-apart facing relationship with an inner surface of the combustor dome to define an air gap between the heat shie

1. A dome heat shield for a combustor of a gas turbine engine, comprising a heat shield panel adapted to be mounted to a combustor dome with a back face of the heat shield panel in spaced-apart facing relationship with an inner surface of the combustor dome to define an air gap between the heat shield panel and the combustor dome, rails extending from the back face of the heat shield panel across the air gap, and at least one anti-rotation notch defined in one of a first or second rail of the rails for receiving an anti-rotation tab of an adjacent element, the rails further including notch cavity rails extending from the first or second rails on either side of the at least one anti-rotation notch, at least one notch cavity defined by the notch cavity rails and in fluid flow communication with the at least one anti-rotation notch, the rails further including peripheral rails forming a closed perimeter on the back face of the heat shield panel, that define a boundary around said notch cavity rails, said at least one notch cavity, and said first and second rails; the dome heat shield further comprising first and second fuel nozzle openings defined in the heat shield panel, wherein said at least one anti-rotation notch includes first and second anti-rotation notches disposed in said respective first and second rails, and wherein said notch cavity rails connect both said first and second anti-rotation notches in fluid flow communication with at least one respective notch cavity. 2. The dome heat shield defined in claim 1, wherein the first and second rails respectively at least partly surround the first and second fuel nozzle openings. 3. The dome heat shield defined in claim 2, wherein the rails include inner and outer rings concentrically disposed about the first and second fuel nozzle openings, and wherein the first and second rails correspond to the outer rings. 4. The dome heat shield defined in claim 1, wherein said first and second rails include first and second rings respectively surrounding the first and second fuel nozzle openings, wherein said first and second anti-rotation notches are respectively defined in the first and second rings, and wherein said notch cavity rails extend from said first ring to said second ring. 5. The dome heat shield defined in claim 4, wherein said first and second rings are outer rings respectively extending about first and second inner rings, the first and second inner rings circumscribing the first and second fuel nozzle openings. 6. The dome heat shield defined in claim 1, wherein effusion holes extend through the heat shield panel within the confines of the at least one notch cavity. 7. The dome heat shield defined in claim 6, wherein heat transfer augmentation features are provided within the at least one notch cavity. 8. The dome heat shield defined in claim 7, wherein the heat transfer augmentation features include at least one of a set of pin fins and a set of trip-strips. 9. A gas turbine engine combustor comprising the dome heat shield as defined in claim 1. 10. A gas turbine engine combustor comprising: a shell having a dome, at least one dome heat shield mounted to an inner surface of the dome, first and second fuel nozzle openings defined in the at least one dome heat shield, first and second fuel nozzle components mounted to the dome, the first and second fuel nozzle components having respective anti-rotation tabs engaged in respective anti-rotation notches respectively defined in first and second rails extending from a back face of the at least one dome heat shield, the anti-rotation notches leading to at least one notch cavity defined on the back face of the at least one dome heat shield by notch cavity rails extending from the first and second rails, the notch cavity rails connecting the anti-rotation notches in fluid flow communication with the at least one notch cavity, and wherein peripheral rails form a closed perimeter on the back face of the dome heat shield and define a boundary around the notch cavity rails, the at least one notch cavity, and the first and second rails. 11. The gas turbine engine combustor defined in claim 10, wherein the first and second fuel nozzle components comprise at least one floating collar mounted between the dome and the at least one dome heat shield, the at least one floating collar having one of the anti-rotation tabs. 12. The gas turbine engine combustor defined in claim 11, wherein the at least one floating collar comprises first and second floating collars, the anti-rotation tab of the first floating collar being engaged in the anti-rotation notch of the first rail, the anti-rotation tab of the second floating collar being engaged in the anti-rotation notch of the second rail, and wherein the notch cavity rails extend from said first rail to said second rail, the anti-rotation notches of the first and second rails both leading to said at least one notch cavity. 13. The gas turbine engine combustor defined in claim 10, wherein effusion holes extend from the back face to a front face of the at least one dome heat shield within the confines of the at least one notch cavity. 14. The gas turbine engine combustor defined in claim 10, wherein pins and/or trip-strips are provided within the at least one notch cavity. 15. The gas turbine engine combustor defined in claim 12, wherein the first and second rails are provided in the form of annular rails respectively surrounding the first and second fuel nozzle openings, said annular rails defining an annular collar cavity about each of the first and second fuel nozzle openings, said annular collar cavities being connected in flow communication with the at least one notch cavity via the anti-rotation notches.