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A heat shield for a combustor dome includes U-shaped baffles on the outer diameter area of the upstream surface of the heat shield. The baffles are clocked with respect to the impingement openings in the combustor dome. The baffles increase cooling of the heat shield by segregating the cooling air f

A heat shield for a combustor dome includes U-shaped baffles on the outer diameter area of the upstream surface of the heat shield. The baffles are clocked with respect to the impingement openings in the combustor dome. The baffles increase cooling of the heat shield by segregating the cooling air flow from the impingement openings and by reducing cross-flow at the outer diameter of the heat shield. The baffles also function as heat shield stiffeners. Slots extend radially inward from the outer rim of the heat shield. Keyholes are at the inner ends of the slots. The slots and keyholes reduce the hoop stresses of the heat shield.

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1. A cooling apparatus for a combustor dome comprising:an annular heat shield; anda plurality of baffles positioned on an upstream surface of said annular heat shield, said baffles are U-shaped and each said baffle comprises an arc and two ribs, said arc is radially inward from said two ribs, said c

1. A cooling apparatus for a combustor dome comprising:an annular heat shield; anda plurality of baffles positioned on an upstream surface of said annular heat shield, said baffles are U-shaped and each said baffle comprises an arc and two ribs, said arc is radially inward from said two ribs, said combustor dome has an outer row and at least one inner row of impingement openings there through. 2. The cooling apparatus of claim 1, wherein said annular heat shield and said baffles are formed from a metal selected from the group consisting of nickel based alloys and cobalt based alloys. 3. The cooling apparatus of claim 1, wherein said annular heat shield and said baffles are formed from a metal selected from the group consisting of (SC)180, HA230, Mar-M-247 Eqx, and MA754. 4. The cooling apparatus of claim 1, wherein said baffles are capable of segregating an air flow coming from said outer row of impingement openings from an air flow coming from said inner row of impingement openings. 5. The cooling apparatus of claim 1, wherein the distance between said two ribs is about twice the diameter of an impingement opening in said outer row. 6. The cooling apparatus of claim 1, wherein the height of said baffles is between 0.08 inches and about 0.09 inches. 7. The cooling apparatus of claim 1, wherein said baffles are clocked to said outer row of impingement openings such that air coming from an impingement opening in said outer row contacts said annular heat shield in an area between said two ribs of said baffle. 8. The cooling apparatus of claim 1, further comprising a plurality of slots extending radially inward from an outer rim of said heat shield. 9. The cooling apparatus of claim 8, further comprising a plurality of keyholes, one said keyhole positioned at a radially inward end of each said slot. 10. The cooling apparatus of claim 1, wherein said baffles are positioned on an outer diameter area of said heat shield. 11. An apparatus for a turbine engine comprising:an annular heat shield;a plurality of baffles on an outer diameter area of said annular heat shield; anda plurality of slots, each slot extending radially inward from an outer rim of said annular heat shield and contiguously terminating with a keyhole formed in a radially inward end of each said slot. 12. The apparatus of claim 11, wherein said baffles have a length between about 0.15 inches and about 0.25 inches. 13. The apparatus of claim 11, wherein each said baffle is U-shaped and comprises an arc and two ribs, said arc is radially inward from said two ribs. 14. The apparatus of claim 13, wherein each said rib has a width of between about 0.020 inches and about 0.030 inches. 15. The apparatus of claim 11, wherein said turbine engine has a combustor dome, said combustor dome is capable of producing an air flow, and wherein said baffles are clocked such that said baffles are capable of segregating said air flow. 16. The apparatus claim 11, wherein said annular heat shield is secured within said combustor dome by a split ring. 17. The apparatus claim 11, wherein said slot has a length between about 0.15 inches and about 0.35 inches. 18. A shielding system for a combustor dome comprising:an annular heat shield; andat least one U-shaped baffle positioned on an upstream surface of said annular heat shield, said U-shaped baffle is clocked such that said U-shaped baffle is capable of segregating an air flow, said U-shaped baffle comprises an arc and two ribs, said arc is radially inward from said two ribs, said combustor dome has an outer row and at least one inner row of impingement openings there through. 19. The shielding system of claim 18, wherein air coming from an impingement opening in said outer row contacts said annular heat shield in an area between said two ribs of said U-shaped baffle and air coming from an impingement opening in said inner row contacts said annular heat shield in an area radially inward from said U-shaped baffle. 20. The shielding system of claim 18, wherein said U-shaped baffle has a length between about 0.15 inches and about 0.25 inches. 21. The shielding system of claim 18, wherein said U-shaped baffle has a height between about 0.08 inches and about 0.09 inches. 22. The shielding system of claim 18, further comprising at least one radial slot extending inward from an outer rim of said annular heat shield. 23. The shielding system of claim 22, further comprising a keyhole positioned at a radially inward end of said slot. 24. The shielding system of claim 18, wherein a plurality of said U-shaped baffles are evenly spaced on said annular heat shield. 25. The shielding system of claim 18, wherein said annular heat shield is formed from a metal selected from the group consisting of (SC)180, HA230, Mar-M-247 Eqx, and MA754. 26. The shielding system of claim 18, wherein said U-shaped baffle is positioned in an outer diameter area of said annular heat shield. 27. A cooling apparatus for a combustor dome comprising:of an annular heat shield formed from a metal selected from the group consisting of (SC)180, HA230, Mar-M-247 Eqx, and MA754;a plurality of baffles positioned on an upstream surface of said annular heat shield, said baffles each comprise an arc and two ribs, said ribs have a width between about 0.020 inches and about 0.030 inches, said combustor dome has an outer row and at least one inner row of impingement openings there through, said baffles are clocked such that said baffles are capable of segregating an air flow from said outer row of impingement openings from an air flow from an inner row of impingement openings;a plurality of slots extending radially inward from an outer rim of said annular heat shield; anda plurality of keyholes through said annular heat shield, such that there is one keyhole at an inner end of each said slot. 28. A method of cooling a combustor dome comprising the steps of:providing an annular heat shield downstream of said combustor dome, said combustor dome having an inner and an outer row of impingement openings therethrough, said inner row being capable of producing an inner row air flow, said outer row being capable of producing an outer row air flow; andpositioning a plurality of baffles on an upstream surface of said annular heat shield, each said baffle comprising an arc and two ribs, said arc positioned radially inward from said two ribs, such that said inner row air flow is segregated from said outer row air flow. 29. The method of claim 28, wherein said baffles are clocked to said outer row of impingement openings such that air coming from an impingement opening in said outer row contacts said annular heat shield in an area between said two ribs of said baffle. 30. The method of claim 28, wherein a distance between said two ribs is about twice the diameter of an impingement opening in said outer row. 31. The method of claim 28, wherein each said baffle is U-shaped. 32. The method of claim 28, further comprising a step of producing a plurality of radial slots in an outer diameter area of said annular heat shield. 33. The method of claim 28, wherein said baffles are integral to said annular heat shield.