A heat shield is disclosed. The heat shield may comprise a body having a back surface and an opposite front surface, wherein an opening in the body communicates through the front and back surfaces. The heat shield may further comprise at least one radial rail disposed on the back surface and extendi
A heat shield is disclosed. The heat shield may comprise a body having a back surface and an opposite front surface, wherein an opening in the body communicates through the front and back surfaces. The heat shield may further comprise at least one radial rail disposed on the back surface and extending radially outward from the opening for directing cooling air flow.
대표청구항▼
1. A heat shield for a combustor comprising: a body having first and second side edges, an inner edge, an outer edge, a back surface and a front surface opposite the back surface, wherein an opening in the body communicates through the front and back surfaces;a plurality of effusion holes extending
1. A heat shield for a combustor comprising: a body having first and second side edges, an inner edge, an outer edge, a back surface and a front surface opposite the back surface, wherein an opening in the body communicates through the front and back surfaces;a plurality of effusion holes extending from the back surface to the front surface, the plurality of effusion holes providing discharge of cooling air flow from the back surface to the front surface; anda plurality of rails disposed on the back surface for orienting and directing cooling air flow, the plurality of rails including a first side rail disposed on the first side edge,a second side rail disposed on the second side edge,a circular rail disposed about the opening,first and second mid-rails extending from opposite sides of the circular rail, the first mid-rail joining the circular rail and the first side rail, and the second mid-rail joining the circular rail and the second side rail,a radially inner rail extending along the inner edge, the radially inner rail joining the first side rail and the second side rail,a radially outer rail extending along the outer edge, the radially outer rail joining the first side rail and the second side rail, andat least one radial rail extending outwardly from the circular rail. 2. The heat shield of claim 1, wherein the plurality of effusion holes extend at an angle from the back surface to the front surface. 3. The heat shield of claim 1, further comprising at least one oblong-shaped rib disposed on the back surface. 4. The heat shield of claim 1, further comprising a plurality of radial inner ribs disposed on the back surface near the inner edge. 5. The heat shield of claim 1, further comprising a plurality of radial outer ribs disposed on the back surface near the outer edge. 6. The heat shield of claim 1, wherein the combustor has a centerline, and wherein the mid-rail divides the body into a radially outward half and a radially inward half with respect to the centerline of the combustor. 7. The heat shield of claim 6, further comprising: a first set of effusion holes disposed between the radially inner rail and a plurality of radial inner ribs, the radially inner rail and the plurality of radial inner ribs directing the cooling air flow to the first set of effusion holes; anda second set of effusion holes disposed between the radially outer rail and a plurality of radial outer ribs, the radially outer rail and the plurality of radial outer ribs directing the cooling air flow to the second set of effusion holes. 8. The heat shield of claim 7, further comprising a third set of effusion holes surrounding the circular rail, and wherein the radially inner, radially outer, first side, second side, circular, first mid-, second mid- and at least one radial rails and the plurality of radial inner ribs and the plurality of radial outer ribs direct the cooling air flow to the third set of effusion holes. 9. The heat shield of claim 8, wherein the plurality of radial inner ribs and the plurality of radial outer ribs generally extend circumferentially with respect to the centerline of the combustor and are laterally oriented in a staggered arrangement near the inner and outer edges, respectively. 10. The heat shield of claim 8, wherein a staggered arrangement of the plurality of radial inner ribs and the plurality of radial outer ribs at least partially separates the inner and outer edges from the rest of the body. 11. The heat shield of claim 1, further comprising a plurality of pins on the back surface, the plurality of pins spatially arranged in a diamond formation. 12. The heat shield of claim 1, further comprising a plurality of pins on the back surface, the plurality of pins spatially arranged in a chevron formation. 13. The heat shield of claim 1, further comprising a plurality of raised trip strips on the back surface, the plurality of raised trip strips configured to further direct cooling air flow on the back surface. 14. The heat shield of claim 13, wherein the plurality of raised trip strips are v-shaped. 15. A bulkhead assembly comprising: a heat shield mounted to and spaced apart from a shell, the shell having a plurality of impingement holes through which cooling air flow passes and impinges on the heat shield, the heat shield having a body having first and second side edges, an inner edge, an outer edge, a back surface, and a front surface opposite the back surface, wherein an opening in the body communicates through the front and back surfaces,a circular rail disposed about the opening,first and second side rails disposed on the first and second side edges,first and second mid-rails extending from opposite sides of the circular rail, the first mid-rail joining the circular rail and the first side rail, and the second mid-rail joining the circular rail and the second side rail,a plurality of radial rails disposed on the back surface and extending radially outward from the circular rail, the plurality of radial rails dividing the back surface of the body into a plurality of compartments for directing the cooling air flow,a radially inner rail extending along the inner edge, the radially inner rail joining the first side rail and the second side rail,a radially outer rail extending along the outer edge, the radially outer rail joining the first side rail and the second side rail, anda plurality of effusion holes in the body communicating through the front and back surfaces, the plurality of effusion holes providing discharge of the cooling air flow from the back surface to the front surface,wherein the first and second side rails, the radially inner rail, and the radially outer rail orient the cooling air flow toward the plurality of effusion holes. 16. The bulkhead assembly of claim 15, wherein each of the impingement holes through the shell is located to achieve isothermal temperatures on the heat shield. 17. The bulkhead assembly of claim 15, wherein hot gas path temperatures and the plurality of compartments on the back surface of the heat shield determine a number and location of the plurality of impingement holes on the shell. 18. A combustor for a gas turbine engine, comprising: an inner liner and an outer liner defining a combustion chamber; anda bulkhead assembly at one end of the combustion chamber, the bulkhead assembly having a heat shield mounted to and spaced apart from a shell, the heat shield having a body having first and second side edges, an inner edge, an outer edge, a back surface, a front surface opposite the back surface, the back surface facing the shell, and an opening in the body communicating through the front and back surfaces, anda plurality of rails disposed on the back surface, the plurality of rails dividing the back surface of the body into a plurality of compartments for directing cooling air flow, the plurality of rails including a first side rail disposed on the first side edge,a second side rail disposed on the second side edge,a radially inner rail extending along the inner edge, the radially inner rail joining the first side rail and the second side rail,a radially outer rail extending along the outer edge, the radially outer rail joining the first side rail and the second side rail,a circular rail concentrically disposed about the opening,first and second mid-rails extending from opposite sides of the circular rail, the first mid-rail joining the circular rail and the first side rail, and the second mid-rail joining the circular rail and the second side rail, andat least one radial rail extending outwardly from the circular rail, the shell having a plurality of impingement holes through which cooling air flow passes and impinges on the back surface of the body of the heat shield, each of the impingement holes located to achieve isothermal temperatures on the heat shield,wherein the plurality of rails and the plurality of compartments provide orientation of the cooling air flow toward a plurality of effusion holes through the body of the heat shield.
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이 특허에 인용된 특허 (10)
Pacheco-Tougas, Monica; Costigan, Francis K.; Stoner, Matthew D., Bulkhead panel for use in a combustion chamber of a gas turbine engine.
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