Air-collecting structure for enhancing cooling performance for transition piece and gas turbine combustor having same

1. An air-collecting structure for cooling a transition piece of a duct assembly in a gas turbine combustor, the air-collecting structure comprising:

a flow sleeve having a plurality of cooling holes and surrounding the transition piece, the cooling holes formed in a lateral side of the flow sleeve to receive a compressed cooling air and arranged in rows running parallel to each other in a longitudinal direction of the flow sleeve, the rows progressing up the lateral side from a lower row to a higher row; and

a plurality of scoops arranged in correspondence with predetermined cooling holes among the plurality of cooling holes, each of the plurality of scoops arranged in the rows and configured to collect an amount of the compressed cooling air according to a respective row of the rows,

wherein each of the plurality of scoops is aligned on the rows and spaced apart between the rows,

each of the plurality of scoops comprises an inlet for collecting the compressed cooling air, the inlet having an inlet radius,

the inlet radius of a first row of the plurality of scoops being larger than a second row of the plurality of scoops, the first row aligned on the higher row, the higher row being arranged on an upper portion of the lateral side,

the second row aligned on the lower row, and the lower row being arranged on a bottom portion of the lateral side, and

each scoop of the plurality of scoop has a quadrant-spherical shape and is disposed to surround substantially one half of a circumference of a respective cooling hole of the plurality of cooling holes.

2. The air-collecting structure according to claim 1 , wherein the inlet radius is constant for the plurality of scoops of any one row of the rows.

3. The air-collecting structure according to claim 2 , wherein the inlet radius of the plurality of scoops increases from the lower row to the higher row.

4. The air-collecting structure according to claim 1 , wherein the inlet is formed by a curved base, attached to the lateral side of the flow sleeve, and a cover formed of a concave surface extending from the curved base.

5. The air-collecting structure according to claim 4 , wherein the concave surface is open toward an inflow direction of the compressed cooling air, and the curved base is disposed opposite to the inflow direction.

6. The air-collecting structure according to claim 1 , wherein the plurality of scoops are arranged alternately in a vertical direction between an nth row of the rows and an (n+1)th row of the rows, where n is a natural number.

7. The air-collecting structure according to claim 6 , wherein the plurality of scoops are arranged alternately in a vertical direction between the (n+1)th row and an (n+2)th row of the rows, and wherein the plurality of scoops in the (n+2)th row are vertically collinear with the plurality of scoops in the nth row.

8. The air-collecting structure according to claim 7 ,

wherein the plurality of scoops have a repeated arrangement pattern wherein the inlet radius of the plurality of scoops in the nth row and the (n+1)th row are the same, and the inlet radius of the of the plurality of scoops in the (n+2)th row and an (n+3)th row of the rows are the same and larger than the inlet radius of the plurality of scoops in the nth row and the (n+1)th row.

9. The air-collecting structure according to claim 8 , wherein the inlet radius of the plurality of scoops in the (n+1)th row is larger than a distance between adjacent scoops of the plurality of scoops in the nth row.

10. The air-collecting structure according to claim 1 , wherein the inlet radius of a respective scoop of the plurality of scoops is substantially the same as a height of the respective scoop protruding from the lateral side.

11. The air-collecting structure according to claim 1 , wherein the plurality of cooling holes provided in the lateral side are arranged such that the plurality of cooling holes are disposed alternately in a vertical direction between an nth row of the rows and an (n+1)th row of the rows, where n is a natural number.

12. The air-collecting structure according to claim 1 , wherein the plurality of cooling holes are longitudinally disposed in the lateral side in the rows such that the plurality of cooling holes of any row of the rows are vertically aligned with the plurality of cooling holes of another row of the rows, and wherein a scoop arrangement exhibits a vertical alignment whereby the plurality of scoops in an nth row of the rows alternate in alignment with the plurality of scoops in an (n+1)th row of the rows, which in turn alternate with the plurality of scoops in an (n+2)th row of the rows, such that the plurality of scoops in the (n+2)th row are vertically collinear with the plurality of scoops in the nth row, where n is a natural number.

13. A gas turbine combustor including a duct assembly, the duct assembly comprising:

an air-collecting structure for cooling a transition piece of the duct assembly in the gas turbine combustor, the air-collecting structure comprising:

a flow sleeve having a plurality of cooling holes and surrounding the transition piece, the cooling holes formed in a lateral side of the flow sleeve to receive a compressed cooling air and arranged in rows running parallel to each other in a longitudinal direction of the flow sleeve, the rows progressing up the lateral side from a lower row to a higher row; and

a plurality of scoops arranged in correspondence with predetermined cooling holes among the plurality of cooling holes, each of the plurality of scoops arranged in the rows and configured to collect an amount of the compressed cooling air according to a respective row:

wherein each of the plurality of scoops is aligned on the rows and spaced apart between the rows,

each of the plurality of scoops comprises an inlet for collecting the compressed cooling air, the inlet having an inlet radius,

the inlet radius of a first row of the plurality of scoops being larger than a second row of the plurality of scoops, the first row aligned on the higher row, the higher row being arranged on an upper portion of the lateral side, and

the second row aligned on the lower row, and the lower row being arranged on a bottom portion of the lateral side, and

each scoop of the plurality of scoop has a quadrant-spherical shape and is disposed to surround substantially one half of a circumference of a respective cooling hole of the plurality of cooling holes.