Combustor cooling panel, transition piece and combustor including the same, and gas turbine including combustor

1. A combustor panel that defines a circumference of a combustion gas passage for combustion gas to flow through from an upstream side to a downstream side in an axial direction in which an axis of a combustor extends, the combustor cooling panel comprising:

an inner surface capable of coming in contact with the combustion gas;

an outer surface facing an opposite side from the inner surface; and

a first channel and a second channel through which a cooling medium flows, the first channel and the second channel extending between the inner surface and the outer surface in a direction along the inner surface and the outer surface, at a constant distance from the inner surface in a thickness direction that is a direction from the inner surface toward the outer surface, wherein

relative to an end zone of the first channel including an end thereof in an extension direction, the second channel has: an overlapping zone that overlaps the end zone in the extension direction of the end zone by extending in a direction having a component of the extension direction while being separated from the end zone in an intersecting direction intersecting the extension direction; and a non-overlapping zone that does not overlap the end zone in the extension direction, and

the second channel extending in an upstream direction forming a first bent portion in a first direction chosen from one of clockwise direction or counter clockwise direction, the second channel further forming a second bent portion as it extends in the upstream direction in a second direction opposite of the first direction chosen from other of the clockwise direction or the counter clockwise direction.

2. The combustor cooling panel according to claim 1 , comprising two plates, wherein

only a first plate of the two plates has grooves that form the first channel and the second channel, and

a second plate of the two plates is joined to the first plate so as to cover openings of the grooves in the first plate.

3. The combustor cooling panel according to claim 1 , wherein the first channel and the second channel each have a single inlet that opens in the outer surface and a single outlet that opens in the inner surface.

4. The combustor cooling panel according to claim 3 , comprising:

a plurality of the first channels; and

a plurality of the second channels, wherein

each of the plurality of the first channels has a single inlet and a single outlet in the extension direction,

each of the plurality of the second channels has a single inlet and a single outlet in the extension direction,

the single inlet of each first channel is positioned at a same side relative to the single outlet of each first channel among the plurality of the first channels in the extension direction,

the single inlet of each second channel is positioned at a same side relative to the single outlet of each second channel among the plurality of the second channels in the extension direction, and

the single inlet of each first channel and the single inlet of each second channel are positioned at the same side relative to the single outlet of each first channel and the single outlet of each second channel in the extension direction, respectively.

5. The combustor cooling panel according to claim 3 , wherein

one of the single inlet and the single outlet is formed in the end zone of the first channel, and

other of the single inlet and the single outer is formed in the overlapping zone of the second channel.

6. The combustor cooling panel according to claim 1 , wherein

a cross-sectional area of the first channel is constant, and

a cross-sectional area of the second channel is constant.

7. The combustor cooling panel according to claim 1 , wherein the first bent portion is formed in the non-overlapping zone of the second channel.

8. The combustor cooling panel according to claim 1 , wherein a zone inside the non-overlapping zone of the second channel on an opposite side from the overlapping zone with respect to the second bent portion extends in the extension direction.

9. The combustor cooling panel according to claim 8 , wherein the zone inside the non-overlapping zone of the second channel on the opposite side from the overlapping zone across the second bent portion is located in an extension zone defined by extending the end zone of the first channel in the extension direction.

10. The combustor cooling panel according to claim 1 , wherein

the first channel has a non-overlapping zone that continues to the end zone and does not overlap the overlapping zone of the second channel in the extension direction, and

the first channel has a first bent portion that is bent toward the overlapping zone of the second channel in the intersecting direction.

11. The combustor cooling panel according to claim 10 , wherein

the first channel has a second bent portion that is formed in a zone inside the non-overlapping zone of the first channel,

the second bent portion of the first channel is formed in a different position that the first bent portion of the first channel in the extension direction,

the second bent portion is bent in an opposite direction with respect to a direction in which the first bent portion formed in the first channel is bent,

the second bent portion is formed at an opposite side of the end zone with respect to the first bent portion formed in the first channel in the extension direction, and

the non-overlapping zone of the first channel is formed on the opposite side of the end zone with respect to the second bent portion of the first channel and the non-overlapping zone of the first channel extends in the extension direction.

12. The combustor cooling panel according to claim 1 , comprising:

a plurality of the first channels arrayed in the intersecting direction;

a plurality of the second channels arrayed in the intersecting direction; and

a third channel overlapping at least one of the second channels in the extension direction, wherein

the overlapping zone of the at least one of the second channels, and an overlapping zone of the third channel that overlaps the overlapping zone of the second channel in the extension direction, are located between a pair of first channels that are adjacent to each other in the intersecting direction among the plurality of first channels.

13. The combustor cooling panel according to claim 1 , wherein the non-overlapping zone of the second channel is formed on the downstream side relative to the overlapping zone of the second channel.

14. The combustor cooling panel according to claim 1 , wherein the extension direction is the axial direction.

15. The combustor cooling panel according to claim 1 , comprising a welded part extending in the extension direction, wherein

the overlapping zone of the second channel is located on an opposite side from the welded part with respect to the end zone of the first channel in the intersecting direction, and

the first bent portion of the second channel is bent toward the welded part.

16. The combustor cooling panel according to claim 15 , comprising a side end channel through which the cooling medium flows, the side end channel being located between the first channel and the second channel on one side and the welded part on an other side in the intersecting direction, and extending in the extension direction.

17. The combustor cooling panel according to claim 16 , wherein a cross-sectional area of the side end channel is larger than a cross-sectional area of the first channel and a cross-sectional area of the second channel.

18. A transition piece comprising the combustor cooling panel according to claim 1 .

19. A combustor comprising:

the combustor cooling panel according to claim 1 ; and

a burner that jets fuel on a side of the inner surface of the combustor cooling panel, from the upstream side toward the downstream side of the combustor cooling panel.

20. A gas turbine comprising:

the combustor according to claim 19 ; and

a turbine driven by the combustion gas from the combustor.