Gas turbine engine systems involving cooling of combustion section liners

1. A gas turbine engine comprising:

a compressor;

a turbine operative to rotate the compressor; and

a combustion section operative to provide thermal energy for rotating the turbine;

the combustion section comprising:

a transition piece having an open, upstream end;

a liner having an outer side, an inner side, an upstream end and a downstream end, the outer side being configured to face away from a combustion reaction of the combustion section, the inner side being configured to face the combustion reaction, and the downstream end being received within the open, upstream end of the transition piece such that gas associated with the combustion reaction is directed from the liner, through the transition piece and to the turbine;

a barrier wall attached to the outer side of the liner;

a cooling air channel located between the outer side of the liner and the barrier wall, and in fluid communication with an aperture in the barrier wall;

a plurality of cooling holes extending between the cooling air channel and the inner side of the liner; and

a seal positioned between downstream end of the liner and the transition piece;

the combustion section being operative to direct cooling air from the outer side of the liner, through the aperture, the cooling air channel and the cooling holes, to the inner side of the liner to cool a portion of the downstream end of the liner obstructed by the transition piece.

2. The gas turbine engine of claim 1 , wherein the combustion section further comprises a cooling slot formed in the outer side of the liner and in fluid communication with the cooling air channel, the cooling slot extending between at least a portion of the barrier wall and the inner side of the liner.

3. The gas turbine engine of claim 1 , wherein the seal comprises a hula seal.

4. The gas turbine engine of claim 1 , wherein:

the liner has an endwall extending between the outer side and the inner side; and

the liner has holes formed through the endwall and in fluid communication with the cooling air channel.

5. The gas turbine engine of claim 4 , wherein the holes are effusion holes.

6. The gas turbine engine of claim 1 , wherein the engine is an industrial gas turbine engine.

7. A combustion section of a gas turbine engine comprising:

a transition piece having an upstream end;

a liner having an outer side, an inner side and a downstream end, the outer side being configured to face away from a combustion reaction of the combustion section, the inner side being configured to face the combustion reaction, and the downstream end being sized and shaped to be received within the upstream end of the transition piece;

a barrier wall attached to the outer side of the liner;

a cooling air channel located between the outer side of the liner and the barrier wall, and in fluid communication with an aperture in the barrier wall, at least a portion of the cooling air channel being located in a vicinity of the downstream end of the liner such that, when the downstream end is inserted into the transition piece, a first portion of the cooling air channel is located within the transition piece and a second portion of the cooling air channel is located outside the transition piece;

cooling holes formed through the inner side of the liner, the cooling holes being in fluid communication with the cooling air channel such that cooling air provided to the cooling air channel through the aperture is directed into the transition piece, through the cooling holes and to the inner side of the liner such that at least a portion of the liner obstructed by the transition piece receives cooling air; and

a seal position between the downstream end of the liner and the transition piece.

8. The combustion section of claim 7 , at least a portion of the barrier wall being located in a vicinity of the downstream end of the liner such that, when the downstream end is inserted into the transition piece, a first portion of the barrier wall is located within the transition piece and a second portion of the barrier wall is located outside the transition piece.

9. The combustion section of claim 7 , further comprising a cooling slot formed in the outer side of the liner and in fluid communication with the cooling air channel, the cooling slot extending between at least a portion of the barrier wall and the outer side of the liner.

10. The combustion section of claim 7 , wherein the seal comprises a hula seal.

11. The combustion section of claim 7 , wherein the liner has an endwall and holes formed through the endwall, the holes being in fluid communication with the cooling air channel.

12. The combustion section of claim 11 , wherein the holes are effusion holes.

13. A combustion liner for a combustion section of a gas turbine engine, the liner comprising:

an outer side, an inner side, an upstream end and a downstream end, the outer side being configured to face away from a combustion reaction, the inner side being configured to face the combustion reaction;

a barrier wall attached to the outer side of the liner;

a cooling air channel located between the outer side of the liner and the barrier wall, and in fluid communication with an aperture in the barrier wall, at least a portion of the cooling air channel being located in a vicinity of the downstream end;

cooling holes formed through the inner side of the liner, the cooling holes being in fluid communication with the cooling air channel such that cooling air provided to the cooling air channel from the aperture is directed through the cooling holes and to the inner side of the liner such that at least a portion of the inner side of the liner receives cooling air despite a corresponding portion located on the outer side of the liner being obstructed from directly receiving cooling air; and

a seal positioned between the downstream end of the liner and the transition piece.

14. The liner of claim 13 , wherein the holes are effusion holes.

15. The liner of claim 13 , further comprising:

an endwall extending between the inner side and the outer side; and

holes formed through the endwall and in fluid communication with the cooling air channel.

16. The liner of claim 13 , further comprising a cooling slot formed in the outer side of the liner, the cooling slot being in fluid communication with the cooling air channel.