Patent ID: 8813502

Claim:
A gas turbine combustor comprising: a combustion tube which has an inner wall surface facing a combustion zone and an outer wall surface of the combustion tube; wherein a plurality of cooling passages are formed between the inner wall surface and the outer wall surface, said plurality of cooling passages having a plurality of main coolant supply openings on said inner wall surface; a guide configured to guide coolant supplied from said plurality of main coolant supply openings into a direction along said inner wall surface; a plurality of auxiliary coolant supply openings configured to supply said coolant in a region outside said outer wall surface to a gap between said inner wall surface and said guide; wherein said coolant, which is introduced from said plurality of auxiliary coolant supply openings, is guided to the direction along said inner wall surface by said guide, said plurality of main coolant supply openings and said plurality of auxiliary coolant supply openings are formed at positions so that the positions of the main coolant supply openings and the auxiliary coolant supply openings are shifted with respect to each other by a predetermined distance in the direction of flow of said coolant guided by said guide, and relations Δ<d and D>d are satisfied where a height of the gap between said guide and the inner wall surface is Δ, the coolant supply opening is a circle having a diameter d, and a length from a downstream end of the coolant supply opening to a downstream end of the guide in a direction parallel to the central axis is D.