Gas turbine combustor cooling structure

A gas turbine combustor cooling structure comprising:

• an inner plate of one of a combustor wall and a pilot cone wall;
• and
• an outer plate of the one of the combustor wall and the pilot cone wall, said outer plate having an inner surface and a plurality of grooves along said inner surface, said inner plate being joined to said outer plate such that an outer surface of said inner plate is arranged against said inner surface of said outer plate and covers said grooves in said inner surface of said outer plate, whereby said grooves form a plurality of rows of cooling medium passages arranged along a combustion gas flow direction;
• wherein each of said cooling medium passages has a cooling medium supply port and a cooling medium recovery port spaced apart so as to form a connection section therebetween, wherein said cooling medium supply port communicates with said cooling medium recovery port such that a cooling medium can flow into said cooling medium passage through said cooling medium supply port and can flow out of said cooling medium passage through said cooling medium recovery port;
• and
• wherein said connection section of each of said cooling medium passages has a passage cross-sectional area gradually changing along an entire length of said connection section between said cooling medium supply port and said cooling medium recovery port so that a flow velocity of the cooling medium may be gradually changed.

A gas turbine combustor cooling structure comprising:

• an inner plate of one of a combustor wall and a pilot cone wall;
• and
• an outer plate of the one of the combustor wall and the pilot cone wall, said outer plate having an inner surface and a plurality of grooves along said inner surface, said inner plate being joined to said outer plate such that an outer surface of said inner plate is arranged against said inner surface of said outer plate and covers said grooves in said inner surface of said outer plate, whereby said grooves form a plurality of rows of cooling medium passages arranged along a combustion gas flow direction;
• wherein each of said cooling medium passages has a cooling medium supply port and a cooling medium recovery port spaced apart so as to form a connection section therebetween, wherein said cooling medium supply port communicates with said cooling medium recovery port such that a cooling medium can flow into said cooling medium passage through said cooling medium supply port and can flow out of said cooling medium passage through said cooling medium recovery port;
• and
• wherein each of said cooling medium passages has a first portion having a constant cross-sectional area, and has a second portion, said first portion having a larger cross-sectional area than said second portion, and said first portion and said second portion being arranged alternately along said connection section so as to communicate with each other.

A gas turbine combustor cooling structure comprising:

• an inner plate of one of a combustor wall and a pilot cone wall;
• and
• an outer plate of the one of the combustor wall and the pilot cone wall, said outer plate having an inner surface and a plurality of grooves along said inner surface, said inner plate being joined to said outer plate such that an outer surface of said inner plate is arranged against said inner surface of said outer plate and covers said grooves in said inner surface of said outer plate, whereby said grooves form a plurality of rows of cooling medium passages arranged along a combustion gas flow direction;
• wherein each of said cooling medium passages has a cooling medium supply port and a cooling medium recovery port spaced apart so as to form a connection section therebetween, wherein said cooling medium supply port communicates with said cooling medium recovery port such that a cooling medium can flow into said cooling medium passage through said cooling medium supply port and can flow out of said cooling medium passage through said cooling medium recovery port;
• and
• wherein each of said cooling medium passages has a wave shape.