Patent ID: 8408002

Claim:
A gas turbine combustor comprising: a pilot burner; a plurality of main burners disposed around said pilot burner; and a basal plate for supporting said pilot burner and said main burners, wherein each of said main burners includes an extension tube provided at a downstream end thereof, wherein an outlet of said extension tube is formed so as to have two radial edges extending in a radial direction, and circumferential edges connecting said radial edges, wherein said extension tubes are located downstream of said basal plate, wherein and said basal plate is provided with openings for allowing sweep air to flow therethrough toward downstream, and wherein an opening ratio of said openings in regions between said extension tubes is set larger than an opening ratio of said openings in other regions by setting a diameter of said openings in the regions between said extension tubes larger than that of said openings in the other regions or by forming a larger number of said openings in the regions between adjacent radial edges of each of said extension tubes as compared to a number of said openings formed in the other regions of said basal plate.