Patent ID: 7694522

Claim:
A gas turbine comprising: an outer wall liner in which a combustion chamber is formed; and a heat exchange wall provided inside said outer wall liner, wherein a cooling medium flows through a space between said outer wall liner and said heat exchange wall, said heat exchange wall comprising: a base plate; a plurality of first protrusions provided on said base plate; and a plurality of second protrusions provided on said base plate, wherein a plurality of lines of said first protrusions are periodically arranged in a first pitch in a first direction, wherein said first protrusions in each of the plurality of lines of said first protrusions are periodically arranged in a second pitch in a second direction orthogonal to said first direction, wherein adjacent two lines of the plurality of lines of said first protrusions are arranged to be shifted by a half of said first pitch, wherein a plurality of lines of said second protrusions are periodically arranged in said first pitch in said first direction, wherein each of the plurality of lines of said second protrusions is arranged between adjacent two of the lines of said first protrusions, wherein a cooling air flows in said second direction, wherein said second protrusions direct the cooling air towards said first protrusions, wherein each of the first protrusions has a pair of second protrusions directly upstream, and wherein each pair of said second protrusions converges from their upstream ends to their downstream ends.