FIELD: mechanical engineering. SUBSTANCE: cooled working blade 1 of the turbine has hollow fin 4 with leading and trailing edges, back and trough. Blade 1 is provided with walls having varying thickness in height which reduces towards end 10 of fin. In area of peripheral end 10 at height equal to 2/3 of length of fin of blade 1 at section equal to 0.2 of length of chord of respective section of blade 1 on side of back in area of leading edge, the wall of blade has thickness equal to 1.2 to 1.4 of maximum thickness of wall of respective cross section of fin. EFFECT: enhanced reliability. 2 cl, 3 dwg
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