FIELD: transport mechanical engineering. SUBSTANCE: blade has fin 1 with openings 2 provided at the outlet edge. The blade also has front space 3, rear space 4, and periphery space. Inner surface of fin 1 is provided with longitudinal projection 6 positioned in front space 3. Fin 1 has the second longitudinal projection 7 which forms slot 8 with the first projection. The width of the slot in lateral direction is constant, and both projections 6,7 are triangle prisms. In operation, cooling air enters space 3 and flows to the periphery space through slot 8. Air then enters rear space 4 and is discharged from the blade. EFFECT: enhanced efficiency of cooling. 2 dwg
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