FIELD: machine building.
SUBSTANCE: blade (10) for turbomachine rotor blade wheel comprises an aerofoil section and at least one platform on the end of the aerofoil. The blade (10) is made so that to be set together with many other essentially similar blades so as to form a ring. The platform surface is fitted by profile (80) on the suction surface side and by profile (85) on the pressure surface side, respectively along the suction surface or pressure surface. The suction surface profile (85) of the blade has a recessed section (I) of the pressure surface located in the axial direction in the upstream half of the aerofoil section. Most of the surface between the aerofoil profiles is provided by the movement of a linear segment based on the profiles (80, 85) of suction surface and pressure surface.
EFFECT: increased efficicency of blade and turbomachine due to reducing turbulence near the blade platform surface.
17 cl, 8 dwg
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