| 摘要 |
FIELD: machine building.SUBSTANCE: cooled turbine blade for a turbomachine comprises a blade set on a platform which is located at a stem. The blade is hollow with one or more cavities for cooling air circulation. The cavity set along the rear edge is fed by cooling air from a feeding channel made as an elbow inside the stem and connecting the air inlet in the lower stem part to the cavity of the rear edge. The channel is fitted by a recess provided under the platform and having a bell-like shape, at the axis essentially radial in respect to the inlet hole. The recess tip comprises a dedusting hole crossing the platform and is limited inside the stem by walls closing it and set essentially radially from the platform.EFFECT: invention is aimed at keeping the blade integrity by removing dust from cooling medium and at optimising the use of dedusting air in blade cooling.14 cl, 7 dwg |
