SEGMENT OF PLATFORM INTENDED TO ENSURE SUPPORT FOR GUIDE VANE OF NOZZLE GUIDE VANES AND METHOD OF THIS SEGMENT COOLING

摘要

FIELD: machine building.;SUBSTANCE: segment of platform intended to ensure support for nozzle guide vane for the gas turbine contains: surface of gas passage channel, in contact with gas flow exiting the combustion chamber; cooling surface located against the gas passage channel and having heat link with it; wall projecting from the cooling surface and going at least partially in the direction of flow; and additional wall projecting from the cooling surface and going at least partially in the flow direction. Distance in the direction along the circle between the wall and additional wall reduces in the flow direction. Pressure surface of the nozzle vane and segment of platform create the first edge along the first curved line, where the pressure surface and segment of platform are connected, at that the first curved line is similar to part of the aerofoil profile of the guide vane. Suction surface of the nozzle vane and segment of platform create the second edge along the second curved line, where the suction surface and segment of platform are connected, at that the second line is similar to part of the aerofoil profile of the guide vane. The wall and additional wall go approximately parallel to the first edge and second edge. Width of channel limited by the wall and additional wall decreases from the upstream section of the cooling surface towards the downstream section of the cooling surface.;EFFECT: invention increases durability of the platform segment.;13 cl, 4 dwg