FIELD: machine engineering.
SUBSTANCE: impeller wheel of the seventh stage of the TRE HPC rotor shaft contains a disc and blades that form a blade ring. The disc includes a hub with a central hole, a body and a rim. The each blade contains a shank, a blade root with a profile, formed by a concave trough and a convex back, and a root shelf on both sides of the blade root, forming together with the rim of the disc a bushing surface of the flowing part. In this case, the chord of side edges of the body in the root zone of the blade creates with the rotor axis in projection a blade root installation angle αK, increasing along radial height of the root twist gradient, Gr.t.=(166.1÷239.2) [degrees/m]. The blade root is featured with variable axial twist relative to the rotor axis, increasing with a radial distance from the axis of the rotor. The outer surface of the disc rim is made with a radius, increasing in the axial section of the HPC in the working fluid flow direction. The Rd disc radius from the HPC rotor axis to the upper surface of the rim in the mean radial plane of the body is (0.72÷0.96) of Rp.ch. radius of peripheral contour of the flowing part and with RD radius to medium height Hav of blade profile RD/Hav =(7.2÷10.8). The disc rim is provided with annular shelves for split connection with mating shelves of disc rim of the sixth and eighth stages of the HPC rotor and subsequent integration into the package with the eighth, ninth discs and the labyrinth disc by means of coupling elements.
EFFECT: increase the efficiency and increase of gas dynamic stability resource in all operating modes of the compressor when service life of the seventh stage impeller wheel of the rotor high pressure compressor expands without increasing the material capacity.
24 cl, 9 dwg
