SECOND STAGE IMPELLER WHEEL OF HIGH PRESSURE COMPRESSOR (HPC) ROTOR OF TURBOCHARGER ENGINE (VARIANTS), HPC ROTOR IMPELLER WHEEL DISC, HPC ROTOR IMPELLER WHEEL BLADE, HPC ROTOR IMPELLER WHEEL BLADE RING Russian patent published in 2017 - IPC B01J3/00 

FIELD: machine engineering.

SUBSTANCE: impeller wheel of the second 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. 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 α_k, increasing along radial height of the root twist gradient, G_r.t=(150.2÷216.2) [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. R_d dis radius from the HPC rotor axis to the upper surface of the rim in the mean radial plane of the body is (0.59÷0.85) from the R_p.ch. radius of peripheral contour of the flowing part. The impeller wheel is made with a ratio of R_d disc radius to an average height H_av of blade root profile, constituting R_d/H_av=(2.3÷3.6). The disk blade is provided with annular beads for releasably connecting flanges adjacent to the web on both sides of the journal of the front support of the rotor of the HPC and the conical diaphragm of the disc of the fourth stage.

EFFECT: increase the efficiency and increase of gas dynamic stability resource in all operating modes of the compressor when service life of the second stage impeller wheel of the rotor high pressure compressor expands without increasing the material capacity.

22 cl, 9 dwg