ROTOR FORTH STAGE IMPELLER OF HIGH-PRESSURE COMPRESSOR (HPC) OF TURBOJET ENGINE (VERSIONS), HPC ROTOR IMPELLER DISC, HPC ROTOR IMPELLER BLADE, HPC ROTOR IMPELLER BLADE RING Russian patent published in 2017 - IPC B01J3/00 

FIELD: engine devices and pumps.

SUBSTANCE: rotor shaft fourth stage impeller of THE HPC contains a disc and rotor blades, forming a blade ring. The disc includes a hub with a central bore, body and rim. Each blade consists of a shank, airfoil with a profile, formed by concave pressure side and convex back, and a root shroud on both sides of the feather, forming a bushing surface of the flow part together with the disc rim. And the chord line of the airfoil side edges in the blade root zone forms the airfoil incidence angle of α_K, increasing along the radial height of the airfoil with an airfoil twist rate of G_a.t=(148.2÷214.4) [deg/m], with the rotor axis in plane view. The blade airfoil is designed to axially and variably twist about the rotor axis. The twisting increases radially receding from the rotor axis. The exterior surface of the disc rim has a radius, which increases in the axial section of HPC towards the working medium flow. Radius R_d of the disc from the HPC rotor axis to the rim upper surface in the mean radial plane of the body is (0.67÷0.93) of radius R_p.c. of the peripheral contour of the flow part. The impeller is designed with the ratio of disc R_d and the mean height H_mh of the blade airfoil profile, which is R_d/H_mh=(5.1÷7.4). The disc rim is equipped with ring shrouds to provide the connection with the mating shrouds of the adjacent discs - a one-piece connection with the fifth stage disc and detachable connection with the third stage disc - shaping an integral ring area of the interior contour of the HPC flow part. The disc body is equipped with a ring tapered element, facing the third stage disc, integrating the fourth stage disc into the rotor shaft both through the rims of the previous disc of the rotor shaft drum-disc shell and a conical diaphragm and body of the third stage disc.

EFFECT: higher efficiency and gain in stall margin in all operation modes of the compressor when the life of the HPC rotor fourth stage impeller increases keeping the material consumption the same.

24 cl, 9 dwg