GAS TURBINE ENGINE LOW PRESSURE COMPRESSOR ROTOR IMPELLER (VERSIONS) Russian patent published in 2016 - IPC F04D29/32 B01J3/00 F01D5/06 

FIELD: engines and pumps.

SUBSTANCE: invention relates to engine building. Gas turbine engine low-pressure compressor (GTE LPC) rotor shaft fourth stage impeller includes disc, including hub with central hole, web and rim, as well as blades each having tail and wing with profile formed by concave pressure side and convex back. Disc rim is connected to web to make circular flanges. Disc rim is equipped with set of blades fixation grooves uniformly distributed along disc perimeter. Each slot longitudinal axis with rotor shaft axis in projection on arbitrary axial plane makes, normal to blade root radial axis, angle of α blade root installation defined in range of values α=(20.1÷29.6)°. Blade has variable on height of feather an angle γ of installation of feather profile relative to front line of profile grid of blade rim, decreasing with radial distance from rotor axis with gradient G_u.p=(217.0÷311.9) [deg/m]. Besides, blade root is made with thickness variable along blade width and height. Maximum thickness of blade root profile is greatest in root section and decreasing on height to peripheral end with gradient G_u.t.=(1.82÷2.62)·10^-2 [m/m].

EFFECT: invention allows to increase efficiency and increase gas-dynamic stability (GDS) margin at all operation modes of compressor while increasing LPC rotor impeller service life without increase of material consumption.

17 cl, 6 dwg