METHOD FOR COOLING TURBINE BLADE OF LOW-PRESSURE TURBINE (LPT) OF GAS TURBINE ENGINE AND ROTOR BLADE OF LPT, COOLED BY THIS METHOD Russian patent published in 2019 - IPC F01D5/18 

FIELD: aviation.

SUBSTANCE: group of inventions relates to the field of aircraft engine building. LPT rotor impeller blade includes shank and blade airfoil with convex-concave profile. Cavity of the blade is made at the full height of the blade airfoil. Cavity of the blade in the middle most heat-stressed part making at least one third of the height ΔH_b.a. blades is equipped with a set of rods endowed with a function of high-conductor web between walls of the blade airfoil. Rods are made as a whole with a cover of the blade airfoil with displacement in adjacent crosswise rows in a staggered order not less than by a half-step leading to formation of cross diagonal rows in the grid. In the method of cooling the LPT rotor impeller blade, the blade is cooled by air fed through the pressure ring of the LPT rotor. In the cavity of the blade cooling air enters through the channel in the blade shank, fills the cavity of the blade, by purposefully cooling the most heat-stressed sections of the blade, with the heated air outlet through at least two holes in the peripheral end of the blade into the flow part of the turbine. Vane cavity has through area ∑F_in.c.l. section at inlet of cavity of feather making at least a quarter from passage area ∑F_out.c.l. section of tract channel in peripheral end of blade at outlet from cavity of blade. Rods create reduced flow section in cooling air flow and increased heat removal from blade airfoil in transverse rows in proportion to coefficient of specific aerodynamic shading of repeated cell of grid K_1s.sh.≤0.40. In diagonal rows – proportionally to coefficient K_2s.sh.≤0.35. Specific coefficient K_3s.r. area ratio F_r. enclosure of heat-removing surface of rod to unit of its volume V_r. is K_3s.r.=≥0.86×10³ [m²/m³].

EFFECT: invention is aimed at improving cooling efficiency of LPT rotor blades.

2 cl, 1 dwg