HIGH-PRESSURE TURBINE (HPT) NOZZLE APPARATUS OF GAS TURBINE ENGINE (OPTIONS), NOZZLE CROWN OF HPT AND HPT NOZZLE APPARATUS BLADE

摘要

FIELD: engines and pumps.;SUBSTANCE: group of inventions relates to aircraft engine building, in particular to designs of nozzle apparatus of HPT and air-cooling paths for nozzle vanes of GPA of aircraft gas-turbine engines. Nozzle apparatus includes a nozzle crown. Nozzle crown is made of 14 nozzle blocks. Each block contains three blades, made in one piece with large and small shelves and endowed with each radially oriented partition dividing the internal volume of the pen blade to the front and rear cavities. Cavities are equipped with deflectors with the formation of a multi-channel air cooling path for the heat-stressed elements of the nozzle block. Structure of the NA includes outer and inner rings covering the shelves of the blocks, as well as large and small air intake rings adjacent to the rings at the entrance. Structure of the NA includes an apparatus for spinning air from the secondary stream of the combustion chamber supplied to cool the heat-stressed elements of the NA and then through the NA and spinner to cool the rotor of the HPT. Nozzle blade is made with a convex back and a concave trough, connected by inlet and outlet cooled edges. Profile chord in the root section is β_r.c. angled to the frontal plane β_r.c.≥39°. Blades are installed in the nozzle block with axial bulk at an angle of ω_a.b.=(3.28÷4.83)°, and also with a district bulk at an angle ω_a.d.b.=(7.98÷11.75)°. In this case, the blade has a sail, increasing along the height of the blade with a gradient G_b.s.=(0.19÷0.28). Trough wall of the scapula is made (2–5) % thinner than the back wall. Both walls are made with a decrease in thickness in the cross section from the input to the output edge of not less than 3.5 times. In the front cavity of the blade wall endowed with perforations, grouped in rows, for the release of cooling air into the total flow of the working fluid.;EFFECT: technical result of the group of inventions is to increase the work and life of the nozzle apparatus and the theater as a whole, the technological simplicity of production without increasing material and energy intensity.;9 cl, 11 dwg