NOZZLE SHUTTER FOR AVIATION GAS-TURBINE ENGINE (VERSIONS) AND METHOD FOR MANUFACTURE OF NOZZLE SHUTTER (VERSIONS) Russian patent published in 2009 - IPC F02K1/12 

FIELD: engines and pumps.

SUBSTANCE: nozzle shutter for aviation gas-turbine engine is arranged in the form of cone having shape of hollow truncated cone, which is flattened in transverse direction, along rectilinear geometric generatrices. Body comprises thin wall of permanent thickness, which is divided in transverse direction into trapezoidal hot wall, trapezoidal cold wall parallel to hot wall and two symmetrical side walls, which connect cold wall and hot wall by sides. Thin wall comprises solid internal surface having rounded sections with radius of curvature, which is at least equal to two thicknesses of thin wall. Thin wall is arranged from fire-resistant composite material created by reinforcing solid and crossing fibers from fire-resistant material, which are submerged in matrix from fire-resistant material. In other version trapezoidal walls have thickness that increases from side walls to central strip. In this version shutter comprises stiffening ribs, which are parallel to side walls that connect trapezoidal walls to each other and couple with them by means of rounded sections with curvature radius along internal surface, which is at least equal to double thickness of side walls. Method for manufacture of nozzle shutter comprises stages of single structure creation with solid edges from crossing fire resistant fibers, structure stretching around rigid, porous bent profiles opposite to each other and application of fire resistant matrix by means of deposition in steam-like phase onto structure and via profiles. Opposite bent profiles are arranged with prominences in diverging directions that have curvature radius, which is at least equal to double thickness of structure. In the other version nozzle shutter is made of several structures. Structures are arranged with sections overlapping each other, and matrix is solid and passes through mentioned sections that overlap each other.

EFFECT: increased strength of shutter, reduced heat transfer to its cold wall, possibility to reject air cooling of shutter between its walls.

12 cl, 16 dwg