Gas turbine guide nozzle vane

摘要

The internal volume of the aerofoil part (10) of a cooled vane of the nozzle guide array of a gas turbine is divided into a downstream cavity (20) partially filled by a porous body (21) and two upstream cavities (30,40) separated by a main partition (11) which is radially aligned between the leading edge (10 a ) and the concave wall (10 i ) and a transverse partition (12) which extends between the partition (11) and the convex wall (10 e ). The porous body (21) is traversed downstream to upstream by cooling fluid which then passes through a radial passage (20 a ) to an orifice (8) in a cavity (6 a ) provided in the outer platform (3) from where it exhausts through downstream openings (9). The free passage (22) of the downstream cavity (20) communicates with the ambient through holes (23) in the wall (10 i ), while the upstream cavity (40) communicates with the ambient through holes (43) in the leading edge and holes (44) in the wall (10 i ), as does the other upstream cavity (30) through holes (33) in the wall (10 e ).