Turbine cooling construction

Claim 1

In a gas turbine engine including a combustion section, a turbine section and an exit section, a double walled outer casing extending around said combustion section, turbine section and exit section, said turbine section including a turbine rotor mounted for rotation therein, said rotor including a rotor disk, a plurality of blades mounted on said turbine disk, the center of said rotor disk being closed, said rotor disk thereby forming a solid wall, fixed means extending rearwardly from said disk with its outer wall forming an annular exit passageway with the casing, inlet means at the rear end of the exit section of the double walled outer casing for admitting a cryogenic fluid, exit guide vanes extending between the inner wall of said double-wall casing and the outer wall of the fixed means within said annular exit passageway, said fixed means being double walled with a central passage means connecting the rear double wall to a location adjacent the rear of the disk and a concentric passage means connecting the front double wall to a second location adjacent the rear of the disk, said exit guide vanes and cooperating double walls being divided so that the double walled casing around said exit section is connected to the rear part of the double walled fixed means and the forward part of the double walled fixed means is connected to the double walled casing aroUnd the turbine section and combustion section, said disk having passageways therein which have inlets at one location and exits at another, said passageways being connected to passages in the blades, means connecting the inlets of said passageways to said central passage means and the exits to said concentric passage means, a double walled inner casing located radially inwardly from the double walled casing and forwardly of the turbine rotor forming an annular combustion chamber with said double walled outer casing, turbine inlet nozzles extending between the double walled outer casing and the rear end of the double walled inner casing just upstream of the blades, said nozzles having a passageway therethrough connecting the interior of the two double walls, a plurality of injection means connecting the double walled outer casing to the forward end of the double walled inner casing, said injection means having openings for injecting a fluid into the combination chamber.