Turbine rotor cooling air static collector
A gas turbine engine with an air cooled turbine component in which spent cooling air from the turbine component is routed through a rotor disk and into a static vaned diffuser on a static part of the engine so that the spent cooling air can be discharged into the combustor instead of into the turbine hot gas stream. The static vaned diffuser includes de-swirling vanes that de-swirl the flow coming off of the rotor and then diffuses the de-swirled air to increase a pressure for discharge into the combustor.
1 : A gas turbine engine comprising:
a compressor to produce a compressed air for a combustor;
a turbine to drive the compressor from a hot gas stream;
an air cooled turbine component;
a turbine rotor disk with a turbine rotor blade extending therefrom;
a turbine stator vane adjacent to the turbine rotor disk;
a cooling air tube extending through the turbine rotor disk to channel spent cooling air from one side of the rotor disk to an opposite side;
the cooling air tube having a nozzle on a discharge end;
a static part of the engine having a static vaned diffuser located adjacent to the cooling air tube nozzle such that spent cooling air discharged from the nozzle will flow into the static vaned diffuser;
the static vaned diffuser including an outboard inlet flow path to constrain and direct the outwardly centrifuging spent cooling flow jet into the vaned diffuser and located just outboard of the nozzles by the minimum required radial anti-clashing clearance; and,
the static vaned diffuser including de-swirling vanes to de-swirl the spent cooling air from the rotating cooling air tube and located axially forward of the nozzles by the minimum required anti-clashing clearance.
2 : The gas turbine engine of claim 1 , and further comprising:
the cooling air tube nozzle has a slightly radial upward discharge direction.
3 : The gas turbine engine of claim 1 , and further comprising:
the static vaned diffuser includes a downward curved section.
4 : The gas turbine engine of claim 1 , and further comprising:
a diffuser located immediately downstream from the de-swirler vanes of the static vaned diffuser.
5 : The gas turbine engine of claim 1 , and further comprising:
the cooling air tube nozzle has a diverging top view to form a uniform circumferential jet and a converging side view to accelerate the flow.
6 : The gas turbine engine of claim 1 , and further comprising:
a labyrinth seal formed between the rotor disk and an extension of the static vaned diffuser.
7 : The gas turbine engine of claim 6 , and further comprising:
a radial clearance between the cooling air tube nozzle and the static vaned diffuser is less than an axial clearance.
8 : The gas turbine engine of claim 1 , and further comprising:
the turbine rotor disk with the cooling air tube is a first stage turbine rotor disk.
9 : The gas turbine engine of claim 5 , and further comprising:
the cooling air tube nozzle is angled away from the rotor rotation direction in the top view to reduce the cooling flow swirl angle in the static frame of reference.
10 : The gas turbine engine of claim 1 , and further comprising:
the number of cooling air tubes is equal to the number of turbine rotor blades on the rotor.