Retrofit dirt separator for gas turbine engine

1. A gas turbine engine comprising:

a core engine casing;

a turbine section within said core engine casing, and there being static vanes and rotating blades in said turbine section, and a space being defined radially inwardly of said core engine casing and in said turbine section, with a cooling air supply directed into said space;

a dirt separator mounted within said space, and in said turbine section, said dirt separator being formed of a plurality of circumferentially extending separate parts which are assembled separately into said core engine casing; and

said core engine case has a plurality of radially inwardly extending clevis tabs, and said dirt separator including a support ring which is affixed to said clevis tabs.

2. A gas turbine engine comprising:

a core engine casing;

a turbine section within said core engine casing, and there being static vanes and rotating blades in said turbine section, and a space being defined radially inwardly of said core engine casing and in said turbine section, with a cooling air supply directed into said space;

a dirt separator mounted within said space, and in said turbine section, said dirt separator being formed of a plurality of circumferentially extending separate parts which are assembled separately into said core engine casing; and

said separate parts include overlapping ends which circumferentially overlap and support opposed ends of an adjacent one of said plurality of separate parts.

3. The gas turbine engines as set forth in claim 2 , wherein said dirt separator includes both an inner liner and an outer liner with said inner liner and said outer liner being secured together, and said overlapping ends include a circumferentially extending end of said inner liner on one end of one of said adjacent one of said separate parts which underlies and supports a circumferentially extending end of said outer liner of the adjacent one of said separate parts.

4. A gas turbine engine comprising:

a core engine casing;

a turbine section within said core engine casing, and there being static vanes and rotating blades in said turbine section, and a space being defined radially inwardly of said core engine casing and in said turbine section, with a cooling air supply directed into said space;

a dirt separator mounted within said space, and in said turbine section, said dirt separator being formed of a plurality of circumferentially extending separate parts which are assembled separately into said core engine casing; and

said dirt separator is provided with a plurality of louvers which serve to direct dirt and other impurities radially outwardly.

5. The gas turbine engine as set forth in claim 4 , wherein said dirt separator includes a collection space and said louvers are for directing dirt into said collection space.

6. A dirt separator for a gas turbine engine comprising:

a plurality of circumferentially extending separate parts which are assembled together into a turbine section of a gas turbine engine; and

said dirt separator includes a support ring which is affixed to clevis tabs on a core engine casing.

7. A dirt separator for a gas turbine engine comprising:

a plurality of circumferentially extending separate parts which are assembled together into a turbine section of a gas turbine engine; and

said separate parts include overlapping ends which circumferentially overlap and support opposed ends of an adjacent one of said plurality of separate parts.

8. The dirt separator as set forth in claim 7 , wherein said dirt separator includes both an inner liner and an outer liner with said inner liner and said outer liner being secured together, and said overlapping ends include a circumferentially extending end of said inner liner on one end of one of said adjacent one of said separate parts which underlies and supports a circumferentially extending end of said outer liner of the adjacent one of said separate parts.

9. A dirt separator for a gas turbine engine comprising:

a plurality of circumferentially extending separate parts which are assembled together into a turbine section of a gas turbine engine; and

said dirt separator is provided with a plurality of louvers which serve to direct dirt and other impurities radially outwardly.

10. The dirt separator as set forth in claim 9 , wherein said dirt separator includes a collection space and louvers are for directing dirt into said collection space.

11. A method of assembling a dirt separator into a gas turbine engine comprising the steps of:

providing a plurality of circumferentially separate dirt separator parts, and moving said dirt separator parts into a cooling air flow path in a turbine section of a gas turbine engine, and then assembling said dirt separator parts together.

12. The method of claim 11 , wherein a support ring supports said separate parts of said dirt separator in the cooling air flow path.

13. The method of claim 12 , wherein said support ring includes a plurality of circumferentially spaced tabs, and a core engine casing includes a plurality of circumferentially spaced clevis tabs, with said tabs on said support ring being moved axially beyond said clevis tabs on said core engine casing by moving said tabs on said support ring through spaces between said clevis tabs on said core engine casing, and then rotating said support ring to align said tabs on said support ring with said clevis tabs on said core engine casing, and attaching said support ring to said clevis'tabs on said core engine casing.