Annular turbine ring rotor
A fan-turbine rotor assembly ( 24 ) includes one or more turbine ring rotors ( 32 ). Each turbine ring rotor is cast as a single integral annular ring. By forming the turbine as one or more rings, leakage between adjacent blade platforms is minimized which increases engine efficiency. Assembly of the turbine ring rotors to the diffuser ring ( 114 ) includes axial installation and radial locking of each turbine ring rotor.
1. A turbine ring rotor comprising:
first and second annular tip shrouds defined about an axis;
first and second annular bases defined about said axis;
a multitude of first turbine blades mounted between said first annular tip shroud and said first annular base;
a multitude of second turbine blades mounted between said second annular tip shroud and said second annular base, said second turbine blades spaced, relative to the axis, from said first turbine blades;
wherein each of said first and second of turbine blades defines a turbine blade passage therethrough, each of said turbine blade passages extending through a respective one of said first and second annular tip shrouds and a respective one of said first and second annular bases;
a base seal extending from said second annular base;
wherein said first annular base includes an extended axial stepped ledge; and
wherein said base seal engages said extended axial stepped ledge.
2. A fan-turbine assembly for a tip turbine engine comprising:
a fan including a multitude of fan blades which defines a core airflow passage through each of said multitude of fan blades;
a diffuser mounted to a tip segment of each of said multitude of fan blades, said diffuser in communication with each of said core airflow passages to turn air flowing therethrough from a radial airflow direction to an axial airflow direction; and
a turbine ring rotor mountable to said diffuser, said turbine ring rotor including a multitude of turbine blades mounted between an annular tip shroud and an annular base having an attachment lug extending from said annular base mountable to said diffuser.
3. The fan-turbine assembly as recited in claim 2 , wherein said diffuser includes an attachment slot.
4. The fan-turbine assembly as recited in claim 3 , wherein said attachment lug and said attachment slot are radially segmented.
5. The fan-turbine assembly as recited in claim 4 , wherein said attachment slot includes a radial stop, said radially segmented attachment lug is axially insertable into said radially segmented attachment slot along a fan axis and rotated to engage said radial stop.
6. The fan-turbine assembly as recited in claim 2 , wherein said turbine ring rotor defines a turbine blade passage which extends through each of said multitude of turbine blades and through said annular tip shroud and said annular base.
7. The fan-turbine assembly as recited in claim 6 , wherein each of said turbine blade passages is in communication with said core airflow passage.
8. The fan-turbine assembly as recited in claim 6 , wherein each of said turbine blade passages is in communication with a diffuser passage within said diffuser.
9. The fan-turbine assembly as recited in claim 2 , said turbine ring rotor is a single cast member.