Annular airflow actuation system for variable cycle gas turbine engines
An annular airflow control system for a gas turbine engine includes a sync ring rotatable to move a multiple of contra-rotating variable vanes between an open position and a closed position to throttle an airflow through said multiple of contra-rotating variable vanes.
1. An annular airflow control system for a gas turbine engine comprising:
a multiple of contra-rotating variable vanes; and
a sync ring rotatable to move the multiple of contra-rotating variable vanes between an open position and a closed position to throttle an airflow through said multiple of contra-rotating variable vanes,
wherein said multiple of contra-rotating variable vanes are located between an outer ring and an inner ring,
wherein each of said multiple of contra-rotating variable vanes includes a control post and a pivot post that interact with at least one of said outer ring and said inner ring, said control post interacts with a non-linear slot in at least one of said outer ring and said inner ring,
wherein each of said control posts from each of said multiple of contra-rotating variable vanes extends through a linear slot in said sync ring, and
wherein each of said linear sots are located parallel to a central longitudinal engine axis.
2. The system as recited in claim 1 , wherein said sync ring is located radially outboard of said outer ring.
3. The system as recited in claim 2 , further comprising an actuator to rotate said sync ring.
4. The system as recited in claim 1 , wherein said non-linear slot alternatively extends proximate either a leading edge or a trailing edge of each of said multiple of contra-rotating variable vanes.
5. The system as recited in claim 1 , wherein said non-linear slot is alternatively located either forward or aft of a pivot aperture in said outer ring and said inner ring.
6. An annular airflow control system for a gas turbine engine comprising:
a multiple of contra-rotating variable vanes; and
a sync ring rotatable to move the multiple of contra-rotating variable vanes between an open position and a closed position to throttle an airflow through said multiple of contra-rotating variable vanes,
wherein said multiple of contra-rotating variable vanes are located between an outer ring and an inner ring,
wherein each of said multiple of contra-rotating variable vanes includes a control post and a pivot post that interact with at least one of said outer ring and said inner ring, said control post interacts with a non-linear slot in at least one of said outer ring and said inner ring,
wherein said non-linear slot is alternatively located either forward or aft of a pivot aperture in said outer ring and said inner ring.
7. The system as recited in claim 6 , wherein each of said control posts from each of said multiple of contra-rotating variable vanes extends through a linear slot in said sync ring.
8. The system as recited in claim 6 , wherein said sync ring is located radially outboard of said outer ring.
9. The system as recited in claim 8 , further comprising an actuator to rotate said sync ring.
10. The system as recited in claim 6 , wherein said non-linear slot alternatively extends proximate either a leading edge or a trailing edge of each of said multiple of contra-rotating variable vanes.