Annular airflow actuation system for variable cycle gas turbine engines

Abstract

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.

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