Mitigation of rotating stall in turbine exhaust section using flow control vanes disposed therein

A system, comprising:

• a turbine exhaust section comprising:
• an exhaust flow path;
• an inner exhaust wall radially disposed along the exhaust flow path;
• an outer exhaust wall radially disposed along the exhaust flow path radially outward of the inner exhaust wall;
• and
• a flow control vane extending between a first end and a second end, wherein the first and second ends are circumferentially offset from one another, the flow control vane is configured to move between a retracted position and an extended position, the flow control vane is disposed along one of the inner and outer exhaust walls in the retracted position, the flow control vane extends between the outer exhaust wall and the inner exhaust wall in the extended position, and the flow control vane extends radially between the first and second ends in the extended position.

A system, comprising:

• a turbine exhaust section comprising:
• an exhaust flow path;
• an inner exhaust wall radially disposed along the exhaust flow path;
• an outer exhaust wall radially disposed along the exhaust flow path radially outward of the inner exhaust wall;
• and
• a flow control vane extending between a first end and a second end, wherein the first and second ends are circumferentially offset from one another, the flow control vane is configured to move between a retracted position and an extended position, the flow control vane is disposed along one of the inner and outer exhaust walls in the retracted position, the flow control vane extends between the outer exhaust wall and the inner exhaust wall in the extended position, and the flow control vane extends radially between the first and second ends in the extended position, and the flow control vane has a variable width between the first and second ends.