Mitigation of rotating stall in turbine exhaust section using segmented auxiliary struts

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;
• and
• an auxiliary strut extending from the inner exhaust wall to the outer exhaust wall, the auxiliary strut being segmented and comprising:
• an inner portion;
• a central portion disposed radially outward from the inner portion, wherein the central portion is configured to remain stationary and refrain from rotating;
• an outer portion disposed radially outward from the central portion;
• an inner actuation assembly configured to actuate the inner portion to cause the inner portion to rotate to an inner angled position;
• and
• an outer actuation assembly configured to actuate the outer portion to cause the outer portion to rotate to an outer angled position, wherein the inner portion, the outer portion, or both are configured to rotate about one or more pivots at a leading edge of the auxiliary strut;
• and
• a controller having one or more processors, wherein the controller is configured to instruct the inner actuation assembly and/or the outer actuation assembly to cause the inner portion and/or the outer portion to rotate in a first rotational direction between first and second positions in response to a condition conducive to a rotating stall condition, a low flow condition, a reversed flow condition, or a combination thereof, in a turbine section having a plurality of turbine blades upstream of the turbine exhaust section.

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;
• and
• an auxiliary strut extending from the inner exhaust wall to the outer exhaust wall, the auxiliary strut being segmented and comprising:
• an inner portion;
• a central portion disposed radially outward from the inner portion, wherein the central portion is configured to remain stationary and refrain from rotating;
• and
• an outer portion disposed radially outward from the central portion;
• wherein the inner portion, the outer portion, or both are configured to rotate about one or more pivots at a leading edge of the auxiliary strut to an angled position;
• wherein the auxiliary strut is circumferentially disposed between adjacent struts of the turbine exhaust section;
• wherein the inner portion is configured to span an inner circumferential distance between the adjacent struts when rotated to an inner angled position;
• wherein the outer portion is configured to span an outer circumferential distance between the adjacent struts when rotated to an outer angled position;
• wherein the adjacent struts are fixed relative to the turbine exhaust section;
• wherein an axial length of the auxiliary strut is between 10 and 90 percent of an axial length of the adjacent struts.