change in swirl of gas turbine exhaust gases at off - design conditions is a key driver of exhaust diffuser inefficiency that adversely impact the gas turbine performance . conventional ways to control swirl such as blowing , suction , and vortex generation are undesirable since they require parasitic power , are complex to design , and dilute the exhaust gas energy . to address such short comings , shape memory devices are incorporated into struts of an exhaust diffuser of a gas turbine . the shape memory devices change shape in accordance with heat , which can be applied through memory device heaters . by controlling the memory device heaters , the heat applied to the shape memory devices can be controlled . the shapes of the struts can be altered through altering the shapes of the memory device in consideration of load conditions to increase the efficiency .