Convolution seal for transition duct in turbine system

A turbine system, comprising:

• a plurality of transition ducts disposed in a generally annular array, each of the plurality of transition ducts comprising an inlet, an outlet, and a passage extending between the inlet and the outlet and defining a longitudinal axis, a radial axis, and a tangential axis, the outlet of the transition duct offset from the inlet along the longitudinal axis and the tangential axis, each of the plurality of transition ducts further comprising a first interface feature and a second interface feature, each of the first interface feature and the second interface feature comprising a channel, the channel comprising a first wall, a second wall opposing the first wall, and a third wall joining the first wall and the second wall;
• a plurality of convolution seals, each of the plurality of convolution seals contacting and providing a seal between a first interface feature of one of the plurality of transition ducts and a second interface feature of an adjacent one of the plurality of transition ducts, at least one of the plurality of convolution seals partially disposed in the channel of a first interface feature and partially disposed in the channel of an adjacent second interface feature, the at least one of the plurality of convolution seals comprising a plurality of legs, the plurality of legs comprising a first outer leg and a second outer leg,
• wherein an intersection of the first outer leg and another of the plurality of legs of the at least one of the plurality of convolution seals is at a non-90 degree angle and is entirely within the channel and contacts the first wall of the first interface feature and an intersection of the second outer leg and another of the plurality of legs of the at least one of the plurality of convolution seals is at a non-90 degree angle and is entirely within the channel and contacts the first wall of the adjacent second interface feature.