Vane for variable area turbine

A gas turbine engine comprising:

• a variable area turbine that includes a vane stage, the vane stage comprising:
• a plurality of vane platforms comprising a first vane platform and a second vane platform, one of the plurality of vane platforms being a radial inner vane platform and another of the plurality of vane platforms being a radial outer vane platform, and a space therebetween defining an air flowpath;
• a primary vane body secured at opposing radial ends to the first vane platform and the second vane platform, the primary vane body having a primary leading edge, a primary trailing edge, a primary pressure side and a primary suction side,
• a secondary vane body movably secured at the first vane platform, the secondary vane body having secondary leading edge, a secondary trailing edge, a secondary pressure side and a secondary suction side,
• the secondary vane body being movable between a stowed position, wherein the secondary vane body is outside of the air flow path and a first radial end surface of the secondary vane body is flush with the first vane platform, and a deployed position, wherein the secondary vane body is extended between the plurality of vane platforms to form a vane trailing edge extension, and
• the secondary vane body includes a plurality of radially spaced tabs that support the secondary pressure side and secondary suction side of the secondary body, the plurality of tabs defining the leading edge of the secondary vane body and the tabs forming a first boss for positioning the secondary vane body at the trailing edge of the primary vane body.

A method for decreasing a gage distance between at least two vanes in a plurality of vanes on a first vane stage of a variable area turbine, the first vane stage comprising:

• a plurality of vane platforms comprising a first vane platform and a second vane platform, one of the plurality of vane platforms being a radial inner vane platform and another of the plurality of vane platforms being a radial outer vane platform, and a space therebetween defining an air flowpath;
• a primary vane body secured at opposing radial ends to the first vane platform and the second vane platform, the primary vane body having a primary leading edge, a primary trailing edge, a primary pressure side and a primary suction side,
• a secondary vane body movably secured at the first vane platform, the secondary vane body having secondary leading edge, a secondary trailing edge, a secondary pressure side and a secondary suction side, and
• the secondary vane body being movable between a stowed position, wherein the secondary vane body is outside of the air flow path and a first radial end surface of the secondary vane body is flush with the first vane platform, and a deployed position, wherein the secondary vane body is extended between the plurality of vane platforms to form a vane trailing edge extension, and
• the secondary vane body includes a plurality of radially spaced tabs that support the secondary pressure side and secondary suction side of the secondary body, the plurality of tabs defining the leading edge of the secondary vane body and the tabs forming a first boss for positioning the secondary vane body at the trailing edge of the primary vane body;
• the method comprising extending the secondary vane body from the stowed position to the deployed position.