Non-uniform variable vanes

A gas turbine engine assembly comprising:

• a gas turbine engine casing radially outwardly supporting a variable vane assembly including at least one circular row of non-uniform same stage variable stator vanes having non-uniform airfoils;
• each of the variable stator vanes having a rotational axis;
• each of the airfoils extending inwardly from an outer button centered about a rotational axis;
• each of the variable stator vanes including an outer spindle extending outwardly from the outer button;
• the outer spindles rotatably disposed through outer trunnions mounted in outer openings in the casing;
• at least first and second portions of the plurality of same stage variable stator vanes;
• and
• a non-uniformity between airfoils of the variable stator vanes of the first portions and airfoils of the variable stator vanes of the second portion.

A gas turbine engine assembly comprising:

• a gas turbine engine casing radially outwardly supporting a variable vane assembly including at least one circular row of non-uniform same stage variable stator vanes having non-uniform airfoils;
• each of the variable stator vanes having a rotational axis;
• each of the airfoils extending inwardly from an outer button centered about a rotational axis;
• each of the variable stator vanes including an outer spindle extending outwardly from the outer button;
• the outer spindles rotatably disposed through outer trunnions mounted in outer openings in the casing;
• first and second portions of the plurality of same stage variable stator vanes disposed in first and second 180 degree sectors respectively of the row of the variable stator vanes;
• the first and second portions of the vanes having equal numbers of the vanes;
• and
• a non-uniformity between airfoils of the variable stator vanes of the first portions and airfoils of the variable stator vanes of the second portion.

A method for manufacturing a gas turbine engine assembly a gas turbine engine casing radially outwardly supporting a variable vane assembly including at least one circular row of non-uniform same stage variable stator vanes, the method comprising:

• providing counter-clockwise biased airfoils in a first one of upper and lower sectors of a single stage of non-uniform same stage variable stator vanes and clockwise biased airfoils in a second one of the upper and lower sectors of the single stage of non-uniform same stage variable stator vanes;
• manufacturing the vanes with the counter-clockwise biased and the clockwise biased airfoils disposed between spaced apart outer and inner buttons centered about rotational axis of each of the variable stator vanes;
• manufacturing the vanes with each of the variable stator vanes including an outer spindle extending outwardly from the outer button and an inner spindle extending inwardly from the inner button;
• and
• assembling the outer spindles rotatably disposed through outer trunnions mounted in outer openings in a casing.