Patent ID: 8721289

Claim:
A cover of an airfoil having opposing pressure and suction sides of a rotatable turbine stage to prevent fluid from crossover-flowing from a pressure side of a leading airfoil to a suction side of a trailing airfoil, the cover comprising: a cover body including a pressure side having a forward edge, which is substantially parallel with a mid-line, and a suction side having an aft edge, which is transversely oriented relative to the mid-line, such that the pressure and suction sides provide coverage area at the pressure side that is greater than coverage area at the suction side; and pressure and suction side edge portions, one of which having a shape that is angularly discontinuous relative to that of a complementary one of suction and pressure side edge portions of an aft cover of a corresponding one of a trailing and a leading airfoil, respectively, wherein the forward edge of the pressure side of the cover body is substantially straight along a circumferential dimension and the aft edge of the suction side of the cover body includes multiple edges that are each transversely oriented relative to the circumferential dimension.