Patent ID: 7874794

Claim:
A blade row for a rotary machine defining a flow path along an axis of the rotary machine, said blade row comprising: a radially inner endwall; a casing component comprising a radially outer endwall opposite said radially inner endwall; and a plurality of differently shaped airfoils arranged in pairs of adjacent airfoils and extending between said radially inner endwall and said radially outer endwall, said plurality of differently shaped airfoils comprising a first airfoil and a second airfoil, each of said first and second airfoils comprising a root section adjacent said radially inner endwall, a tip section adjacent said radially outer endwall, a convex side, a concave side, a leading edge, and a trailing edge such that a channel of the flow path is defined between said convex side of said first airfoil and said concave side of said second airfoil, said casing component comprising a single projection extending radially into the channel between said convex side of said first airfoil and said concave side of said second airfoil such that said casing component comprises a non-axisymmetric shape, said projection positioned closer to said convex side of said first airfoil than to said concave side of said second airfoil and closer to said trailing edge of said first airfoil than to said leading edge of said first airfoil, each of said pairs of adjacent airfoils being associated with a differently shaped single projection.