{TAIL ~ The turbine blade} 1, wherein the at least one inner wall protrusion extends from the inner wall about one half of a distance between the inner wall and {HEAD ~ the outer wall} 
{ TAIL ~ The turbine blade } 1 , wherein the at least one inner wall protrusion extends from the inner wall about one half of a distance between the inner wall and { HEAD ~ the outer wall }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD