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