nConvection
cooling: air flows outward from the base of the blade to the end through
internal airways within the blade.
nImpingement
cooling: air is brought radially through a center core of the blade, turned
normal to the radial direction, and passed through a series of holes.
nFilm
cooling: protects the surface from the hot fluid by injecting cool air
into the boundary layer which provides a protective, cooling film on the
surface.
nTranspiration
cooling: involves the use of a porous material through which cooling air
is forced into the boundary layer to form an insulating film.