Tubine blade cooling
Do a Google search for <Convection cooling turbine blades> and then look at the Wikipedia article on cooling. Then look at almost any of the other references displayed for more technical information.
Impingement cooling is air directed onto the surface to be cooled striking or impinging upon it.
Film cooling directs a flow of cooling air along the surface to be cooled which acts as a protective boundary layer between the surface and the heat stream.
Convective cooling means that the air is made turbulent by various means and causes more heat transfer from metal to air.