Thin liquid wall films flowing under the influence of
high-velocity turbulent gas streams were studied for the
purpose of obtaining an understanding of the mechanics
of film cooling. Conditions which insure liquid-film
attachment to solid surfaces without loss of unevaporated
liquid to the gas stream when simple radial-hole injectors
are used were found; the maximum allowable coolant flow
rate for a stable coolant film was determined (a stable
coolant film is obtained when no unevaporated coolant
is entrained by the gas stream as the result of interfacial
disturbances); and a method for calculating the evaporation
rate and the surface temperature for a stable inert coolant film was found
