... of a mainstream streamtube q * = infrared surrounding radiance DR = density ratio α = hole surface angle β = hole compound angle ɛ = infrared emissivity η F = film effectiveness η F ¯ = laterally averaged film effectiveness ρ ∞/ c...

... that have left the airfoil surface. Also explored are the implications of endwall film cooling for infrared (IR) vane surface temperature measurements. The reduced endwall temperatures reduce the thermal emissions from this surface, so reducing the amount of extraneous radiation reflected from the vane...