Film coolant passages for cast hollow airfoils

摘要: The external wall of a hollow airfoil for gas turbine engine has plurality longitudinally aligned diffusing coolant passages having their outlets at the outer surface over which hot is intended to flow. also includes extending slot formed in inner thereof. Each intersect such define metering inlets each passage receiving fluid from controlled rate. diffuses as it passes through and exits thin film on airfoil. cast time forming airfoil; are machined into outside Very small, accurate areas can thereby be single-piece airfoils without access interior