US Patent 10422229 Airfoil cooling

An airfoil may include an external airfoil surface and an airfoil body. The airfoil body may include an external wall structure and an internal wall structure. The external airfoil surface may be adjacent the external wall structure. The airfoil body may define a skin core that is at least partially defined by a first section of the external wall structure and a first section of the internal wall structure. The airfoil body may also define an embedded core that is at least partially defined by the first section of the internal wall structure. An embedded core heat transfer augmentation feature may be formed within the embedded core on an embedded core surface of the first section of the internal wall structure.