INTERNALLY COOLED AIRFOIL BLADE.

摘要

An airfoil blade includes an airfoil body with a coolant passageway having a centerline which is generally straight and generally parallel to the longitudinal axis of the airfoil body for directing coolant flow in a generally longitudinal direction. An insert is placed within the coolant passageway for imparting rotation to the longitudinal directed coolant flow such that the longitudinal directed coolant flow rotates at least one complete turn about a spin axis which is generally parallel to the centerline of the coolant passageway. In another embodiment of this invention, the passageway is twisted along its length to rotate the longitudinally directed coolant flow at least one complete turn about the spin axis to increase the heat transfer coefficient.