Airfoil insert and corresponding airfoil and assembly

Disclosed are examples of flow-directing elements, airfoil inserts, and assemblies thereof. A flow-directing element (12) has an inner buttress (14) with an airfoil (18) extending outwardly therefrom. The airfoil includes a cavity (34) that extends within the airfoil to an exit port (66) disposed in the inner buttress. A shelf (76) disposed about the buttress defines the exit port, and the shelf includes a discourager (78a) extending into the cavity. An airfoil insert (36) has a tubular body (38) with an outlet (54) at one end. A plate (58, 60) affixed to the body at the outlet partially blocks the outlet, and includes a tab (64) extending away from the body and defining a portion of an outlet periphery. Upon assembly of the flow directing element and the insert, the tab interacts with the discourager to direct a coolant to the exit port while restricting leakage of the coolant back into the cavity, between the airfoil insert and the flow-directing element.