초록 ▼

A coolant passage through a wall to be cooled, such as the wall of a hollow airfoil, is shaped and oriented to eject coolant fluid therefrom within the boundary layer of hot gases flowing over the surface to film cool the wall downstream of the outlet. The passage includes a metering portion near it

A coolant passage through a wall to be cooled, such as the wall of a hollow airfoil, is shaped and oriented to eject coolant fluid therefrom within the boundary layer of hot gases flowing over the surface to film cool the wall downstream of the outlet. The passage includes a metering portion near its inlet, followed by a diffusing portion and nozzle portion. The nozzle portion, adjacent the outlet, simultaneously diverges and converges in mutually perpendicular directions to produce a more uniform coolant velocity profile, which results in increased coolant area coverage and improved cooling effectiveness.

대표청구항 ▼

A cooled wall having an internal surface defining a portion of a coolant compartment and an external surface adapted to have a hot gas flowing thereover in a downstream direction tangent to said external surface, a coolant passage through said wall having an inlet communicating with said compartment

A cooled wall having an internal surface defining a portion of a coolant compartment and an external surface adapted to have a hot gas flowing thereover in a downstream direction tangent to said external surface, a coolant passage through said wall having an inlet communicating with said compartment for receiving coolant fluid therefrom and an outlet at said external surface, said passage including, in series flow relation, a metering portion comprising a flow area of constant cross section for metering the flow of coolant fluid through said passage, a diffusing portion having an increasing cross-sectional flow area in the direction toward said outlet, and a nozzle portion terminating at said outlet, said nozzle portion including first wall surface means defining a flow path oriented to direct a flow of fluid therefrom in the generally downstream direction at a shallow angle relative to said external surface, wherein said flow path simultaneously diverges to said outlet in a longitudinal direction perpendicular to the downstream direction, and converges toward and substantially to said outlet in a direction perpendicular to the longitudinal direction, wherein said outlet is elongated in the longitudinal direction.