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US 7,870,721 B2Granted
Gas turbine engine providing simulated boundary layer thickness increase
AssigneeUnited Technologies Corporation
InventorsMichael Winter, Ashok K. Jain
Life of this patent
Estimating the term…
Abstract
A nacelle assembly for a gas turbine engine includes a fan cowl disposed about an axis, a core cowl within the fan cowl and a bleed passage having an inlet that receives a bleed airflow and an outlet that discharges the bleed airflow in an upstream direction from the outlet. The bleed airflow is selectively introduced near a boundary layer of an inlet lip section of the fan cowl.
Claims10
A nacelle assembly, comprising:
- a fan cowl disposed about an axis;
- a core cowl at least partially within said fan cowl;
- a low pressure compressor stage and a high pressure compressor stage disposed within said core cowl;
- and
- a bleed passage at least partially disposed within said fan cowl and having an inlet that receives a bleed airflow and an outlet that discharges said bleed airflow in an upstream direction from said outlet, wherein said bleed airflow is selectively communicated from a location separate from the high pressure compressor stage and introduced through an interior wall of said fan cowl near a boundary layer of an inlet lip section of said fan cowl.
2 more elements
A nacelle assembly, comprising:
- a fan cowl disposed about an axis;
- a core cowl at least partially within said fan cowl;
- a bleed passage having an inlet that receives a bleed airflow and an outlet that discharges said bleed airflow in an upstream direction from said outlet, wherein said bleed airflow is selectively introduced near a boundary layer of an inlet lip section of said fan cow;
- and
- a valve positioned adjacent said outlet, wherein said valve includes at least one flap assembly pivotally attached to said outlet and actuable to introduce said bleed airflow near said boundary layer of said inlet lip section.
2 more elements
A nacelle assembly, comprising:
- a fan cowl disposed about an axis;
- a core cowl at least partially within said fan cowl;
- a bleed passage at least partially disposed within said fan cowl and having an inlet that receives a bleed airflow and an outlet that discharges said bleed airflow in an upstream direction from said outlet, wherein said bleed airflow is selectively introduced through an interior wall of said fan cowl near a boundary layer of an inlet lip section of said fan cowl;
- and
- a valve is positioned adjacent said outlet and is selectively actuable to introduce said bleed airflow near said boundary layer of said inlet lip section;
- wherein said valve includes at least one flap assembly pivotally attached to said outlet and actuable to introduce said bleed airflow near said boundary layer of said inlet lip section.
3 more elements
Dependencies are inferred from the claim text.