초록 ▼

Aerodynamic flow conditions at the air intake of gas turbine engines, especially aircraft engines, comprising boundary layer deflectors are improved by movably arranging the boundary layer deflectors so that they may be retracted flush into the aircraft fuselage during take-off and low speed flight,

Aerodynamic flow conditions at the air intake of gas turbine engines, especially aircraft engines, comprising boundary layer deflectors are improved by movably arranging the boundary layer deflectors so that they may be retracted flush into the aircraft fuselage during take-off and low speed flight, and may be extended to an operating position during high speed flight. A similar retractable boundary layer deflector may be provided for an air intake for an auxiliary engine, which operates intermittently to drive auxiliary devices of an aircraft. When the auxiliary engine operates the air intake is open and the deflector is extended thereby improving the intake air flow conditions. When the auxiliary engine is shut down, the air intake is covered by a control flap and the deflector is retracted flush into the fuselage. These features provide optimal high- and low-speed flow conditions at the air intakes of the primary propulsion plant and of the auxiliary engine of an aircraft, and undesirable drag is eliminated or at least substantially reduced.

대표청구항 ▼

An apparatus for improving aerodynamic flow conditions at an air intake facing toward a flight direction for a gas turbine engine especially installed in an aircraft having a fuselage (1), comprising boundry layer deflector means opening toward said flight direction, a recess (1b) in said fuselage d

An apparatus for improving aerodynamic flow conditions at an air intake facing toward a flight direction for a gas turbine engine especially installed in an aircraft having a fuselage (1), comprising boundry layer deflector means opening toward said flight direction, a recess (1b) in said fuselage directly upstream of said air intake, wherein said boundary layer deflector means comprise an upstream edge facing toward said flight direction for peeling a boundary layer away from an air stream flowing into said air intake, said boundary layer deflector means further comprising a downstream end, hinging means (2, 2′) for pivotably hinging said boundary layer deflector means exclusively at said downstream end thereof to said fuselage downstream of said air intake, operating means operatively connected to said boundary layer deflector means for moving said boundary layer deflector means into a retracted position in said recess in said fuselage so that the boundary layer deflector means are flush with an outer surface of said fuselage in this retracted position during ground maneuvers, take-off, or low speed flight of said aircraft when said air intake is fully opened, and for moving said boundary layer deflector means into an extended operating position during high speed flight of said aircraft when said air intake is at least partially opened for bypassing a detrimental boundary layer away from said air intake during said high speed flight.