초록 ▼

A variable air inlet includes an air intake duct with upper ramps, an air inlet bottom spaced below the ramp and a movable air scoop lip pivotally secured to the end of the air inlet bottom closer to the opening into the air intake duct. The air scoop lip is pivotally displaceable through two angula

A variable air inlet includes an air intake duct with upper ramps, an air inlet bottom spaced below the ramp and a movable air scoop lip pivotally secured to the end of the air inlet bottom closer to the opening into the air intake duct. The air scoop lip is pivotally displaceable through two angular operating ranges, a wider one in the subsonic/transonic range and a narrower one in the upper supersonic range. Various control members including computers are used to control the position of the lower air scoop lip. The movement in the subsonic/transonic range is effected in response to the flight machnumber and the aircarft angle of attack based on a given control law. The control in the supersonic range is established in response to a variable demand pressure ratio between the static pressure above the upper ramps and the free stream total pressure, with the variable demand pressure ratio being a function of the actual air scoop lip position.

대표청구항 ▼

An air intake control for a variable air inlet, such as for a two-dimensional oblique shock diffuser for gas turbine engines for the propulsion of high performance aircraft, comprising an axially extending air intake duct having an inlet end and comprising upper ramps located at the inlet end, an ai

An air intake control for a variable air inlet, such as for a two-dimensional oblique shock diffuser for gas turbine engines for the propulsion of high performance aircraft, comprising an axially extending air intake duct having an inlet end and comprising upper ramps located at the inlet end, an air inlet bottom spaced below said upper ramps and spaced in the axial direction of said air intake duct from the inlet end, a movable air scoop lip pivotally connected to said air inlet bottom about an axis extending transversely of the axial direction of said air intake duct and extending from said axis located at the end of said air inlet bottom closer to the inlet end toward said inlet end, drive means for moving said air scoop lip in a lower subsonic/transconic, wider-angular operating range (A) between a lower set point (a) with a maximum set angle of dA-max more remote from said upper ramps and a mean set point (b) closer to said upper ramps, and a smaller angular range (B) between said mean set point (b) and an upper mean set point (c) closer to said upper ramps than said mean set point (b) and said smaller angular range (B) having a maximum set angle of dB-max, first control means for producing a first electrical control demand signal for driving said drive means and moving said air scoop lip in the wider-angular operating range (A) in response to flight machnumber (M) and the the aircraft angle of attack (adA=f(1/M), a