초록 ▼

Retractable multiple aperture arrays, mounted behind jet engines that produce jet exhausts that pass chordwise over the wings of an aircraft, are disclosed. In their operative positions, a multiple aperture array lies in the exhaust path of each engine, immediately rearwardly of the engine nacelle.

Retractable multiple aperture arrays, mounted behind jet engines that produce jet exhausts that pass chordwise over the wings of an aircraft, are disclosed. In their operative positions, a multiple aperture array lies in the exhaust path of each engine, immediately rearwardly of the engine nacelle. In this position, in a conventional manner, the arrays split the exhausts into separate streams, which entrain ambient air. The entrained ambient air mixes with the separated streams in the region where the streams recombine to suppress engine exhaust noise and move the noise source centers of the engine exhausts to positions above the wings. As a result, the wings act to shield noise from the line-of-sight community located generally beneath the wings. When not in use, the mutliple aperture arrays are each stowed in a compartment formed in the upper surface of the wing, beneath and immediately rearwardly of the engine with which the array is associated. Doors that close the entrance to these compartments may remain open when the multiple aperture arrays are in their operative positions to provide lateral noise shielding.

대표청구항 ▼

In a jet aircraft including wings and jet engines mounted such that the exhausts of said jet engines pass chordwise over said wings and create noise sources having centers located beyond the trailing edge of said wings, the improvement comprising a plurality of multiple aperture arrays, one of said

In a jet aircraft including wings and jet engines mounted such that the exhausts of said jet engines pass chordwise over said wings and create noise sources having centers located beyond the trailing edge of said wings, the improvement comprising a plurality of multiple aperture arrays, one of said multiple aperture arrays being associated with each of said jet engines of said aircraft, each of said multiple aperture arrays being movable between a stowed position whereat said multiple aperture array lies outside of the exhaust path of the jet engine with which said array is associated and an operative position whereat said multiple aperture array lies in the exhaust path of the jet engine with which said array is associated, each of said multiple aperture arrays including a plurality of apertures spaced from one another and positioned so as to split the exhaust of the jet engine with which said array is associated into separate streams when said array is in its operative position, said spacing being such that ambient air is entrained by said separate streams and mixes with the separate exhaust streams of said jet engines, said entraining and mixing of said ambient air with said exhaust streams causing the centers of said noise sources to be moved from said locations beyond the trailing edge of said wings to said locations above the wings of said aircraft.