초록 ▼

A discharge nozzle of a jet engine has lobes, tubes or deflectors for promoting mixing of the engine discharge flow with ambient air to reduce jet noise. By providing the lobes, tubes or deflectors at only the upper portion of the discharge nozzle, jet noise perceived below the engine is reduced sub

A discharge nozzle of a jet engine has lobes, tubes or deflectors for promoting mixing of the engine discharge flow with ambient air to reduce jet noise. By providing the lobes, tubes or deflectors at only the upper portion of the discharge nozzle, jet noise perceived below the engine is reduced substantially without shifting the noise spectrum to include a higher proportion of piercing and irritating high frequency noise components. Additionally, in a turbofan, the fan or secondary flow is discharged below the primary exhaust flow to further reduce noise perceived below the turbofan.

대표청구항 ▼

The method of reducing the noise perceived at a desired location speed from a jet engine including a discharge nozzle having a generally planar discharge end without any substantial turbulence-promoting fore-and-aft extending notch which comprises promoting substantially more rapid mixing of the por

The method of reducing the noise perceived at a desired location speed from a jet engine including a discharge nozzle having a generally planar discharge end without any substantial turbulence-promoting fore-and-aft extending notch which comprises promoting substantially more rapid mixing of the portion of the discharge gas flow of such engine at its side generally remote from such desired location than at its side closer to such desired location.