초록 ▼

A noise suppression system for a jet engine of an aircraft having a device for blocking a flow of exhaust gases down the exhaust nozzle of the engine, and a device for separating the exhaust gases into a plurality of exhaust streams spaced a predetermined distance apart and having a smaller cross-se

A noise suppression system for a jet engine of an aircraft having a device for blocking a flow of exhaust gases down the exhaust nozzle of the engine, and a device for separating the exhaust gases into a plurality of exhaust streams spaced a predetermined distance apart and having a smaller cross-sectional area than that of the original flow of exhaust gases. The separating device also directs the exhaust streams into the ambient air from points outside the periphery of a nacelle covering the engine. The aforementioned predetermined distance separating the exhaust streams, and the cross-sectional area of the exhaust streams, are chosen so that engine noise is shifted to a higher frequency spectrum than that of the original flow of exhaust gases, and then substantially dissipated within a short distance of the aircraft.

대표청구항 ▼

[ Wherefore, what is claimed is:] [1.] A noise suppression system for a jet engine of an aircraft, comprising:(a) a blocking apparatus for blocking a first portion of a flow of exhaust gases flowing down an exhaust nozzle of the engine; and,(b) a separating device for separating the first portion of

[ Wherefore, what is claimed is:] [1.] A noise suppression system for a jet engine of an aircraft, comprising:(a) a blocking apparatus for blocking a first portion of a flow of exhaust gases flowing down an exhaust nozzle of the engine; and,(b) a separating device for separating the first portion of the flow of exhaust gases blocked by the blocking apparatus into multiple streams of exhaust gases spaced a predetermined distance apart, and for directing the streams of exhaust gases from points outside of a nacelle covering the engine towards a rear of the engine; and wherein,(c) the predetermined distance separating the streams of exhaust gases and a cross-sectional area of the streams of exhaust gases are chosen so that noise generated by the engine and carried by the exhaust gases is shifted to a higher average frequency than that of the original flow of exhaust gases; and(d) an injection apparatus for injecting outside air into the interior of the exhaust nozzle aft of the blocking apparatus to cause a mixing of a remaining portion of the flow of exhaust gases not blocked by the blocking apparatus with the outside air.