초록 ▼

A noise reduction system is provided for installation on a bypass turbine having a core engine, an outer casing and a thrust reverser. The system is comprised of an acoustically treated nose cowl conventional for the engine; a respaced inlet guide vane upstream of the core engine for reducing wake d

A noise reduction system is provided for installation on a bypass turbine having a core engine, an outer casing and a thrust reverser. The system is comprised of an acoustically treated nose cowl conventional for the engine; a respaced inlet guide vane upstream of the core engine for reducing wake disturbances striking the engine fan; a flow diverter downstream of the core engine for turning fan air inward toward the engine center line and for turning core air outward; a structure for supporting and positioning said flow diverter relative to the engine; a core flow expansion chamber device for slowing the peak velocity of the exhaust gas prior to exhausting it to the atmosphere; and an acoustic tailpipe assembly configured to define an outlet area sized and shaped to compensate for the mass flow loss created by the core flow expansion chamber device.

대표청구항 ▼

[ What is claimed is:] [1.] A noise reduction system for modifying a fan jet engine, the noise reduction system comprising:(a) a flow diverter assembly having an upstream end and a downstream end, the flow diverter assembly having an annular flow diverter wall axially extending from the upstream end

[ What is claimed is:] [1.] A noise reduction system for modifying a fan jet engine, the noise reduction system comprising:(a) a flow diverter assembly having an upstream end and a downstream end, the flow diverter assembly having an annular flow diverter wall axially extending from the upstream end to the downstream end, the annular flow diverter wall being formed into a plurality of circumferentially alternating radially inward and radially outward lobes, the radially inward lobes defining cold chutes for radially inwardly diverting fan air, and the radially outward lobes defining hot chutes for radially outwardly diverting exhaust gas; and(b) a core flow expansion chamber device at the downstream end of the flow diverter assembly, the core flow expansion chamber device being designed for expanding and slowing exhaust gas diverted radially outwardly by the flow diverter assembly.