METHOD AND SYSTEM FOR REDUCTION OF JET ENGINE NOISE

PROBLEM TO BE SOLVED: To attenuate jet engine noises utilizing fluid control. SOLUTION: Air velocity, in the vicinity of an inlet fan duct outer wall (22), is increased to a greater velocity than a typical velocity of an operational engine ambient inlet airflow (12), adjacent to the inlet fan duct o...

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Bibliographische Detailangaben
Hauptverfasser:	MANI RAMANI, GRAZIOSI PAOLO
Format:	Patent
Sprache:	eng
Schlagworte:	AIR INTAKES FOR JET-PROPULSION PLANTS AIRCRAFT ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSIONTRANSMISSIONS IN AIRCRAFT AVIATION BLASTING COMBUSTION ENGINES CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS COSMONAUTICS EQUIPMENT FOR FITTING IN OR TO AIRCRAFT FLYING SUITS GAS-TURBINE PLANTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS JET-PROPULSION PLANTS LIGHTING MECHANICAL ENGINEERING PARACHUTES PERFORMING OPERATIONS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To attenuate jet engine noises utilizing fluid control. SOLUTION: Air velocity, in the vicinity of an inlet fan duct outer wall (22), is increased to a greater velocity than a typical velocity of an operational engine ambient inlet airflow (12), adjacent to the inlet fan duct outer wall. A boundary layer (50) and associated turbulence is reduced or eliminated. Refraction and absorption of inlet sound into an acoustic liner (44) is optimized. Air velocity is increased by injecting air. Air velocity is increased by exerting a suction force. A system is provided to attenuate the jet engine noises. A fluid duct (80) is provided opening to an inlet fan duct outer wall (22) and to aft of a fan rotor (42). COPYRIGHT: (C)2005,JPO&NCIPI