Patent ID: 7631483
Filing Date: 2009-12-15
Classification: B64D,F02C,F02K,F05D

Abstract:
1. A system to attenuate jet engine noise comprising: a fluid duct for increasing air velocity adjacent to an inlet fan duct outer wall, wherein said fluid duct has a first end with a slot therein opening to said inlet fan duct outer wall, a body, and a second end with a slot therein opening to aft of a fan rotor, the slot in the first end being disposed upstream of the fan rotor, wherein said fluid duct is configured such that air flows from the first end, though the body, and is injected aft of the fan rotor from the second end of said fluid duct, and wherein said fluid duct is structured of sufficient dimension for allowing a mass flow rate of air within a range of one percent to two percent of said ambient inlet air.