Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Jet engine noise suppression system










Image Number 5 for United States Patent #4909346.

A noise suppression system for use with a jet aircraft engine having a plug support cylinder affixed to the engine, a tubular ejector shroud affixed to the engine and encompassing the plug support, the shroud having a reduced internal diameter adjacent the aft end and a plurality of spaced apart blow-in openings formed circumferentially about the shroud forward end providing passageways for the entrance of ambient air from the exterior to the interior of the shroud. A blow-in door is secured to the shroud for opening and closing each of the blow-in openings. A translating plug is supported on the plug support cylinder and is positionable between a forward position and an aft position and forms an annular exhaust nozzle between the exterior of the plug and the interior of the aft end of the shroud. A daisy mixing nozzle is positioned within the shroud aft of the blow-in doors, the nozzle being configured of a plurality of lobes providing undulating interior and exterior surfaces. When the plug is in the forward position the blow-in doors are open permitting ambient air to mix with exhaust gas from the jet engine and the nozzle area is enlarged producing lower gas velocities and lower sound intensities. When the plug is in the aft position, the blow-in doors are closed and the nozzle area is reduced providing higher gas velocities for increased thrust with some increase in sound intensity.








 
 
  Recently Added Patents
Apparatus for tuning a musical instrument, and a related instrument
Systems for usage based rate limiting over a shared data link
Switchgear operating apparatus and three-phase switchgear
Compositions and methods of vascular injury repair
Systems and methods for unchoked control of gas turbine fuel gas control valves
Process and intermediates for preparing lapatinib
High performance design rule checking technique
  Randomly Featured Patents
Polyester resin for use in toner binder and process for producing the same
Storing a device management encryption key in a network interface controller
Method and apparatus for distributing keys to secure devices such as a postage meter
Hard cup brassiere
Semiconductor device with fluorine-containing interlayer dielectric film to prevent chalcogenide material layer from exfoliating from the interlayer dielectric film and process for producing t
Electronic musical instrument
Motor control method and motor control apparatus
Cooling apparatus for gas turbine moving blade and gas turbine equipped with same
Fuel cell
Alkylated phosphazene oligomers and polymers and method of preparation thereof