Resources Contact Us Home
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
Method and apparatus for map transmission in wireless communication system
Sealing member for piezoelectric resonator device, and piezoelectric resonator device
Direct converting apparatus, method for controlling the same, and control signal generation device
Apparatus and method of managing radio bearer in wireless communication system
Method and system for associating a cell-sector with time-dependent location parameters
Wild card auto completion
Systems and methods for velocity profile based approach to point control
  Randomly Featured Patents
Air-in-line and pressure detection
Variable speed drive pulley
Water filter
Plating apparatus
Thyristor-based device having dual control ports
Light beam rotary printer
Fuel delivery system including heat exchanger means
Space-time-power scheduling for wireless networks
Method of detecting cylinder pressure and cylinder pressure detection device in internal combustion engine
Spring type pipe support