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
Time sharing type autostereoscopic display apparatus and method for driving the same
Treatment of diabetes with milk protein hydrolysate
Apparatus for transmitting and receiving data in a wireless communication system and method thereof
System and method for operating an electric power converter
Thermoforming sheet loading apparatus and method
Soybean cultivar CL1013663
Nanoparticles in a flash memory using chaperonin proteins
  Randomly Featured Patents
Methods and apparatus to operate an audience metering device with voice commands
Floor cleaner base portion
Apparatus and method for high-throughput asynchronous communication with flow control
Battery connection plate having busbar and terminal
Security fence system
Filtration adjuvants, filtration supports, filtration process using them and process for regenerating said adjuvants
Method for producing a transistor
Transmission system with lamella coupling for all wheel drive vehicle
Americana creme linen cabinet