Silencer for high velocity gas flow
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorWilliam D. Bryce
Life of this patent
Estimating the term…
Abstract
The invention provides a silencer for high velocity gas flow which includes a flow passage 2 and a domed, perforated plate 1 which terminates the flow passage, wherein the perforated portions 9 of the plate are distributed over the plate so as to direct gas from the passage as plurality of divergent jets 7 whereby noise is produced with a frequency at maximum intensity in a range of the audible spectrum at which human auditory perception is relatively insensitive. Such a silencer may be used to reduce the perceived noise emitted by a gas turbine engine when for reasons of engine handling and response excess air bled from the compressor stages.
Claims4
A silencer incorporated in a bypass duct of a jet engine, the silencing means having:
- an air bleed passage,
- the air bleed passage connected at a first end to an air bleed valve,
- the air bleed valve controlling the output of high pressure air from the engine core to the air bleed passage,
- at a second end of said air bleed passage a terminating plate, the terminating plate being domed and perforated, said perforations being distributed over the surface of said plate so as to direct gas issuing from said passage to form a plurality of diverging jets, said jets mixing with the gas flowing in the bypass duct, whereby
- noise produced by said divergent jets and bypass gases have a frequency at maximum intensity in a range of the audible spectrum at which human auditory perception is relatively insensitive.
Dependencies are inferred from the claim text.