Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate
2007-10-22
2010-06-08
Donels, Jeffrey (Department: 2832)
Acoustics
Sound-modifying means
Muffler, fluid conducting type
C181S210000, C181S224000, C181S237000, C415S119000, C415S144000, C244S00100R, C060S782000, C060S785000
Reexamination Certificate
active
07730995
ABSTRACT:
Acoustic noise from relatively high pressure gas flows as a result of opening for example a bypass valve in a gas turbine engine can cause problems. By provision of an acoustic apparatus incorporating an inner chamber where there is a pressure reduction and then a chamber divider surface incorporating small apertures with a wide spacing distribution an upward shift in acoustic frequency of the gas flow is achieved beyond normal human comprehension. An outer chamber is provided to receive the fine gas flow jets from the apertures in the chamber divider surface for further pressure reduction and low pressure release through wider apertures in an exit surface.
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Handley Brian Alex
Hunt Graeme Clive
Hussain Zahid Muhammed
Donels Jeffrey
Luks Jeremy
McCormick Paulding & Huber LLP
Rolls-Royce PLC
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