Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1989-08-01
1990-12-25
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181264, 181269, 181273, 181296, 244 1N, F01N 108, F02K 100
Patent
active
049795872
ABSTRACT:
A compressor bleed air passageway includes a duct having an upstream section (48) which terminates in a baffle (44) and a downstream duct section (54) having a forward portion (56) which surrounds the baffle (44). Bleed air flow through openings (58) in the baffle wall (52). This reduces velocity of the bleed air stream at the duct discharge port to a value equal to or less than Mach 1.0. The baffle (44) has virtually no effect on a low-velocity, low-pressure air stream. The downstream duct section (54) may be perforated and surrounded by outer wall (64) to form sound-absorbing chambers (66).
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Caldwell Jack H.
Hirt William J.
Kumasaka Henry A.
Rushwald Ira B.
Stachowiak Claude R.
Barnard Delbert J.
Fuller Benjamin R.
Kaser Bruce A.
Pauly Joan H.
The Boeing Company
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