Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1988-12-27
1991-10-22
Brown, Brian W.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181263, 60317, F01N 114
Patent
active
050587030
ABSTRACT:
To reduce noise, an automotive exhaust tailpipe has a convoluted surface at or near its outlet to generate pairs of counterrotating axial vortices within the exhaust gases just before or just as the gases exit the tailpipe. The convoluted surface may be the internal surface of the tailpipe, or a thin-walled convoluted member may be disposed within the tailpipe near its outlet end.
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AIAA-86-1614, "Forced Mixer Lobes in Ejector Designs", by W. Presz, Jr., and R. Gousy, dated Jun. 16-18, 1986.
AIAA-87-1867, "Lobed Nozzle Afterbody Research", by William D. Russell, dated Jun. 29-Jul. 2, 1987.
AIAA-87-0610, "Flow Structure in a Periodic Axial Vortex Array", by M. J. Werle and R. W. Paterson, dated Jan. 12-15, 1987.
AIAA-87-1837, "Short Efficient Ejector Systems", by W. Presz, Jr., and R. F. Blinn, dated Jun. 29-Jul. 2, 1987.
Ealba Robert H.
Paterson Robert W.
Presz, Jr. Walter M.
Werle Michael J.
Brown Brian W.
Revis Stephen E.
United Technologies Corporation
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