Exhaust gas assembly
AssigneeThe University of Adelaide
InventorsBenjamin Cazzolato, Carl Quentin Howard, Orddom Leav, Chris Turnbull
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Abstract
An exhaust duct assembly for conveying exhaust gases emanating from a combustion zone to atmosphere is disclosed. The assembly includes: an exhaust gas outlet for exhausting exhaust gas into the atmosphere; and an acoustic duct portion located upstream of the exhaust gas outlet, the acoustic duct portion having a peripheral wall defining a through-passage arranged and constructed to promote propagation of sound there-through. The acoustic duct portion has a length in a flow direction that is at least 50% of an average hydraulic diameter of the through-passage.
Claims15
An exhaust duct assembly for conveying exhaust gases emanating from a combustion zone to atmosphere, the assembly including:
- an exhaust gas outlet for exhausting exhaust gas into the atmosphere;
- and
- an acoustic duct portion located upstream of the exhaust gas outlet, the acoustic duct portion having a peripheral wall defining a through-passage arranged and constructed to promote propagation of sound there-through to atmosphere, the peripheral wall including an acoustically porous structure, and wherein the acoustic duct portion has a length (L) in a flow direction that is at least 50% of an average hydraulic diameter (DH) of the through-passage,
- wherein, in use, said propagation of sound there-through to atmosphere reduces refracted sound at locations downwind from the exhaust gas outlet.
An exhaust duct assembly for conveying exhaust gases emanating from a combustion zone to atmosphere, the assembly including:
- an exhaust gas outlet for exhausting exhaust gas into the atmosphere;
- and
- an acoustic duct portion located upstream of the exhaust gas outlet, the acoustic duct portion having an acoustic duct wall having a structural portion and non-structural portion, the structural portion constructed to hold the shape of the acoustic duct portion and having a plurality of apertures extending therethrough, the non-structural portion of the acoustic duct portion arranged adjacent to the structural portion and made from an acoustically non-reflective structure to allow at least a range of low frequency sound to pass there-through to atmosphere, and wherein the acoustic duct portion has a length (L) in a flow direction that is at least 50% of an average hydraulic diameter (DH) of the through-passage,
- wherein, in use, said propagation of sound there-through to atmosphere reduces refracted sound at locations downwind from the exhaust gas outlet.
Dependencies are inferred from the claim text.