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.
Claims12
A method of reducing refracted sound from a power station, the power station comprising a gas turbine and an exhaust duct assembly having an exhaust gas outlet for exhausting exhaust gas into the atmosphere, the method comprising:
- positioning an acoustic duct portion 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;
- and
- operating the gas turbine,
- wherein noise from the exhaust gas propagates through the acoustically porous structure to atmosphere so as to reduce refracted sound at locations downwind from the exhaust gas outlet.
Dependencies are inferred from the claim text.