Acoustically-treated mixer for a mixed flow gas turbine engine

Details Acoustically-treated mixer for a mixed flow gas turbine engine Acoustically-treated mixer for a mixed flow gas turbine engine

1978-01-19

1980-12-23

Hart, Douglas

Power plants

Reaction motor

Air passage bypasses combustion chamber

181220, 181222, F02K 304, F02K 126, B64D 3306

Patent

active

042402522

ABSTRACT:
In a mixed flow gas turbine engine of the type which includes an outer nacelle spaced apart from a core engine to define an annular bypass duct therebetween, there is provided a convoluted lobed mixer having a plurality of cold chutes in flow communication with the bypass duct and hot chutes in flow communication with the core engine. In order to suppress engine turbomachinery and exhaust noise, the mixer is alternatively provided with various combinations of acoustically treated lobes, spool pieces, radial splitters, and/or circumferential splitters. These acoustic treatments act in conjunction with an acoustically treated nozzle assembly and an acoustically treated plug assembly to provide an effective low aerodynamic pressure loss noise suppression system.

REFERENCES:
patent: 3048376 (1962-08-01), Howald et al.
patent: 3163982 (1965-01-01), Rice
patent: 3174581 (1965-03-01), Duthion et al.
patent: 3227240 (1966-01-01), Lee et al.
patent: 3477231 (1969-11-01), Paulson
patent: 3481427 (1969-12-01), Dobbs et al.
patent: 3568794 (1971-03-01), Hilbig
patent: 3647021 (1972-03-01), Millman et al.
patent: 3721389 (1973-03-01), MacKinnon et al.
patent: 3820628 (1974-06-01), Hanson
patent: 3861140 (1975-01-01), Krabacher

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