MULTI-SECTION SILENCER BY KOCHETOV FOR NOISE REDUCTION OF GAS-DYNAMIC PLANTS EXHAUST Russian patent published in 2016 - IPC F01N1/02 

FIELD: engines.

SUBSTANCE: invention relates to noise suppression equipment of compressor stations and test boxes for gas turbine engines. Silencer incorporates cylindrical base, ejector, leveling grid on which sound-absorbing unit is fixed, consisting of sound-absorbing material layer, lined from inside with perforated shell. Unit consists of individual sequentially connected sections, in each section single sound absorbers are arranged in layers, and in silencer upper part screen is arranged, which includes cylindrical shell, from above connected with cover consisting of perforated layer and sound absorber, wherein exhaust openings are made in form of slits, made along shell periphery, and lined with sound absorbing material. Sound absorber is made in form of two regular polyhedrons concentric dimensional surfaces, wherein one of surfaces: external is made perforated, and other one: internal is made solid, and in gap between surfaces sound-absorbing element is arranged. Surfaces are connected to each other by means of, at least, two bushings, which perform functions of Helmholtz resonator necks, formed by cavity inside regular polyhedron solid surface. Element is made in form of three layers: central layer from complex shaped sound reflecting material, composed of evenly distributed hollow tetrahedrons, allowing to reflect sound waves incident in all directions, and sound-absorbing layers from materials of different density symmetrically adjacent thereto. Over its entire surface element is lined with acoustically transparent material.

EFFECT: technical result is increasing of noise absorption efficiency and structure reliability.

1 cl, 3 dwf