The Use of Volumetric Sound Absorption Elements in Dissipative Plate Noise Silencers

It is known that sound attenuation in dissipative plate noise silencers increases with an increase in their length and with a decrease in the hydraulic diameter of the noise silencer cell. To increase the efficiency of sound attenuation in plate noise suppressors, it was proposed to use the surface of plates with volumetric elements. In this case, the hydraulic diameter of the silencer cell decreases, and additional attenuation occurs due to the phenomenon of diffraction. Prototypes of noise silencers were made from plates with volumetric elements in the form of semi-cylindrical concavities. Within the framework of bench acoustic tests, the characteristics of noise silencers made of plates with flat side walls and the proposed noise silencers made of plates with volumetric elements were investigated with the same density of the plates with sound-absorbing material and the constancy of the free area factor. Based on the results of field tests, an increase in the effectiveness of noise reduction was confirmed. Additionally, by numerical simulation, the aerodynamic characteristics of the studied plate noise silencers were determined. According to the results of studies for the proposed noise silencers with volumetric elements, sound attenuation values were obtained for several variants of the free area factor and the orientation of the volumetric elements of the plates – along and across the channel, as well as pressure loss depending on the flow velocity of the medium.

D.V. CHUGUNKOV¹, Ph.D. tech. sciences, associate professor (This email address is being protected from spambots. You need JavaScript enabled to view it.),
E.A. ZHURAVLEV¹, junior researcher (This email address is being protected from spambots. You need JavaScript enabled to view it.);
M.Yu. LESHKO², engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ National Research University «Moscow Power Engineering Institute» (14, Krasnokazarmennaya Street, Moscow, 111250, Russian Federation)
² Research Institute of Building Physics, Russian Academy of Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

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