FIELD: engines and pumps.
SUBSTANCE: claimed panel comprises the first core of cellular structure. The latter is arranged between the perforated coating and mid coating. The second core of cellular structure arranged between the mid coating and continuous coating. Said perforated coating comprises a pair of highly porous zones with higher perforation factor than that of the other perforated coating part. Every pair of highly porous zones is composed by the intake and discharge zones spaced apart along the axis. Said zones are communicated via the first core and mid coating with two ends of the sound wave passage channel ends, said passage being arranged in the second core with cellular structure. The other inventions of the set relates to the turbojet engine nacelle and turbine jet engine with above described panel arranged on inner and outer sides, respectively.
EFFECT: attenuated sound frequencies of appropriate turbo jet engine operating conditions.
13 cl, 8 dwg
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