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Azimuthal Decomposition of the Noise of a Dual-Stream Coaxial Jet

  • ATMOSPHERIC AND AEROACOUSTICS
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Abstract

Azimuthal decomposition was used to study the azimuthal composition of noise of a jet issuing from a coaxial nozzle. Various combinations of the velocities of the core and bypass jets are considered. The features observed in the spectral characteristics and in the shapes of the directivity patterns of individual azimuthal modes are analyzed, in particular, the excess noise of a coaxial jet over the noise of an equivalent fully mixed jet when there is a significant difference in velocities in the outer and inner ducts. It is also shown that the difference between them occurs in all three azimuthal modes, and the main problem for noise simulation is the coaxial jet transition zone.

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Funding

The study was financially supported by the Russian Science Foundation (grant no. 19-71-10064). Work was carried out at TsAGI’s AC-2 anechoic chamber, modernized with the financial support of the Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-11-2021-066).

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Authors and Affiliations

  1. Central Aerohydrodamics Institute (TsAGI), Moscow Research Complex, Moscow, Russia

    O. P. Bychkov, V. F. Kopiev & G. A. Faranosov

Authors
  1. O. P. Bychkov
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  2. V. F. Kopiev
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  3. G. A. Faranosov
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Correspondence to G. A. Faranosov.

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Bychkov, O.P., Kopiev, V.F. & Faranosov, G.A. Azimuthal Decomposition of the Noise of a Dual-Stream Coaxial Jet. Acoust. Phys. 68, 371–381 (2022). https://doi.org/10.1134/S1063771022040029

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  • DOI: https://doi.org/10.1134/S1063771022040029

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