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Study of the Peak Frequency in Turbulent Vortex Ring Noise

  • ATMOSPHERIC AND AEROACOUSTICS
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Abstract

The aeroacoustic characteristics of vortex rings of different sizes have been studied using multimicrophone methods. The experiment recorded the acoustic emission upon initiation of a vortex ring and its movement along a trajectory. In order to apply the self-similarity theory of vortex motion on the entire trajectory, the formation of a vortex ring was numerically simulated in the starting area during ring initiation from nozzles of different sizes, taking into account the experimentally determined law of piston motion for each initiation. Computations are performed to obtain the geometrical dimensions of the vortices used in the self-similarity theory. Thus, the required vortex ring parameters were found throughout the entire trajectory, which made it possible to compare the characteristic frequency of noise emission from freely flying turbulent vortex rings of different sizes with the theoretical value.

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ACKNOWLEDGMENTS

The results were obtained in studies under the state assignment carried out by teams at research centers and/or the scientific laboratories of higher educational institutions, registration number 9.3480.2017/4.6. The studies were performed in a unique scientific installation “Acoustic anechoic chamber with aerodynamic noise sources,” registration number 500 617.

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Authors and Affiliations

  1. Perm National Research Polytechnic University, 614990, Perm, Russia

    V. F. Kopiev, I. V. Khramtsov & V. V. Palchikovskiy

  2. Central Aerohydrodynamic Institute (TsAGI), Moscow Research Complex, 105005, Moscow, Russia

    V. F. Kopiev

Authors
  1. V. F. Kopiev
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  2. I. V. Khramtsov
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  3. V. V. Palchikovskiy
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Correspondence to V. F. Kopiev.

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Translated by A. Carpenter

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Kopiev, V.F., Khramtsov, I.V. & Palchikovskiy, V.V. Study of the Peak Frequency in Turbulent Vortex Ring Noise. Acoust. Phys. 65, 288–296 (2019). https://doi.org/10.1134/S1063771019030035

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  • DOI: https://doi.org/10.1134/S1063771019030035

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