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Investigation of the generation of sound waves produced by turbulent jets

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Abstract

Free turbulent jets produce disturbances in the ambient medium which at a certain distance from the jet are perceived as sound waves. These disturbances are due to unsteady fluctuating motion of the medium in the jet flow (intermittance). The origin of the acoustic disturbances can be attributed to turbulence intermittance. Due to lowered pressure in the movable dynamic inhomogeneities of the turbulent fluid, they induce air ejection by the jet, which turns out to be fluctuating in nature, since the turbulent fluid flow is unsteady. The proposed mechanism of the generation of acoustic disturbances accompanying turbulent jet propagation is verified in numerical and experimental studies; in particular, the formation of acoustic fluctuations in the half-space over a surface which contains an embedded fluctuating finite-size sink is considered on the basis of the numerical solution of the unsteady Reynolds equations. From the results of the numerical experiment performed using large eddy simulation the fluctuating characteristics of the flow in a swirling jet and the direction of the disturbance energy flux in the ambient medium are determined. An experimental investigation of the disturbances produced by a strongly swirling jet is also carried out.

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Authors and Affiliations

  1. Baranov Central Institute of Aviation Motors (CIAM), ul. Aviamotornaya 2, Moscow, 111116, Russia

    S. Yu. Krasheninnikov, A. K. Mironov, D. E. Pudovikov & P. D. Toktaliev

Authors
  1. S. Yu. Krasheninnikov
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  2. A. K. Mironov
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  3. D. E. Pudovikov
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  4. P. D. Toktaliev
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Correspondence to S. Yu. Krasheninnikov.

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Original Russian Text © S.Yu. Krasheninnikov, A.K. Mironov, D.E. Pudovikov, P.D. Toktaliev, 2015, published in Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, 2015, Vol. 50, No. 3, pp. 68–86.

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Krasheninnikov, S.Y., Mironov, A.K., Pudovikov, D.E. et al. Investigation of the generation of sound waves produced by turbulent jets. Fluid Dyn 50, 371–386 (2015). https://doi.org/10.1134/S0015462815030072

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