On Two Mechanisms of Sound Generation in Turbulent Jets
| Autor: | S. Yu. Krasheninnikov, P. A. Semenev |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Fluid Flow and Transfer Processes Physics Jet (fluid) Computer simulation Turbulence Mechanical Engineering General Physics and Astronomy Experimental data Turbulence theory Mechanics 01 natural sciences Sound generation Jet noise 010305 fluids & plasmas Physics::Fluid Dynamics Noise 0103 physical sciences |
| Zdroj: | Fluid Dynamics. 54:614-628 |
| ISSN: | 1573-8507 0015-4628 |
| DOI: | 10.1134/s0015462819050069 |
| Popis: | Features of the processes of sound generation in turbulent jet flows are analyzed. Two possible processes are considered, namely, noise of dissipating turbulence and noise generated by largescale turbulent-flow perturbations which accompany propagation of turbulent jets. The data of the theoretical and experimental investigations of statistical turbulence theory are used to estimate the first of the above-mentioned effects. The data of computational experiments are used to analyze the process of sound generation by large-scale perturbations. In these numerical experiments time-dependent subsonic turbulent jet flows were directly calculated using the LES technology and the experimental data. It is shown that the noise of large-scale perturbations can be satisfactorily reproduced by the numerical simulation and its properties correspond to the experiments on studying sound generation in jets; the contribution of noise of dissipating turbulence to the total jet noise seems to be insignificant. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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