Study of the Peak Frequency in Turbulent Vortex Ring Noise

Autor:	I. V. Khramtsov, Vadim Palchikovskiy, Victor Kopiev
Rok vydání:	2019
Předmět:	010302 applied physics Physics Ring (mathematics) Acoustics and Ultrasonics Order (ring theory) Mechanics 01 natural sciences Vortex Vortex ring law.invention Piston law Condensed Matter::Superconductivity 0103 physical sciences Aeroacoustics 010301 acoustics Trajectory (fluid mechanics) Noise (radio)
Zdroj:	Acoustical Physics. 65:288-296
ISSN:	1562-6865 1063-7710
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f401a3d4f67eacf6877c9c611df3ffe8 https://doi.org/10.1134/s1063771019030035 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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