Using the Correlation Model of Random Quadrupoles of Sources to Calculate the Efficiency of Turbulent Jet Noise Screening with Geometric Diffraction Theory

Autor:	Georgy A. Faranosov, V. F. Kopiev, S. L. Denisov, Sergey Chernyshev, Nikolay Ostrikov
Rok vydání:	2020
Předmět:	010302 applied physics Diffraction Physics Acoustics and Ultrasonics Turbulence Screening effect 01 natural sciences Jet noise Computational physics Noise 0103 physical sciences Quadrupole Point (geometry) Sound pressure 010301 acoustics
Zdroj:	Acoustical Physics. 66:528-541
ISSN:	1562-6865 1063-7710
DOI:	10.1134/s1063771020050024
Popis:	The paper presents the results of a computational–experimental study of jet noise reduction using the screening effect. According to correlation theory, the noise sources of a single circular jet are represented by a set of uncorrelated quadrupoles. Using the basic relations of geometric diffraction theory (GDT), expressions are obtained for the sound field emitted by a point quadrupole source located near an acoustically rigid infinite half-plane. Using the expressions obtained in the framework of the GDT, the correlation model of the jet noise sources was adapted to the calculation of the sound field in the presence of a flat rectangular screen. A comparison of the calculated and experimentally measured spectra of sound pressure levels, performed at a given jet velocity and various screen positions, showed good qualitative, and for certain observation angles, quantitative agreement.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c1bd54efcf9647cceb34e477d9affb9 https://doi.org/10.1134/s1063771020050024 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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