The effects of vortices on the propagation of acoustic waves are numerous, from simple convection effects to instabilities in the acoustic phenomena, including absorption,<p>reflection and refraction effects. This work focusses on the effects of mean flow<p>vorticity on the acoustic propagation. First, a theoretical background is presented<p>in chapters 2-5. This part contains: (i) the fluid dynamics and thermodynamics<p>relations; (ii) theories of sound generation by turbulent flows; and (iii) operators taken<p>from scientific literature to take into account the vorticity effects on acoustics. Later,<p>a family of scalar operators based on total enthalpy terms are derived to handle mean<p>vorticity effects of arbitrary flows in acoustics (chapter 6). Furthermore, analytical<p>solutions of Pridmore-Brown’s equation are featured considering exponential boundary<p>layers whose profile depend on the acoustic parameters of the problem (chapter 7).<p>Finally, an extension of Pridmore-Brown’s equation is formulated for predicting the<p>acoustic propagation over a locally-reacting liner in presence of a boundary layer of<p>linear velocity profile superimposed to a constant cross flow (chapter 8).<p> / Doctorat en Sciences de l'ingénieur / info:eu-repo/semantics/nonPublished
Identifer | oai:union.ndltd.org:ulb.ac.be/oai:dipot.ulb.ac.be:2013/209147 |
Date | 08 January 2015 |
Creators | Legendre, César |
Contributors | Migeot, Jean-Louis, Degrez, Gérard, Braga Campos, Luis, Mercier, Jean-François, Lielens, Grégory, Coyette, Jean-Pierre, Deraemaeker, Arnaud |
Publisher | Universite Libre de Bruxelles, Université libre de Bruxelles, Ecole polytechnique de Bruxelles – Mécanicien, Bruxelles |
Source Sets | Université libre de Bruxelles |
Language | English |
Detected Language | English |
Type | info:eu-repo/semantics/doctoralThesis, info:ulb-repo/semantics/doctoralThesis, info:ulb-repo/semantics/openurl/vlink-dissertation |
Format | No full-text files |
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