Geração de ruído por jatos turbulentos

• Ano de defesa: 1984
• Autor(a) principal: Musafir, Ricardo Eduardo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia Mecânica; UFRJ
• Palavras-chave em Português: Aeronaves; Acústica; Aerodinâmica de aeronaves; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::FENOMENOS DE TRANSPORTE::MECANICA DOS FLUIDOS
• Link de acesso: http://hdl.handle.net/11422/3704

A critical review of the principal theories of aerodynamical generation of sound and of some expansions for the source terms is presented. The principal properties of the flow and sound fields of a turbulent jet are commented. It is shown that, to obbey energy conservation, the shear noise/self noise model requires interference between the two types of terms to occur. The importance of source coherence in the sound field is discussed, and some evidences against this hypothesis are raised. Far field sound pressure correlations are examined and modelled in a very simple form. It is shown that experimental results agree with the hypothesis that turbulence, as anacoustic source, is equivalent to a distribution of lateral qui drupoles.