Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.6/3685
Título: Aerodynamic control of the mixing of confined, plane and co-axial jets
Autor: Neves, Fernando Manuel da Silva Pereira das
Orientador: Barata, Jorge Manuel Martins
Palavras-chave: Jactos coaxiais - Comportamento aerodinâmico
Turbulência
Jactos coaxiais confinados
Fluxo de recirculação - Controlo aerodinâmico
Data de Defesa: 2012
Resumo: Turbulent mixing of confined coaxial jets is a complex dynamic process with many practical applications such as ejectors, jet pumps, industrial burners, jet engine combustion chambers, gaseous nuclear rockets, mixing chambers, afterburners, and turbofan engine mixing chambers. In this latter applications the confinement is also of basic interest because it involves a certain interacting turbulent flow phenomena, the details of which are not yet fully understood quantitatively (Ahmed and Sharma, 2000). There have been studies of different geometric and operating parameters on the turbulent mixing process of confined coaxial jets with different motivations. While a wide range of diameter ratios has been investigated in the past, no work was reported on diameter ratios below 2, which is the case with many low bypass turbofan engines with bypass ratios of 0.3 and less. Only Ahmed and Sharma (2000) reported recently detailed LDV measurements of mean and turbulence components of velocity as well as the total and static pressures over a range of velocity ratios with relevance in the present context. In their work they analyse the influence of velocity ratio on the turbulent mixing process, but there are many other parameters which influence the turbulent mixing process. This research is dedicated to the study of the turbulent mixing of parietal jets without any generated effect of swirl and without the presence of bluff bodies. The major objective was to design mixing control strategies using purely aerodynamic tools. Following a work on axisymmetric geometries, a two-dimensional geometry was adopted to study the influence of geometric and initial parameters to control the flow: confinement, inclination angle and turbulence intensity of the outer flow.
URI: http://hdl.handle.net/10400.6/3685
Designação: Tese apresentada à Universidade da Beira Interior para a obtenção do grau de Doutor em Engenharia Aeronáutica
Aparece nas colecções:FC - DF | Dissertações de Mestrado e Teses de Doutoramento

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