Confined swirling jets with large expansion ratios

Revuelta Bayod, Antonio; Sánchez Pérez, Antonio Luis y Liñán Martínez, Amable (2004). Confined swirling jets with large expansion ratios. "Journal of Fluid Mechanics", v. 508 ; pp. 89-98. ISSN 0022-1120.

Descripción

Título: Confined swirling jets with large expansion ratios
Autor/es:
  • Revuelta Bayod, Antonio
  • Sánchez Pérez, Antonio Luis
  • Liñán Martínez, Amable
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Fluid Mechanics
Fecha: 2004
Volumen: 508
Materias:
Palabras Clave Informales: : approximation theory; boundary layers; confined flow; integration; jets; laminar flow; vortices; confined swirling jets; expansion ratios; swirl numbers; four region asymptotic structure; nonswirling jet; axial velocity; azimuthal velocity; long recirculating eddy; azimuthal motion; point source; angular momentum flux; momentum equation; boundary layer approximation; numerical integrations; steady axisymmetric Navier Stokes equations; vortex breakdown
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Motopropulsión y Termofluidodinámica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

This paper presents the extension of our previous investigation of confined round jets with large Reynolds numbers and large expansion ratios (Revuelta, Sanchez & Linan 2002a) to the case of swirling jets with swirl numbers of order unity. In the absence of vortex breakdown, we encounter the four-region asymptotic structure identified earlier for the non-swirling jet, including a region of jet development where the azimuthal and axial velocity components are comparable. For the flow in the long recirculating eddy that forms downstream, where the pressure differences associated with the azimuthal motion become negligible, the jet is found to act as a point source with momentum flux equal to the flow force of the incoming jet, and angular momentum flux equal to that of the jet at the orifice. The solution for the weak circulation in this slender region, including the parameter-free leading-order description and the first-order corrections, is determined by integrating the azimuthal component of the momentum equation written in the boundary-layer approximation. The results are validated through comparisons with numerical integrations of the steady axisymmetric Navier-Stokes equations, which are also used to evaluate critical conditions for vortex breakdown

Más información

ID de Registro: 863
Identificador DC: http://oa.upm.es/863/
Identificador OAI: oai:oa.upm.es:863
URL Oficial: http://journals.cambridge.org/action/displayJournal?jid=FLM
Depositado por: Archivo Digital UPM
Depositado el: 22 Abr 2009
Ultima Modificación: 20 Abr 2016 06:34
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