Vorticity dynamics in three-dimensional pulsating co-flowing jet diffusion flames

Lasheras, Juan C. and Liñán Martínez, Amable and Lecuona Newman, Antonio and Rodríguez Aumente, Pedro A. (1992). Vorticity dynamics in three-dimensional pulsating co-flowing jet diffusion flames. In: "Symposium (International) on Combustion (24. 1992. Sydney)", 5-10 Jul 1992, Sydney. ISBN 0082-0784.

Description

Title: Vorticity dynamics in three-dimensional pulsating co-flowing jet diffusion flames
Author/s:
  • Lasheras, Juan C.
  • Liñán Martínez, Amable
  • Lecuona Newman, Antonio
  • Rodríguez Aumente, Pedro A.
Item Type: Presentation at Congress or Conference (Article)
Event Title: Symposium (International) on Combustion (24. 1992. Sydney)
Event Dates: 5-10 Jul 1992
Event Location: Sydney
Title of Book: Twenty-Fourth Symposium (International) on Combustion
Date: 1992
ISBN: 0082-0784
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The vorticity dynamics in the near field of laminar (Re = 103) co-flowing jets subjected to the single or combined effeets of axial and azimuthal forcing is analyzed. It is shown that the interaction of the three-dimensional vortex structure resulting from the growth of the two and three-dimensional instabilities may result in large changes in the entrainment and mixing characteristics of the jet. For each azimuthal forcing, and for a fixed velocity ratio between the inner and outer jet, we show the existence of several instability modes leading to a pattern of lateral ejections of closed vortex loops. These modes and their topological changes are analyzed in view of the three-dimensional inviscid induction of the two concentric array of vortex rings emanating from the j e t s exit nozzle. For the case of methane-air diffusion flames, fiow visualizations revealed the existence of qualitatively similar patterns of closed fíame cells and fingers.

More information

Item ID: 1293
DC Identifier: http://oa.upm.es/1293/
OAI Identifier: oai:oa.upm.es:1293
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 12 Jan 2009
Last Modified: 20 Apr 2016 06:46
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