The role of separation of scales in the description of spray combustion

Sánchez, Antonio L. and Urzay, J. and Liñán Martínez, Amable (2015). The role of separation of scales in the description of spray combustion. "Proceedings of the Combustion Institute", v. 35 ; pp. 1549-1577. ISSN 1540-7489. https://doi.org/10.1016/j.proci.2014.08.018.

Description

Title: The role of separation of scales in the description of spray combustion
Author/s:
  • Sánchez, Antonio L.
  • Urzay, J.
  • Liñán Martínez, Amable
Item Type: Article
Título de Revista/Publicación: Proceedings of the Combustion Institute
Date: 2015
ISSN: 1540-7489
Volume: 35
Subjects:
Freetext Keywords: Separation of scales; Spray combustion; Liquid-fueled propulsion; Multiphase flows
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Mecánica de Fluidos y Propulsión Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The present paper deals with the description of the interacting multiscale processes governing spray vaporization and combustion downstream from the near-injector atomization region in liquid-fueled burners. One of the main objectives is to emphasize the progress made in the mathematical description and understanding of reactive spray flows by incorporation of rationally derived simplifications based on the disparity of length and time scales present in the problem. In particular, we aim to show how the disparity of the scales that correspond – with increasing values of their orders of magnitude – to the droplet size, interdroplet spacing, and width of the spray jets, ensures the validity of their homogenized description. The two-way coupling associated with exchanges of mass, momentum, and energy between the gas and the liquid phases is dominated by the homogenized exchanges with the gas provided collectively by the droplets, and not by the direct interaction between neighboring droplets. The formulation is used as a basis to address nonpremixed spray diffusion flames in the Burke-Schumann limit of infinitely fast chemical reactions, with the conservation equations written in terms of chemistry-free coupling functions that allow for general nonunity Lewis numbers of the fuel vapor. Laminar canonical problems that have been used in the past to shed light on different aspects of spray-combustion phenomena are also discussed, including spherical spray clouds and structures of counterflow spray flames in mixing layers. The presentation ends with a brief account of some open problems and modeling challenges.

More information

Item ID: 40463
DC Identifier: http://oa.upm.es/40463/
OAI Identifier: oai:oa.upm.es:40463
DOI: 10.1016/j.proci.2014.08.018
Official URL: http://www.sciencedirect.com/science/article/pii/S1540748914004027
Deposited by: Memoria Investigacion
Deposited on: 22 Nov 2016 12:35
Last Modified: 22 Nov 2016 12:35
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