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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.376 SNIP: 0.466 CiteScore™: 0.83

ISSN Print: 2151-4798
ISSN Online: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/SpecialTopicsRevPorousMedia.v2.i2.30
pages 91-100

VALIDATION OF A SUBGRID MODEL FOR POROUS BURNERS SIMULATIONS

Fernando Pereira
Universidade Federal de Santa Catarina; Departamento de Engenharia Mecanica, Universidade Federal do Rio Grande do Sul, 90050-170 Porto Alegre, RS
Amir A. M. Oliveira
University of Michigan Ann Arbor, MI 48109-2125; Federal University of Santa Catarina, Department of Mechanical Engineering, LabCET -Laboratory of Combustion and Thermal Systems Engineering, 88040-900, Floriano'polis, SC, Brazil
Fernando F. Fachini
Grupo de Mecanica de Fluidos Reativos, Laboratorio de Combustao e Propulsao, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, Sao Paulo 12630-000, Brazil

ABSTRACT

A subgrid model for the flame speed is proposed for the simulation of flow and reaction in porous inert media. The subgrid model relies on the asymptotic structure of the flame presented in a previous work. The asymptotic results are used to build a microscale model for the flame speed as function of the heat recirculation efficiency of the burner. Then a macroscale model is formulated with the volume-averaged conservation equations and a kinematic equation to describe the movement of the flame front (level-set method). Results of a 1D simulation of a porous radiant burner are presented to illustrate the method and the model limitations are evaluated. Results show that the proposed model is able to connect the subgrid model with the large-scale problem with heat losses and that better results are obtained when sufficient scales separation is achieved. Multidimensional implementation is also discussed.


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