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NUMERICAL STUDY OF FORWARD SMOLDERING COMBUSTION (in Spanish)

  • Author(s): Rein, Guillermo
  • Torero, Jose Luis
  • Ellzey, Janet L.
  • et al.
Abstract

(in English) Abstract

This paper presents the results from the numerical study of the forward smoldering combustion process. The study is based on the transient model developed at University of Texas at Austin but extended with some modifications. In the model, the equations of conservation of energy and mass are solved. The chemistry is represented by a simplified scheme which consists of three reactions. Equations are discretized in space and solved in time. Neither thermal nor chemical equilibrium between solid and gas phases is assumed. The more important extensions made to the original model are: radiation heat transfer is included, a new ignition process is implemented and the porous structure of the solid is reconsidered. The extensions to the original model were implemented in order to predict the experimental data. The model with its extensions has been calibrated at a higher inlet air velocity and validated. The results show that the model predicts reasonably well the velocity of propagation of the smoldering front.

(in Spanish) Estudio numerico de combustion latente en flujo directo

Resumen

Este articulo presenta los resultados del estudio numerico del proceso de combustion latente en flujo directo. La combustion latente es una reaccion exotermica sin llama que se propaga en combustibles porosos. El estudio se basa en el modelo transitorio desarrollado en la Universidad de Texas en Austin, pero ampliado con varias modificaciones. En el modelo se resuelven las ecuaciones de conservacion de la energia y la masa. La cinetica quimica se modela con un esquema simplificado de tres reacciones. Las ecuaciones diferenciales se discretizan en el espacio y se resuelven en funcion del tiempo. El modelo no fuerza el equilibrio ni termico ni quimico entre las fases solida y gaseosa. Las modificaciones mas importantes realizadas son la inclusion de la transmision del calor por radiacion, la incorporacion de un nuevo proceso de ignicion y la reconsideración de la microestructura de los poros del solido. El objetivo de las ampliaciones es completar y adaptar el modelo a los experimentos publicados para comparar resultados. El modelo se calibra de nuevo a una velocidad mayor del aire de entrada. Los resultados muestran que se estima adecuadamente la velocidad de propagacion del frente de combustion.

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