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On the role of radiation and dimensionality in predicting flow opposed flame spread over thin fuelsPublished in

2012

Volume: 16

Issue: 3

Pages: 537 - 569

In this work a flame-spread model is formulated in three dimensions to simulate opposed flow flame spread over thin solid fuels. The flame-spread model is coupled to a three-dimensional gas radiation model. The experiments [1] on downward spread and zero gravity quiescent spread over finite width thin fuel are simulated by flame-spread models in both two and three dimensions to assess the role of radiation and effect of dimensionality on the prediction of the flame-spread phenomena. It is observed that while radiation plays only a minor role in normal gravity downward spread, in zero gravity quiescent spread surface radiation loss holds the key to correct prediction of low oxygen flame spread rate and quenching limit. The present three-dimensional simulations show that even in zero gravity gas radiation affects flame spread rate only moderately (as much as 20% at 100% oxygen) as the heat feedback effect exceeds the radiation loss effect only moderately. However, the two-dimensional model with the gas radiation model badly over-predicts the zero gravity flame spread rate due to under estimation of gas radiation loss to the ambient surrounding. The two-dimensional model was also found to be inadequate for predicting the zero gravity flame attributes, like the flame length and the flame width, correctly. The need for a three-dimensional model was found to be indispensable for consistently describing the zero gravity flame-spread experiments [1] (including flame spread rate and flame size) especially at high oxygen levels (>30%). On the other hand it was observed that for the normal gravity downward flame spread for oxygen levels up to 60%, the two-dimensional model was sufficient to predict flame spread rate and flame size reasonably well. Gas radiation is seen to increase the three-dimensional effect especially at elevated oxygen levels (>30% for zero gravity and >60% for normal gravity flames). © 2012 Copyright Taylor and Francis Group, LLC.

Topics: Flame spread (67)%67% related to the paper, Zero gravity (60)%60% related to the paper and Gravity (chemistry) (51)%51% related to the paper

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About the journal

Journal | Combustion Theory and Modelling |
---|---|

ISSN | 13647830 |

Open Access | No |

Concepts (33)

- Dimensionality
- FINITE WIDTH
- FLAME ATTRIBUTES
- FLAME LENGTH
- FLAME SPREAD
- FLAME SPREAD RATE
- GAS RADIATION
- HEAT FEEDBACK
- LOW OXYGEN
- NORMAL GRAVITIES
- OPPOSED FLOW
- OPPOSED FLOW FLAMES
- OXYGEN LEVELS
- RADIATION LOSS
- SOLID FUELS
- Surface radiation
- THREE DIMENSIONAL EFFECT
- THREE DIMENSIONAL SIMULATIONS
- Three dimensions
- THREE-DIMENSIONAL MODEL
- Two dimensional model
- ZERO GRAVITY
- Experiments
- Forecasting
- Fuels
- Gases
- Heat radiation
- Oxygen
- Radiation
- Sailing vessels
- Three dimensional
- Two dimensional
- Flame research