## Abstract

Surface burners are developed to reduce NO_{x} production related to combustion. This reduction is attained by lowering the flue-gas temperature using heat transfer from the flame to the burner. The optical thin limit and one dimensional (1D) spectral radiation models like wide and narrow band models have been utilized to model gas radiation in combustion studies. In the present work, it was shown that a large difference exists between these models because the optical thin limit neglects the effect of self-absorption of radiation by the hot flue gases. The 1D spectral radiation models over-predicted the self-absorption for burners of practical size. A numerical model for methane/air combustion was used to study the influence of the burner size on the self-absorption and thus, on the radiative heat loss. The actual heat loss could be computed using the optical thin limit for burners with less than 4 cm dia. The self-absorption became important for larger diameters. The limiting situation where the influence of self-absorption could be computed using 1D spectral radiation models was applicable for diameters larger than 40 cm. The radiative heat loss of the two dimensional simulations could be accurately described and a relation for the geometry factor was given for an equivalence ratio of 0.9.:1 This relation was independent of the gas inlet velocity and the height of the combustion chamber. Original is an abstract.

Original language | English |
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Title of host publication | Abstracts of symposium papers 28th International Symposium on Combustion : University of Edinburgh, Scotland, July 30 - August 4, 2000 |

Place of Publication | Pittsburgh |

Publisher | Combustion Institute |

Pages | 39 |

Number of pages | 1 |

Publication status | Published - 1 Jan 2000 |

Event | 28th International Symposium on Combustion - Edinburgh, United Kingdom Duration: 30 Jul 2000 → 4 Aug 2000 |

### Conference

Conference | 28th International Symposium on Combustion |
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Country | United Kingdom |

City | Edinburgh |

Period | 30/07/00 → 4/08/00 |