Turbulent Diffusion Flames with Large Buoyancy Effects
作者:
E. Gengembre,
P. Cambray,
D. Karmed,
J. C. Bellet,
期刊:
Combustion Science and Technology
(Taylor Available online 1984)
卷期:
Volume 41,
issue 1-2
页码: 55-67
ISSN:0010-2202
年代: 1984
DOI:10.1080/00102208408923822
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In order to contribute to the modelling of room fires, experimental results are presented concerning turbulent diffusion flames obtained with a 30 cm diameter burner and corresponding to initial Froude number F in the range 2 × 10–6< F < 1.2 × 10–5, and calorific powersQin the range 16 kW <Q< 38 kW. The results concern main species mole fractions, temperature and flow velocity. The spectral analysis of the signal obtained by laser velocimetry shows that the flow is periodic or quasi-periodic in the lower part of the flame, where the quasi-totality of the combustion is achieved. Although thek-ε-gmodels imply a fully turbulent flow, the comparison of our experimental results with predictions based on the models developed by F. Tamanini shows that the Wallburn model gives a satisfactory approximation of the mean velocity distribution along the flame axis. However these models underestimate the lateral expansion of the flame.
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