Turbulent Diffusion Flames with Large Buoyancy Effects

摘要: Abstract In order to contribute the modelling of room fires, experimental results are presented concerning turbulent diffusion flames obtained with a 30 cm diameter burner and corresponding initial Froude number F in range 2 × 10–6 < 1.2 10–5, calorific powers Q 16 kW 38 kW. The concern main species mole fractions, temperature flow velocity. spectral analysis signal by laser velocimetry shows that is periodic or quasi-periodic lower part flame, where quasi-totality combustion achieved. Although k-e-g models imply fully flow, comparison our predictions based on developed F. Tamanini Wallburn model gives satisfactory approximation mean velocity distribution along flame axis. However these underestimate lateral expansion flame.