Experimental study on the buoyant turbulent diffusion flame height of various intermittent levels

Xiepeng Sun, Xiaolei Zhang, Jiang Lv, Xiaotao Chen and Longhua Hu

Applied Energy, 2023, vol. 351, issue C, No S0306261923010632

Abstract: This work studies the buoyant turbulent diffusion flame characteristics considering various flame intermittent levels and mean flame projection area. Although many investigations have been carried to reveal the mean flame height evolution of the buoyant turbulent diffusion flame, the turbulent diffusion flame height of various intermittent levels, occurs in the un-controllable (unplanned) fire accident (such as the gas fuel pipeline/tank leakage). The underlying evolutions of the buoyant turbulent diffusion flame with the heat release rate and intermittent levels have not been fully elucidated. Experiments are conducted by various burner dimensions under varied heat release rates. The flame geometries/heights at various intermittent levels are measured and quantified comprehensively by two cameras from the front- and side- view. It shows that the mean flame height declines as burner area/dimension increases. All experimental data for mean flame height in the present work and previous work are well correlated by the modified normalized heat release rate derived from the new characteristic length. Results also show that the flame height at various intermittent levels decreases with the intermittent level. A model of the flame heights at various intermittent levels is proposed considering the intermittent level and mean flame height to predict the experimental data in this work and previous work well. Finally, a flame projection area model is proposed based on the assumption of the isosceles triangle flame projection geometry. This work provides huge amount experimental data and prediction models to describe buoyant turbulent diffusion flame behaviours, which is meaningful for evaluating thermal failure probability and laying of gaseous fuel transportation pipelines.

Keywords: Buoyant turbulent diffusion flame; Flame height; Intermittent level; Characteristic length; Flame projection area (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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DOI: 10.1016/j.apenergy.2023.121699

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