On the flame width of turbulent fire whirls

Lei, Jiao; Huang, Pengcheng; Liu, Naian; Zhang, Li Min

doi:10.1016/j.combustflame.2022.112285

Cited by 10 publications

(1 citation statement)

References 45 publications

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“…and analytical and experimental studies on the flame width of turbulent fire whirls [15]. Most of the above studies evaluated fire whirl characteristics such as flame height in terms of time averages.…”

Section: Introductionmentioning

confidence: 99%

Gas Temperature Distribution and Fluctuation in a Lab-Scale Fire Whirl

Watanabe¹,

Okamoto²

2023

JFCMV

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Fire whirls cause an increase in fire damage. This study clarified the unsteady behavior of fire whirls, considering that instantaneous changes in the temperature and flame shape of fire whirls can affect the damage to the surrounding area. Numerical simulations of a lab-scale flame that simulates a fire whirl were performed to investigate the changes in gas temperature and velocity fields under various fuel inflow velocities. The flow field was obtained by solving a continuity equation and a three-dimensional Navier-Stokes equation, and the turbulence was resolved using a large eddy simulation. A chemical equilibrium partially premixed combustion model was used, and radiation effects were considered. The time-averaged gas temperature distribution along the burner central axis revealed that the gas temperature decreased monotonically from upstream to downstream. The time-averaged velocity distribution along the burner central axis showed that the velocity decreased as one moved downstream, but the decrease was uneven. The time variation of the gas temperature demonstrated that the higher the fuel inflow velocity, especially near the burner, the greater the gas temperature flutter. Furthermore, the larger the fuel inflow velocity, the larger the flame swell and wobble. The results showed that the fuel inflow velocity affected temperature fluctuation and flame undulating movement.

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Section: Introductionmentioning

confidence: 99%