首页|Geometric and radiative characteristics of different flame patterns in fire whirl using 3D flame reconstruction
Geometric and radiative characteristics of different flame patterns in fire whirl using 3D flame reconstruction
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NETL
NSTL
Elsevier
This paper presents an experimental study on the geometric and radiative characteristics of the different flame patterns in fire whirl within a wide range of the imposed circulations (F) based on the 3D visual hull reconstruction algorithm. The results showed that with increasing F, the mean flame volume decreases steadily for the weak and conical fire whirls, and increases significantly for the cylindrical fire whirl. In contrast to the weak and conical fire whirl, the centerline flame temperature and the external radiative heat flux of the cylindrical fire whirl decrease and increase steadily with F, respectively. The calculated mean flame emissivity and radiation fraction, based on 3D flame model, are found to decrease steadily with increasing F for the weak and conical fire whirls, and increase monotonically for the cylindrical fire whirls, with the maximum flame emissivity of 0.251 and the maximum radiation fraction of 0.703, 2.46 times and 2.79 times of the free buoyant flame, respectively. This indicates that the thermal hazard of cylindrical fire whirls is enhanced significantly compared to the other flame patterns. The variation of the soot volume fraction with F was elucidated physically according to the turbulent mixing concept.
Fire whirlFlame patternsFlame surface areaFlame volumeFlame emissivityRadiation fractionTURBULENT-DIFFUSION FLAMESTHERMAL-RADIATIONPOOL FIRESTEMPERATUREENTRAINMENTEMISSIONSVELOCITY
NETL
NSTL
Elsevier
