Abstract
This work presents a numerical study of laboratory fire whirls. The Reynolds Stress Transport turbulence model RST is used together with Eddy Break-Up combustion and radiation models. The unsteady 3D fire whirl prediction assume the same swirl generator used in the laboratory consisting on enclosure walls to constrict airflow to enter tangentially in the facility. A low momentum fuel jet is located at the bottom centre of two halves of an offset hollow cylinder. A detailed comparison between available experimental data and numerical predictions, ranging from 2 to 300 kW is presented. The results are in good agreement with the available experimental data. The flame height dependence on circulation was deduced using scaling laws and validated with experimental data. For each heat release considered, a critical circulation was found that results in a maximum flame height. Turbulence fields predictions are discussed in light of the role of turbulent suppression and Richardson parameters.
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