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

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