| Whirl is a highly organized and intense combustion phenomenon induced by the coupling of fire plumes in forest and urban fires with the vortex field coupling of the surrounding environment,which releases huge heat to the environment and leads to an increase in the rate of fire spread,which brings great threat to the natural environment,human survival safety and property damage ultimately.A double-fire whirl is a special phenomenon of a fire whirl,which appears in the same space as two separate fire whirls,which not only gather a large amount of energy in an instant like a single-fire whirl,inducing catastrophic consequences,but also interact with each other.By studying the interaction law of double-fire whirl with variable height under quasi-steady state can further understand the pneumatic conditions produced by it,this paper analyzed the combustion law,laying a rich theoretical basis for predicting the fire behavior of the fire whirl under natural conditions,and making people aware of the hazards of such fires.In this paper,PyroSim is used to study the phenomenon of fire whirl caused by double oil plate numerically,and the working condition model obtained by changing the placement height of the oil plate and the edge length of the two plates is established,and the study is carried out on the rate of heat release,the rate of loss of fuel mass,the height of the fire whirl,the size of the vortex core,and the strength of the vortex core.Some qualitative analysis is carried out on the performance results between the two discs at different placement heights,and the results show that the change of the double disk placement height inhibits the thermal release rate,mass loss rate and velocity ring volume after combustion reaches quasi-steady state. |
