One of the most destructive forces in large urban forces is theoccurrence of fires whirls. Despite the relatively recent experimental andnumerical simulation studies on the global behaviors of small-scale whirlingfires, much of the whirling fire phenomena still remain unknown. Thepurpose of this experimental study is to examine closely the detailedstructures of the velocity and temperature fields in a stable whirling flamegenerated in a vertical square channel with symmetrical comer gaps by bothphysical measurements using conventional means and by quantitativeobservations using both a high-speed motion camera and a thermographicinfrared camera. The results showed a rather complex non-uniform velocityand temperature field in the lower half of the whirling flame and couldprovide an important basis to validate the fire field models for the study ofreal large-scale fire whirls.
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