Generally speaking, some characteristics describing the early stage of fire include: heat release, smoke release, flame spread, toxic effluents, melting and dripping. To study these characteristics, an experimental setup must first be established. This paper presents results of experiments and mainly discusses the increase in flame image area of a fire during its early stage. The analysis shows that the flame image area of a fire at an early stage increases continuously, and the increase rule can be described using a geometrical function.
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