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通过在拉萨和合肥两地开展丙烷射流火实验,研究了两地湍流扩散射流火焰形态的不同,分析了低压低氧条件对火焰形态的影响机理。通过图像处理,得到了两地的火焰高度和火焰面积,并通过圆柱体假设,得到了等效的火焰宽度。研究结果表明,对于相同的燃料种类和喷嘴口径,当火源功率相同时,拉萨的火焰高度、火焰等效宽度和火焰面积比合肥的大。两地的火焰高度与火焰等效宽度的比值均为一常数,拉萨的数值略大于合肥,两地的均值约为13.8。
Through the experiment of propane jet fire in Lhasa and Hefei, the difference of flame shape of turbulent diffusive jet in two places was studied. The mechanism of the effect of low pressure and low oxygen on flame morphology was analyzed. Through the image processing, the flame height and the flame area of the two places are obtained, and the equivalent flame width is obtained through the cylinder assumption. The results show that for the same type of fuel and nozzle diameter, Lhasa’s flame height, flame equivalent width and flame area are larger than those of Hefei when the power of the fire source is the same. The ratio of the flame height to the flame equivalent width in both places is a constant. The value of Lhasa is slightly larger than that of Hefei, and the average value of the two places is about 13.8.