不同进气宽度和燃油盘直径对火涡燃烧特性影响的实验研究

IF 3 3区 农林科学 Q2 ECOLOGY
C. Ding, Lingfeng He, Zijian Yan, Yuyao Li, Shuangyang Ma, Yan Jiao
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引用次数: 0

摘要

火灾漩涡是一种独特的火灾行为,当火灾期间由于特定的周围温度和热梯度条件而产生垂直的火焰漩涡时就会发生。与传统的火羽相比,火涡具有更高的夹带率、切向速度和轴向速度,因此具有更大的危险性和破坏力。因此,研究火涡的燃烧特性是十分必要的。这个实验使用了一个小型的,固定框架的火漩涡发生器。研究了不同进气宽度和燃油盘直径对火涡燃烧特性的影响。实验图像表明,火焰旋涡的火焰高度与进气宽度呈负相关,与燃油盘直径呈正相关。结果表明:在准稳态燃烧阶段,随着进风口宽度的增大,火涡的燃烧速率先增大后减小,在进风口宽度为7 cm时达到峰值;结果表明,火焰旋涡的无因次火焰高度与过量温度呈幂律关系。最终,我们的结果表明,火焰漩涡的无因次放热率的2/5功率与无因次火焰高度呈正相关。最大火焰高度与平均火焰高度之比和平均火焰高度与连续火焰高度之比分别为1.35和1.5。值得注意的是,这些比率不受进气口宽度、燃油盘直径、环境温度和热量释放率的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Investigation on the Impact of Varying Air-Inlet Widths and Fuel Pan Diameters on Fire Whirls’ Combustion Characteristics
A fire whirl, a unique fire behavior, occurs when a vertical vortex of flames skyrockets due to specific surrounding temperatures and thermal gradient conditions during a fire. Compared with conventional fire plumes, fire whirls exhibit a higher air entrainment rate, tangential velocity, and axial velocity, thus presenting greater risks and destructive capabilities. Thus, studying the combustion characteristics of fire whirls becomes necessary. This experiment employed a small-scale, fixed-frame fire whirl generator. We investigated how varying air-inlet widths and fuel pan diameters influence the fire whirl’s combustion characteristics. Experimental images indicated a negative correlation between the fire whirl’s flame height and the air-inlet width, and a positive correlation with the fuel pan diameter. Our findings showed that the burning rate of the fire whirl during the quasi-steady-state combustion phase initially increased and then decreased as the air-inlet width expanded, peaking at a width of 7 cm. The data demonstrated a corresponding power-law relationship between the fire whirl’s dimensionless flame height and excess temperature. Ultimately, our results indicated a positive correlation between the 2/5 power of the fire whirl’s dimensionless heat release rate and the dimensionless flame height. The ratios of maximum to mean flame height and mean to continuous flame height are 1.35 and 1.5, respectively. Significantly, these ratios remain unaffected by the air-inlet width, fuel pan diameter, environmental temperature, and heat release rate.
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来源期刊
Fire-Switzerland
Fire-Switzerland Multiple-
CiteScore
3.10
自引率
15.60%
发文量
182
审稿时长
11 weeks
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