Modeling a fire whirl generated over a 5-cm-diameter methanol pool fire
Modeling a fire whirl generated over a 5-cm-diameter methanol pool fire
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DOI：
10.1016/j.combustflame.2009.06.010
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发表时间：
2009-09
影响因子：
4.4
通讯作者：
K. Chuah;K. Kuwana;Kozo Saito
中科院分区：
文献类型：
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作者：
K. Chuah;K. Kuwana;Kozo Saito
我们进行了一系列实验室规模的火旋实验，旋转直径 5 厘米的甲醇池火，并观察到与没有旋转的池火相比，火焰高度更长。进行了简单的比例分析，以获得轴向火焰高度对动量控制循环和浮力影响的依赖性。为了获得通过标度分析获得的参数的特定函数关系，我们开发了一个由耦合物质和能量方程以及火涡流产生的伯格斯涡流组成的分析模型。耦合方程的解表明，从火焰到燃料表面的平均传热速率是涡核半径的函数；较小的涡核半径向燃料表面提供更多的热量，增强蒸发，从而产生更长的火焰高度。这个新模型可以预测火焰高度和火焰形状。火焰高度预测与结垢分析和实验的结果相比较。
We conducted a series of laboratory-scale fire whirl experiments spinning 5-cm-diameter methanol pool fires and observed elongated flame height compared with the pool fire without spin. A simple scaling analysis was conducted to obtain dependency of the axial flame height on the momentum-controlled circulation and the effect of buoyancy. To obtain a specific functional relationship for the parameters obtained by the scaling analysis, we developed an analytical model consisting of coupled species and energy equations and Burgers vortex for circulation generated by a fire whirl. The solution of the coupling equations shows that the average rate of heat transfer from the flame to the fuel surface is a function of the vortex core radius; a smaller vortex core radius provides more heat to the fuel surface enhancing evaporation thereby producing the longer flame height. This new model predicts both flame height and flame shape. The flame height prediction compare favorably with results from the scaling analysis and experiment.