Numerical simulation of small pool fires incorporating liquid fuel motion
Numerical simulation of small pool fires incorporating liquid fuel motion
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结合液体燃料运动的小型水池火灾的数值模拟
DOI：
10.1016/j.combustflame.2019.11.047
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发表时间：
2020
影响因子：
4.4
通讯作者：
Fukumoto K
中科院分区：
文献类型：
--
作者：
Fukumoto K
对于小规模的池火灾，Vali等人[1]显示了液体池中的一对旋涡。第一个漩涡出现在靠近容器侧壁的地方，第二个漩涡出现在稍微远离第一个漩涡的地方。利用FireFOAM软件对甲醇池火灾进行了大涡模拟，研究了甲醇池火灾与液体燃料对流的耦合过程。在这项研究中，一个三维液相模型是新开发的。该模型结合了热毛细Marangoni对流，浮力，剪切应力和蒸发的影响。对于气相，燃烧模型是扩展的涡耗散概念模型与层流燃烧模型耦合。该燃烧模型采用粘性扩散速率来考虑层流-湍流转捩。预测结果与实测的局部质量燃烧速率、火焰高度和液体温度分布相当吻合。质量燃速的误差在4%以内。目前的预测捕获了一对符合瓦利等人。的实验[1]。它们的尺寸随着液体温度的升高而增大。雷诺兹的类比可以解释这一趋势背后的合理原因。剪切力和热毛细力在液池中引起对流，这种对流形成一对旋涡。热毛细力的产生是由于对流换热和辐射换热的分布不同。各子模型对液相的敏感性试验表明，它们对质量燃速的影响均小于5.1%。相反，假设零重力仅在液相中的模拟导致质量燃烧速率几乎减少64%。
For small-scale pool fires, Vali et al. [1] showed a pair of vortices in the liquid pool. The first vortex appeared just close to the sidewall of the container, and the second one emerged slightly away from the first vortex. Large-eddy simulations of small methanol pool fires coupled with liquid fuel convective flow were conducted using an in-house version of FireFOAM to investigate the above phenomenon. In this study, a three-dimensional liquid phase model is newly developed. The model incorporates the effects of thermocapillary Marangoni convection, buoyancy, shear stress, and evaporation. For the gas phase, the combustion model is the extended eddy dissipation concept model coupled with the laminar combustion model. This combustion model uses the viscous diffusion rate to consider laminar-turbulent transition. The predictions were in reasonably good agreement with the measured local mass burning rate, flame height and distributions of liquid temperature. The error of the mass burning rate was within 4%. The present predictions captured a pair of vortices in line with Vali et al.'s experiment [1]. Their sizes increased with increasing the liquid temperature. The Reynolds analogy could explain the sensible reason behind this trend. Shear stress and thermocapillary force caused convection in the liquid pool, and this convection formed a pair of vortices. Thermocapillary force was due to the different distributions of convective and radiative heat transfer. Sensitivity test for sub-models for the liquid phase demonstrated that their effects on the mass burning rate were all less than 5.1%. Conversely, the simulation assuming zero gravity only in the liquid phase resulted in almost 64% reduction in the mass burning rate.
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DOI：
--
发表时间：
2004
期刊：
影响因子：
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作者：
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H. Koseki
DOI：
10.1016/j.jqsrt.2019.06.004
发表时间：
2019-09
影响因子：
2.3
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I. Sikic;S. Dembélé;J. Wen
DOI：
10.1063/1.857955
发表时间：
1991-07-01
期刊：
PHYSICS OF FLUIDS A-FLUID DYNAMICS
影响因子：
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GERMANO, M;PIOMELLI, U;CABOT, WH
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CABOT, WH
使用粒子图像测速技术表征小型水池火灾液相内的流场
DOI：
--
发表时间：
2016
期刊：
影响因子：
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作者：
Ali M. Vali;D. Nobes;L. Kostiuk
通讯作者：
L. Kostiuk
DOI：
--
发表时间：
2013
期刊：
影响因子：
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作者：
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通讯作者：
A. Trouvé