Impact of particle diameter and thermal radiation on the explosion of dust layers
Impact of particle diameter and thermal radiation on the explosion of dust layers
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粒径和热辐射对粉尘层爆炸的影响
DOI：
10.1016/j.proci.2022.10.011
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发表时间：
2022
影响因子：
3.4
通讯作者：
Houim, Ryan W.
中科院分区：
文献类型：
--
作者：
Guhathakurta, Swagnik;Houim, Ryan W.
通过数值模拟研究了热辐射和颗粒直径对层状煤尘爆炸的影响。几何设置考虑了一个封闭的通道内的一个主爆炸与一层薄薄的煤尘的相互作用。模拟求解了耦合到欧拉颗粒多相模型的可压缩反应Navier-Stokes方程。采用滤波球谐近似法求解辐射传递方程，计算了热辐射。结果表明，辐射对粉尘爆炸的影响具有特定性。辐射可以促进、抑制或对爆炸影响很小，这取决于颗粒的直径。辐射对由直径为30和100 μ m的煤粒组成的粉尘层有轻微的抑制作用。当粒子直径为5 μ m时，辐射淬灭了爆炸。辐射促进了直径为150 μ m的较大煤颗粒的稳定燃烧，而不包括150 μ m直径煤颗粒的辐射的模拟产生了失败的爆炸。粉尘粒径对粉尘层扩散特性的影响对爆炸有重要影响。直径为5 μ m的小煤粒在冲击波的作用下分散性差，并且过于集中而不能燃烧。直径为150 μ m的大颗粒在通道中分散得更高，并显示出改善的混合，但具有抑制剧烈反应的大的热时间尺度。直径为30和100 μ m的颗粒的情况下，表现出良好的折衷之间的混合，混合，和热的时间尺度，产生稳定的燃烧，或不包括在模型中的热辐射。
Numerical simulations were performed to study the impact of thermal radiation and particle diameter on layered coal-dust explosions. The geometrical setup considered the interaction of a primary explosion with a thin layer of coal dust inside of a closed channel. The simulations solved the compressible reacting Navier–Stokes equations coupled to an Eulerian granular multiphase model. Thermal radiation was included by solving the radiation transfer equation using the filtered spherical harmonics approximation. The results show that the impact of radiation on the dust explosion is situation specific. Radiation can promote, inhibit, or have little impact on the explosion depending on the particle diameter. Radiation has a slight inhibiting effect on dust layers comprised of 30 and 100 μ m-diameter coal particles. Radiation quenched the explosion when particles were 5 μ m in diameter. Radiation promoted stable burning for larger 150 μ m-diameter coal particles, while simulations excluding radiation for 150 μ m-diameter coal particles produced a failed explosion. The influence of particle diameter on the dispersibility characteristics of dust layers has a significant impact on the explosion. Small 5 μ m-diameter coal particles are dispersed poorly by the leading shock and are too highly concentrated to burn. Large 150 μ m-diameter particles disperse higher into the channel and show improved mixing, but have large thermal time scales that inhibit vigorous reaction. Cases with 30 and 100 μ m-diameter particles show a good compromise between dispersibility, mixing, and thermal time scales which produce stable combustion with or without the inclusion of thermal radiation in the model.
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DOI：
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发表时间：
1986
期刊：
影响因子：
--
作者：
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通讯作者：
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DOI：
10.1016/j.jlp.2021.104509
发表时间：
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影响因子：
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作者：
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DOI：
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发表时间：
2015-07
影响因子：
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作者：
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DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
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DOI：
--
发表时间：
1988
期刊：
影响因子：
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作者：
J. Edwards;K. Ford
通讯作者：
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