Simulating Vented Maize Starch Explosions in a 236 m3 Silo

T. Skjold
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引用次数: 5

Abstract

The paper describes computational fluid dynamics (CFD) simulations of a series of large-scale dust explosion experiments performed in a 236-m 3 silo. Mechanical suspensions were generated by pneumatically injecting maize starch into a 22 m high silo. The experiments included tests with injection from the bottom and from the top of the silo, but the present study only considers bottom injection. The clouds were ignited at various heights above ground. The same experiments have been simulated previously, but the current work involves an updated version of the CFD code and explores the effect of grid resolution on the simulation results. The results from the simulations are in good agreement with the experimental data, and confirm the observation that the reduced explosion pressure in long slender silos is very sensitive to ignition location. The simulation results highlight the effect of dust distribution within the silo, and reproduce the characteristic pressure oscillations, with frequency in the range 4-7 Hz, observed in some of the tests.
在236立方米筒仓中模拟玉米淀粉爆炸
本文描述了在一个236米的筒仓中进行的一系列大规模粉尘爆炸实验的计算流体力学(CFD)模拟。机械悬浮液是通过将玉米淀粉气动注入22米高的筒仓而产生的。试验包括筒仓底部和筒仓顶部喷注试验,但本研究只考虑筒仓底部喷注。云层在地面的不同高度被点燃。同样的实验以前已经模拟过,但目前的工作涉及CFD代码的更新版本,并探索网格分辨率对模拟结果的影响。模拟结果与实验数据吻合较好,证实了细长筒仓的降爆压力对点火位置非常敏感。模拟结果突出了筒仓内粉尘分布的影响,重现了部分试验中观察到的特征压力振荡,频率范围在4-7 Hz。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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