Predicting deflagration to detonation transition in hydrogen explosions
Predicting deflagration to detonation transition in hydrogen explosions
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DOI：
10.1002/prs.10242
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发表时间：
2008-09-01
影响因子：
1
通讯作者：
Hansen, Olav R.
中科院分区：
文献类型：
--
作者：
Middha, Prankul;Hansen, Olav R.
由于计算资源的发展，计算流体动力学（CFD）作为预测石油化工和过程工业事故后果的工具，近年来发挥了越来越重要的作用。CFD也越来越多地用于爆炸预测，作为风险评估和设计载荷规范的输入。CFD软件FLACS的开发和实验验证已经持续了超过25年。结果表明，该方法具有较好的模拟烃类气体爆燃的精度，在石油化工等领域得到了广泛的应用。在。近年来，人们对氢爆炸预测的关注越来越多，随着最新版本的发布，氢爆燃的验证状态被认为是良好的。然而，在许多这样的场景中。特别是涉及氢等反应性气体时，爆燃到爆轰过渡（DDT）可能是一个重大威胁。在以前的工作中，FLACS被扩展到确定在给定情况下是否可能发生滴滴涕，并指出可能发生滴滴涕的区域。滴滴涕的可能性已经用火焰前缘的空间压力梯度来表示。该参数能够可视化火焰前捕获压力的时间，这是在快速爆燃过渡到爆轰的情况下的情况。在爆炸压力、过渡时间等方面与实验观测结果基本一致。还有火焰速度。滴滴涕模型现已得到扩展，通过将几何尺寸与引爆池尺寸进行比较，制定出一种更有意义的标准来估计滴滴涕的可能性。本文讨论了预测DDT的新模型，并将预测结果与相关实验结果进行了比较。(c) 2007年美国化学工程师学会进程。
Because of the development in computational resources, Computational Fluid Dynamics (CFD) has assumed increasing importance in recent years as a tool for predicting the consequences of accidents in petrochemical and process industries. CFD has also been used more and more for explosion predictions for input to risk assessments and design load specifications. The CFD software FLACS has been developed and experimentally validated continuously for more than 25 years. As a result, it is established as a fool for simulating hydrocarbon gas deflagrations with reasonable precision and is widely used in petrochemical industry and elsewhere. in. recent years the focus on predicting hydrogen explosions has increased, and with the latest release the validation status for hydrogen deflagrations is considered good. However, in many of these scenarios. especially involving reactive gases such as hydrogen, deflagration to detonation transition (DDT) may be a significant threat. In previous work, FLACS was extended to identify whether DDT is likely in a given scenario and indicate The regions where it might occur The likelihood of DDT has been expressed in terms of spatial pressure gradients across the flame front. This parameter is able to visualize when the flame front captures the pressure from, which is the case in situations when fast deflagrations transition to detonation. Reasonable agreement was obtained with experimental observations in terms of explosion pressures, transition times. and flame speeds. The DDT model has now been extended to develop a more meaningful criterion for estimating the likelihood of DDT by comparison of the geometric dimensions with the detonation cell size. This article discusses the new models to predict DDT and compare predictions with relevant experiments. (c) 2007 American Institute of Chemical Engineers Process.