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首页> 外文期刊>Journal of loss prevention in the process industries >Simple method for predicting pressure behavior during gas explosions in confined spaces considering flame instabilities
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Simple method for predicting pressure behavior during gas explosions in confined spaces considering flame instabilities

机译：考虑火焰不稳定性的密闭空间瓦斯爆炸过程中预测压力行为的简单方法

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摘要

It is indispensable to predict the pressure behavior caused by gas explosions for the safety management against accidental gas explosions. In this study, a simple method for predicting the pressure behavior during gas deflagrations in confined spaces was examined. Previously the pressure behavior was calculated analytically assuming laminar flame propagation. However, the results of this method often provide underestimation compared with experimental data. It was known the underestimation intensifies as the scale of explosion spaces becomes larger. On the large scale gas deflagration, flame instability (especially hydrodynamic instability) might be more effective and wrinkles appeared on the flame front. Then, the flame surface area was increased and the propagating flame was gradually accelerated. The ordinary prediction methods led to the underestimation because the propagating flame was assumed to be laminar. In this study, we considered the effect of flame wrinkles caused by flame instabilities. By regarding the flame front as a fractal structure, the flame surface area could be modified. Because a flame surface starts to be wrinkled on a certain flame radius, proper determination of the critical flame radius provided accurate prediction of pressure behavior on a large scale deflagration. In addition, correction of the K_G value in a large vessel was discussed.
机译：为了安全管理意外气体爆炸，预测气体爆炸引起的压力行为是必不可少的。在这项研究中，研究了一种用于预测密闭空间内气体爆燃期间压力行为的简单方法。以前，假定层流火焰传播，通过分析计算压力行为。但是，与实验数据相比，该方法的结果经常被低估。众所周知，随着爆炸空间的规模变大，低估会加剧。在大规模的气体爆燃中，火焰不稳定（尤其是流体动力不稳定）可能会更有效，并且在火焰前部会出现皱纹。然后，增加了火焰表面积，并逐渐促进了传播的火焰。普通的预测方法导致了低估，因为假定正在传播的火焰是层流的。在这项研究中，我们考虑了由火焰不稳定性引起的火焰起皱的影响。通过将火焰锋视为分形结构，可以改变火焰表面积。由于火焰表面开始在特定的火焰半径上起皱，因此正确确定临界火焰半径可在大范围爆燃时提供准确的压力行为预测。另外，讨论了在大容器中的K_G值的校正。

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