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[1]杨昊燃,崔淦.多孔介质对高压氢气泄放自燃火焰传播的抑制模拟[J].油气储运,2025,44(05):1-12.
YANG Haoran,CUI Gan.Simulation study on the suppression of spontaneous flame propagation of high pressure hydrogen venting by porous media[J].Oil & Gas Storage and Transportation,2025,44(05):1-12.
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YANG Haoran,CUI Gan.Simulation study on the suppression of spontaneous flame propagation of high pressure hydrogen venting by porous media[J].Oil & Gas Storage and Transportation,2025,44(05):1-12.
多孔介质对高压氢气泄放自燃火焰传播的抑制模拟
《油气储运》[ISSN:1000-8241/CN:13-1093/TE]
卷:
44
期数:
2025年05期
页码:
1-12
栏目:
出版日期:
2025-05-25
- Title:
- Simulation study on the suppression of spontaneous flame propagation of high pressure hydrogen venting by porous media
- Keywords:
- Hydrogen vent; Flame quenching; Porous media; Numerical simulation
- 分类号:
- TE832
- 文献标志码:
- A
- 摘要:
- 【目的】为提高氢能使用的安全性，研究多孔介质对管内氢气泄放自燃火焰传播动力学的影响以及抑制过程。【方法】基于Ansys Fluent，采用大涡模拟模型、涡耗散概念模型、21步氢-空气详细化学反应机理及各向同性的多孔材料模型建立了带有多孔介质的高压氢气泄放管段数值模型。将模拟结果与前人所做研究相对比，保证数值模拟准确性与仿真结果可靠度。【结果】分析自燃火焰在管内与多孔介质区的压力变化可知，多孔介质对压力波具有一定的吸收作用，并且激波在进入多孔介质时会形成反射激波，反射激波会在多孔介质区域前相交干涉形成高压区。基于冷壁效应分析多孔介质内部温度变化，与普通管道相比，多孔材料管道的比表面积更大，这会导致火焰在多孔介质中传播时损失大量的热量。由OH自由基的浓度分布情况可知，OH自由基的浓度分布呈先增大后减小的趋势，在多孔介质的器壁效应下OH自由基活性降低，最终导致淬熄。氢气的泄放压力与多孔介质的孔隙率都会影响火焰在多孔介质内的淬熄距离，泄放压力越大，火焰的淬熄距离越长，并且孔隙率越大，多孔介质对火焰的抑制能力越弱。【结论】相关研究可为多孔介质的抑制机理探索、氢气泄放时自燃管内火焰的抑制与安全防护提供参考。
- Abstract:
- 【Objective】Hydrogen as an efficient and clean energy source, in order to improve the safety of hydrogen energy use, the influence of porous media on the propagation dynamics of spontaneous flame propagation of hydrogen venting in tubes and the suppression process are investigated. 【Methods】 A numerical model of a high-pressure hydrogen release tube section with a porous medium was established based on Ansys Fluent, using a large vortex simulation model, a vortex dissipation conceptual model, a 21-step hydrogen-air detailed chemical reaction mechanism, and an isotropic porous material model. The simulation results are compared with the experiments and simulations done by previous authors to ensure the accuracy of numerical simulation and the reliability of simulation results. 【Result】The analysis of the pressure change of spontaneous combustion flame in the tube and porous medium shows that the porous medium has a certain absorption effect on the pressure wave, and the reflected wave will be formed when the wave enters the porous medium, and the reflected wave will intersect and interfere to form a high pressure zone in front of the porous medium area. Based on the cold wall effect to analyse the temperature change inside the porous medium, the porous material has a higher specific surface area compared with ordinary pipes, which leads to a large amount of heat loss when the flame propagates in the porous medium. Analysing the concentration distribution of OH radicals, it can be seen that the concentration distribution of OH radicals shows a tendency to increase first and then decrease, and the OH radical activity decreases under the vessel wall effect of the porous medium, which ultimately leads to quenching. The release pressure of hydrogen and the porosity of the porous media will affect the flame quenching distance in the porous media, the larger the release pressure, the longer the flame quenching distance, and the larger the porosity, the weaker the porous media's ability to suppress the flame. 【Conclusion】The study has certain scientific significance for the inhibition mechanism of porous media, and the related research can provide reference for the inhibition of flame and safety protection in the spontaneous combustion tube of hydrogen release.
更新日期/Last Update:
2025-03-03