In the current study, numerical study of vented hydrogen explosions was performed utilizing computational fluid dynamics (CFD) software GASFLOW-MPI. A turbulent combustion model based on Schmidt correlation was formulated. Within this model, flame instabilities resulted from two intrinsic effects, Hydrodynamic instability, and Landau-Darrieus and Thermal-Diffusive instabilities were incorporated. The numerical simulation results revealed the mechanism of overpressure evolution inside and outside the vessel. Notably, the mechanism of the overpressure peak induced by the external explosion was revealed. The effects of turbulence models on overpressure time profiles were investigated. Moreover, it was determined that heat transfer, arising from thermal radiation and convection, exerts only a negligible influence on the maximum internal overpressure. Subsequently, the performance of GASFLOW-MPI in simulating vented hydrogen explosions for different ignition locations (center and rear ignitions) and varying hydrogen concentrations (22 %-38 %) was assessed against experimental data. Comparative analysis revealed a close agreement between the predicted results and experimental data. Furthermore, the competency of GASFLOW in simulating medium-scale vented hydrogen explosions was validated against experimental data.

中文翻译：

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排气氢气爆炸中外部爆炸的数值研究


在目前的研究中，使用计算流体动力学 （CFD） 软件 GASFLOW-MPI 对排气氢爆炸进行了数值研究。建立了基于 Schmidt 相关的湍流燃烧模型。在这个模型中，火焰不稳定性是由两个内在效应引起的，即流体动力学不稳定性，以及 Landau-Darrieus 和热扩散不稳定性。数值模拟结果揭示了容器内外超压演变的机制。值得注意的是，揭示了外部爆炸诱发的超压峰值的机制。研究了湍流模型对超压时间曲线的影响。此外，还确定了由热辐射和对流引起的传热对最大内部超压的影响可以忽略不计。随后，根据实验数据评估了 GASFLOW-MPI 在模拟不同点火位置（中心和后点火）和不同氢气浓度 （22 %-38 %） 的排气氢气爆炸方面的性能。比较分析显示预测结果与实验数据之间具有密切的一致性。此外，GASFLOW 在模拟中等规模排气氢气爆炸方面的能力也与实验数据进行了验证。