Abstract

In this work, the two dimensional transition of H₂-O₂ deflagration-to-detonation was examined in some porous closed-ducts by an in-house high speed reacting flow solver in OpenFoam package—a pressure-based/density-based hybrid solver coupled with Godunov-type schemes, including advection Upstream Splitting Method, Roe, Roe and Pike, and Harten-Lax-van-Leer-contact. Initially, the results of different reaction mechanisms were compared with experimental data. Then, some porous zones and wall roughness of porous duct as well as porous obstacles and their blockage ratio are applied to evaluate the DDT process in different working conditions. The results revealed that the addition of a porous zone could decrease the flame tip velocity and increase the maximum temperature of the process by up to 20.74%. Furthermore, the ratio of the wall roughness height to the channel width of 0.03 was found to be the optimal value to control the time and length of deflagration-to-detonation transition. Also, changes in the interval between the porous obstacles and their blockage ratio led to significant variations in the detonation flow structure. Finally, using a porous zone and porous obstacles have proved to be an advanced method to control the deflagration-to-detonation transition process.

摘要

_{在这项工作中，H 2} -O ₂的二维跃迁通过 OpenFoam 包中的内部高速反应流动求解器检查了一些多孔封闭管道中的爆燃到爆轰 - 一种基于压力/基于密度的混合求解器与 Godunov 型方案相结合，包括平流上游分裂法， Roe、Roe 和 Pike，以及 Harten-Lax-van-Leer-contact。最初，将不同反应机制的结果与实验数据进行了比较。然后，应用一些多孔区域和多孔管道的壁面粗糙度以及多孔障碍物及其堵塞率来评估不同工况下的滴滴涕过程。结果表明，增加多孔区可以降低火焰尖端速度并将过程的最高温度提高高达 20.74%。此外，壁面粗糙度高度与通道宽度之比为 0。发现 03 是控制爆燃到爆轰过渡时间和长度的最佳值。此外，多孔障碍物之间的间隔及其堵塞率的变化导致爆轰流结构的显着变化。最后，使用多孔区和多孔障碍物已被证明是控制爆燃到爆轰过渡过程的先进方法。