Qiao Zhenglong, Miao Qianfei, Li Yang, Ma Heng, Li Rong, Miao Xiaodou
College of Resource and Environment Engineering, Jilin Institute of Chemical Technology, Jilin, Jilin 132022, China.
Carbon Fiber Materials Research Institute, Jilin Institute of Chemical Technology, Jilin, Jilin 132022, China.
ACS Omega. 2025 Aug 13;10(33):37650-37663. doi: 10.1021/acsomega.5c04168. eCollection 2025 Aug 26.
This study investigates the effects of porous obstruction quantity on the explosion dynamics of CH/H hybrid fuel mixtures in semiconfined pipelines through integrated experimental and numerical approaches. High-frequency pressure transducers and ultrahigh-speed cameras were employed to record overpressure evolution and flame morphology, while numerical simulations incorporating the Charlette flame wrinkling model elucidated turbulence-flame interaction mechanisms. The study compared configurations with sequential porous obstructions to single-obstruction setups, revealing that obstruction number and blockage ratio critically govern flame speed, peak overpressure, and turbulent intensity. Under sequential-obstruction conditions, the flame transitions from laminar to turbulent after passing the first obstacle, exhibiting a 13.8-28.7% velocity enhancement. The second obstruction reduces turbulence effects, and suppression efficiency decays with increasing obstacle count. Overpressure analysis demonstrates that at an 87% blockage ratio, sequential obstructions elevate maximum overpressures at monitoring points PT1 and PT2 by 66.2 and 96.9%, respectively, compared to single-obstruction configurations. The deflagration index migrates toward ignition-adjacent regions, indicating enhanced explosion severity. Numerical validation confirms the Charlette model's precision in predicting flame front dynamics and capturing extreme flow-field variations (Mach number ≤1.00, vorticity peaks ≤40,000 s ) between obstacles. This work provides theoretical foundations for hydrogen-mixed gas explosion mitigation and pipeline safety design.
本研究通过综合实验和数值方法，研究了多孔障碍物数量对半封闭管道中CH/H混合燃料混合物爆炸动力学的影响。采用高频压力传感器和超高速摄像机记录超压演变和火焰形态，同时结合夏洛蒂火焰皱折模型的数值模拟阐明了湍流-火焰相互作用机制。该研究将具有连续多孔障碍物的配置与单障碍物设置进行了比较，发现障碍物数量和阻塞比严格控制着火焰速度、峰值超压和湍流强度。在连续障碍物条件下，火焰在通过第一个障碍物后从层流转变为湍流，速度提高了13.8%-28.7%。第二个障碍物降低了湍流效应，抑制效率随着障碍物数量的增加而衰减。超压分析表明，在阻塞比为87%时，与单障碍物配置相比，连续障碍物使监测点PT1和PT2处的最大超压分别提高了66.2%和96.9%。爆燃指数向点火附近区域迁移，表明爆炸严重性增加。数值验证证实了夏洛蒂模型在预测火焰前沿动力学和捕捉障碍物之间极端流场变化（马赫数≤1.00，涡度峰值≤40,000 s）方面的精度。这项工作为氢气混合气体爆炸缓解和管道安全设计提供了理论基础。
