Qiao Zhenglong, Li Yang, Miao Qianfei, Ma Heng, Xu Liang, Li Rong
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 5;10(32):35954-35964. doi: 10.1021/acsomega.5c03366. eCollection 2025 Aug 19.
This study systematically investigates the effects of porous obstacle blockage ratios on the explosion characteristics of CH/H mixtures in semiconfined pipelines through experimental methods. High-speed imaging and high-frequency pressure sensors were employed to simultaneously capture flame propagation dynamics and pressure field evolution. The results demonstrate that porous obstacles significantly alter flame propagation mechanisms. At blockage ratios exceeding 75%, flame acceleration becomes pronounced with propagation velocities increasing by 2-3 times, while flame fronts develop distinct turbulent characteristics. The overpressure evolution exhibits a three-stage pattern, reaching peak values at 87% blockage ratio before declining with further increases. Pressure waves display significant reflection and superposition effects near obstacles, with underpressure duration showing positive correlation with blockage ratio. A modified deflagration index model reveals maximum explosion hazard at 87% blockage ratio. These findings provide critical experimental evidence and theoretical support for safety design and explosion suppression in hydrogen-blended fuel pipeline systems.
本研究通过实验方法系统地研究了多孔障碍物阻塞率对半封闭管道中CH/H混合物爆炸特性的影响。采用高速成像和高频压力传感器同时捕捉火焰传播动力学和压力场演变。结果表明，多孔障碍物显著改变了火焰传播机制。当阻塞率超过75%时，火焰加速明显，传播速度增加2至3倍，同时火焰前沿呈现出明显的湍流特性。超压演变呈现出三个阶段的模式，在阻塞率为87%时达到峰值，之后随着阻塞率进一步增加而下降。压力波在障碍物附近表现出显著的反射和叠加效应，负压持续时间与阻塞率呈正相关。一个改进的爆燃指数模型表明，在阻塞率为87%时爆炸危险最大。这些发现为氢混合燃料管道系统的安全设计和爆炸抑制提供了关键的实验证据和理论支持。
