【摘要】 [目的]随着氢能的广泛使用，其安全性问题已经不容忽视。充分了解氢气在不同着火位置条件下的爆燃特性，是氢能船舶氢气安全使用及抗爆减灾设计的重要支撑。[方法]基于Open FOAM软件并使用LES模型，探究了半开敞管道内氢气在不同点火位置条件下的爆燃火焰动力学特性。[结果]研究结果表明：点火位置对氢气爆燃的火焰传播速度和爆燃压力有着显著的影响。在不同点火位置条件下，火焰结构的动态演化过程均可以分为3个阶段：球形火焰阶段、指形火焰阶段和射流火焰阶段。其中对于着火点最靠近障碍物的工况还存在明显的漩涡火焰阶段。障碍物必然会导致火焰加速传播、爆燃超压迅速上升，其中着火位置(0.050, 0.050, 0)、(0.050, 0.050, 0.125)和(0.050, 0.050, 0.250)工况下的火焰速度峰值分别为210 m/s、185 m/s和170 m/s，爆炸压力峰值分别为66.0 kPa、55.7 kPa和49.7 kPa。火焰结构的演化与火焰面的行为受到未燃气体流场的影响。[结论]研究成果为氢能设备的安全设计和布置提供了理论基础，并为氢气爆炸的抗爆减灾设计提供理论支撑。更多还原

【Abstract】 [Purpose] With the expanding utilization of hydrogen energy, its safety concerns have become critical.Comprehensive understanding of hydrogen deflagration characteristics under varying ignition locations provides essential support for safety design and explosion mitigation in hydrogen-powered marine systems. [Method] Large eddy simulation(LES) through Open FOAM to investigate flame dynamics of hydrogen deflagration in semi-confined ducts with different ignition positions is employed. [Result] Key findings demonstrate significant ignition-position dependence on flame propagation velocity and overpressure. Flame structure evolution universally progresses through three phases: spherical flame, finger-shaped flame, and jet flame stages. Notably, scenarios with ignition points closest to obstacles exhibit an additional vortex-dominated flame phase. Obstacles inevitably induce flame acceleration and rapid overpressure rise, with peak flame velocities reaching 210 m/s, 185 m/s, and 170 m/s(at ignition coordinates(0.050, 0.050, 0),(0.050, 0.050, 0.125), and(0.050, 0.050, 0.250) respectively).Corresponding peak overpressures measure 66.0 kPa, 55.7 kPa, and 49.7 kPa. Flame front behavior shows direct correlation with unburned gas flow field characteristics. [Conclusion] The results establish theoretical foundations for safety-oriented hydrogen equipment design and explosion-resistant infrastructure planning. This work advances predictive capabilities for hydrogen explosion dynamics, particularly in obstacle-rich environments.更多还原