Effects of pipe geometry and hydrogen concentration on flame quenching performance in crimped-ribbon flame arrester systems

The effects of the expansion chamber angle φ, the pipe bending angle Ø, and the pipe connection form PCF on the flame quenching performance within crimped-ribbon flame arrester FA pipe systems under varying initial hydrogen concentrations c₀ was investigated in this paper. The flame velocity V_f and explosion pressure P_f entering the FA, and the corresponding flame resistance results R_s were obtained. The results indicated that the interaction between c₀ and φ significantly influenced the flame propagation and explosion pressure wave evolution. The expansion chamber EC with φ = 30° exhibited the most effective attenuation on the flame propagation velocity. Furthermore, sharp-angled bends significantly impacted V_f and P_f, particularly at Ø = 30° and 45°. But the FA still had a significant attenuation effect on flame propagation after resistance failure. Notably, the explosion intensity in the Y-type pipe was the highest when the R-end was ignited and the B-end was flaming resistance (Y-R-B), while the explosion intensity in the T-type pipe was the lowest when the B-end was ignited and the R-end was flaming resistance (T-B-R). Importantly, the probability of flame resistance failure was notably reduced by 22 % in T-type pipe compared to Y-type pipe.