置障管道内气体组分对甲烷 / 氢气爆燃特性的影响研究^∗

To investigate the impact of gas composition on the explosion characteristics of methane-hydrogen mixtures, experiments were conducted in a sealed pipe fitted with ring-shaped obstacles. This study aimed to analyze how varying hydrogen mixing ratios (ranging from 0 to 100%) and equivalence ratios affect the deflagration process of these mixtures, with the goal of uncovering patterns in how these factors influence key explosion parameters. The results demonstrated that adding hydrogen significantly influences the explosion overpressure within a sealed pipe. As the hydrogen ratio increases, there is a general upward trend in the maximum explosion overpressure recorded at various pressure measurement points inside the pipe. However, when the hydrogen ratio rises from 30% to 70%, the rate of increase stabilizes. The variation in explosion overpressure in relation to the hydrogen ratio can be divided into three distinct phases: rapid, gradual, and another rapid increase. Similar trends were observed for the maximum rates of pressure rise and shock wave propagation. At an equivalence ratio of 1, the peak values of these parameters increased with higher hydrogen ratios. Specifically, increasing the hydrogen ratio to 30%, 50%, 70%, and 100% resulted in corresponding increases in peak overpressure of 36. 47%, 0. 84%, 4. 64%, and 47. 56%, respectively. The peak pressure rise rate demonstrated even more pronounced increases, rising by 28. 98%, 5. 11%, 10. 71%, and 81. 50% for the same hydrogen ratios. Similarly, the peak shock wave propagation velocity increased by 6. 65%, 0. 85%, 4. 97%, and 34. 31% for the respective hydrogen ratios. These findings highlight the significant role of hydrogen in enhancing the explosion parameters of methane-hydrogen mixtures. At the same hydrogen mixing ratio, the order of peak explosion overpressure, maximum pressure rise rate, and shock wave propagation velocity in methane-hydrogen mixtures was observed as follows: equivalence ratio 1. 2 exhibited the highest values, followed by equivalence ratio 1. 0, and then equivalence ratio 0. 8.