Wang Fahui, Chen Jingning, Wen Xiaoping, Hu Qiang
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China.
ACS Omega. 2020 Nov 17;5(47):30495-30501. doi: 10.1021/acsomega.0c04346. eCollection 2020 Dec 1.
In this paper, the flame propagation characteristics and overpressure oscillation characteristics of CH explosion were studied under different ignition positions (IPs) and oxygen enrichment conditions in a half-open tube. The distances between the IP and the closed end of the tube are 0, 250, 500, and 750 mm. The oxygen enrichment coefficient (φ) values used in the experiment are 0.21, 0.3, and 0.4. The experimental results show that the IP and oxygen enrichment coefficient have an important influence on the flame structure and overpressure oscillation. Only when the oxygen enrichment coefficient φ = 0.21, a tulip flame will be formed. The IP close to the outlet can make the air participate in the combustion more quickly. With the increase of the oxygen enrichment coefficient, the combustion-induced rapid phase transition phenomenon is more likely to occur, and the maximum overpressure value and the overpressure rise rate of flame will increase. It is worth noting that after increasing the oxygen enrichment coefficient, the IP has less influence than the oxygen enrichment coefficient on the overpressure rise rate.
本文研究了在半开放管道中不同点火位置（IP）和富氧条件下CH爆炸的火焰传播特性和超压振荡特性。点火位置与管道封闭端之间的距离分别为0、250、500和750毫米。实验中使用的富氧系数（φ）值为0.21、0.3和0.4。实验结果表明，点火位置和富氧系数对火焰结构和超压振荡有重要影响。仅当富氧系数φ = 0.21时，才会形成郁金香火焰。靠近出口的点火位置可使空气更快地参与燃烧。随着富氧系数的增加，燃烧诱导的快速相变现象更易发生，火焰的最大超压值和超压上升速率将增大。值得注意的是，在增大富氧系数后，点火位置对超压上升速率的影响比富氧系数小。
