期刊
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
卷 67, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jlp.2020.104230
关键词
Explosion; Venting; Methane; Rich or lean mixtures; Flame dynamics
资金
- Alpha Foundation for the Improvement of Mine Safety and Health, Inc. [ASTI14FO-82]
- U.S. National Science Foundation (NSF) [1554254]
- West Virginia Higher Education Policy Commission [HEPC.dsr.18.7]
A series of experiments on explosion venting of methane-air mixtures are performed to scrutinize the pressure evolution as well as the flame dynamics and morphology at various vent conditions. Specifically, a premixed flame is ignited at the center of a polycarbonate cylindrical compartment, with three various vent areas considered (with negligible vent relief pressure). As expected, the highest maximum pressure is observed in the case of the smallest vent area. For all three cases, the pressure evolution experiences two major peaks, associated with the instants (i) when the maximum flame front surface area in the chamber is reached and (ii) when an external explosion occurs due to venting of unburned gases, respectively. For the fuel-rich mixtures, a flashback is observed subsequent to the external explosion, constituting the key outcome of the present work. The flame tip velocities show two general trends, namely, exponential acceleration towards the vent, while a flame propagates towards the blocked side of the compartment with no acceleration, which is important to know in the fire/explosion safety applications.
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