Numerical Simulation of Premixed Methane–Air Explosion in a Closed Tube with U-Type Obstacles

Bin Hao, Jianfen Gao, Bingang Guo, Bingjian Ai, Bingyuan Hong and Xinsheng Jiang
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Bin Hao: National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhejiang Ocean University, Zhoushan 316022, China
Jianfen Gao: National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhejiang Ocean University, Zhoushan 316022, China
Bingang Guo: School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
Bingjian Ai: School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
Bingyuan Hong: National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhejiang Ocean University, Zhoushan 316022, China
Xinsheng Jiang: Department of Oil, Army Logistical University, Chongqing 401331, China

Energies, 2022, vol. 15, issue 13, 1-12

Abstract: Given the spatial structures and functional requirements, there are a number of different types of obstacles in long and narrow confined spaces that will cause a premixed gas explosion to produce greater overpressure and influence the flame behavior for different obstacles. Because the volume fraction of unburned gas changes with the changing height of the U-type obstacles, we can further study the influence on the volume fraction of the unburned premixed gas for the characteristics of the overpressure and the flame behaviors in the closed tube with the obstacles. The results show that after the premixed gas is successfully ignited in the pipe, the overpressure in the pipe greatly increases as the unburned premixed gas burns between the adjacent plates. Moreover, the increase of the overpressure in the closed duct becomes faster when the decrease of unburned gas becomes faster. The high-pressure areas between the plates move inversely compared with the direction of flame propagation when the height of the U-type increases, whereas the high pressure in the front of the flame moves further when the flame propagation passes all obstacles. In addition, the reversed flow structure of the flame is a coupling result for the overpressure caused by the flame propagation and the vortex between the plates. From the perspective of production safety, this study is a significant basic subject about the characteristics of overpressure and flame behaviors in a closed tube with obstacles.

Keywords: premixed methane-air; U-type obstacles; overpressure; the reverse flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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