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Observations of flame behavior during flame‐obstacle interaction
Author(s) -
Fan Baochun,
Ying Zhanfeng,
Chen Zhihua,
Ye Jingfang
Publication year - 2008
Publication title -
process safety progress
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.378
H-Index - 40
eISSN - 1547-5913
pISSN - 1066-8527
DOI - 10.1002/prs.10223
Subject(s) - shadowgraph , acceleration , mechanics , obstacle , laminar flame speed , premixed flame , front (military) , materials science , flame front , turbulence , mechanical engineering , chemistry , engineering , physics , classical mechanics , combustor , organic chemistry , political science , law , combustion
A series of experiments have been performed to investigate the premixed flame behavior during its propagation in a rectangle chamber with various obstacles mounted on its wall. A high speed shadowgraph system was used to visualize the flame front development. Three different obstacles were used, and their corresponding sequential images are presented and used to quantify the shape and location of the flame front during its propagation. Our experimental results for flame acceleration showed similar results as the literature: the flame accelerates as it passes over the obstacles and then decelerates due to the existence of a recirculation zone behind the obstacles. However, significant changes in flame structures and turbulent transitions were found for the three different obstacles. It is found that the passage, which is composed of the surface shape of the obstacle and the inner wall of chamber, is critical to the shape of the flame front and propagation of the flame. The obstacle with the largest volume results in the fastest flame acceleration. © 2007 American Institute of Chemical Engineers Process Saf Prog, 2008