化工学报2017，Vol.68Issue(8)：3310-3318,9.DOI:10.11949/j.issn.0438-1157.20161640
局部开口受限空间油气爆燃的超压瞬变与火焰行为
Overpressure transients and flame behaviors of gasoline-air mixture deflagration in confined space with local opening
摘要
Abstract
Experiments on gasoline-air mixture deflagration in the confined space with a local opening was carried out. Overpressure transients and flame behaviors under different concentration were acquired and the results showed that: there were two overpressure peaks inside the vessel but only one outside the vessel, and negative pressure zone was formed near the opening. The maximum value of internal and external overpressure were the same and both of them were caused by external deflagration. The value of overpressure peak showed the trend of first increasing and then decreasing with the increase of concentration, and the concentration corresponding to maximum overpressure peaks was 1.88%. The process of flame propagation could be divided into three stages, and the flame shape, color, duration of each stage, diameter of external fireball and average flame speed were dominated by initial concentration. With the increase of the concentration, the blue laminar flame with smooth front was changed into bright yellow flame with wrinkled front, and the duration of laminar propagating stage as well as accelerating and distorting stage showed the same trend of first increasing and then decreasing, but the duration of extinguishing stage showed a decreasing trend. The relationship between the diameter of fireball and concentration could be fitted by cubic polynomial, and the flame speed of 1stand 2nd stage could be fitted by quadratic polynomial. With the increase of opening ratio, the pressure peaks and flame speed of 2ndstage showed a decreasing trend, and the diameter of fireball showed a first increasing and then decreasing trend.关键词
局部开口/受限空间/油气/混合物/爆燃/实验验证Key words
local opening/confined space/gasoline-air/mixture/explosion/experimental validation分类
资源环境引用本文复制引用
王世茂,杜扬,李国庆,齐圣,王波,李阳超..局部开口受限空间油气爆燃的超压瞬变与火焰行为[J].化工学报,2017,68(8):3310-3318,9.基金项目
国家自然科学基金项目(51276195) （51276195）
重庆市研究生科研创新项目(CYB16128,CYB17150). supported by the National Natural Science Foundation of China (51276195) and the Graduate Research Innovation Project of Chongqing (CYB16128, CYB17150). （CYB16128,CYB17150）
