化工进展2018，Vol.37Issue(7)：2557-2564,8.DOI:10.16085/j.issn.1000-6613.2017-2522
含双侧分支结构受限空间油气泄压爆炸超压特性与火焰行为
Effects of bilateral branches structure on characteristics of gasoline-air mixtures explosion overpressure and flame behavior in a semi-confined space
摘要
Abstract
In order to investigate the overpressure characteristics and flame behavior of gasoline-air mixtures explosion in a semi-confined space with double side branches structure,the explosion overpressure peaks in straight and bilateral branches pipes under different initial gasoline-air mixtures concentrations were studied. Semi-open plexiglass pipes were used to visualize the flame propagation behavior. Results showed that:①there existed three typical pressure peaks denoted as p1、p2 and pmax during the gasoline-air mixture explosions in the semi-open pipe and the magnitude of p1 was just associated with the fracture constant of the polyethylene film at the pipe exit and p2 was related to branch pipe pressure relief while pmax was affected by the intensity of explosion inside the pipe and flame acceleration. ②The branch pipe has an intensive effect on the explosion strength. With the increase of gasoline-air mixtures concentration,the strengthening effect firstly increases and then decreases,and the strengthening effect is most intense at the concentration of 1.4% to 1.8%. ③The flame occurs at the branch structure with significant bending and folding,which increases the flame area,increases the combustion rate,accelerates the heat transfer efficiency of the flow field,induces the sharp increase of explosion intensity,and at the same time,the flame propagation speed and the maximum flame front position are increased. ④The flame presents a "hemispherical flame——fingertip flame——planar flame——spray flame" morphology changes in the pipe containing the bilateral branch structure.关键词
油气爆炸/爆炸超压/火焰速度/分支结构/混合物Key words
gasoline-air explosions/explosion overpressure/flame speed/branch structure/mixtures分类
资源环境引用本文复制引用
杜扬,李蒙,李国庆,王世茂,张培理,齐圣,韦世豪..含双侧分支结构受限空间油气泄压爆炸超压特性与火焰行为[J].化工进展,2018,37(7):2557-2564,8.基金项目
国家自然科学基金(51276195)及重庆市研究生科研创新项目(CYB17150). （51276195）
