摘要
为研究障碍物位置和油气浓度对油气爆炸特性影响,选取1.3%(低)、1.7%(危险浓度)和2.1%(高)三种初始浓度,进行了多工况油气泄压爆炸对比实验,主要结果为:(1)泄压爆炸超压曲线存在三个典型峰值,其中,泄压峰值pv大小与障碍物位置无关,负压峰值pneg的最大绝对值在障碍物与点火头的无量纲距离Li/L=0.4取得;最大超压峰值pmax最大值在Li/L=0.4取得(1.7%和2.1%工况),而1.3%工况在Li/L=0.6取得;(2)平均升压速率(dp/dt)ave、爆炸威力指数Emax、最大升压速率(dp/dt)max和最大爆炸指数Kmax的最大值均在Li/L=0.4取得;(3)在传播初期,火焰呈现较规则的"指尖形"形状,受障碍物扰动后,火焰锋面产生不规则变形,并在管道外部形成"蘑菇状"火焰,当Li/L=0.2时,"蘑菇状"火焰最明显;(4)最大火焰传播速度Sfmax在Li/L=0.2取得,并随着Li/L从0.2升至0.8时,单调递减。上述观测结果表明,障碍物位置和油气浓度对内置障碍物管道中油气爆炸特征参数均具有影响。
To investigate the effect of obstacle position and oil-gas concentration on characteristics of gasoline-air mixture explosion, a series of contrast experiments were conducted under the condition of three different initial gasoline vapor concentrations（1.3%, 1.7% and 2.1%） and different obstacle positions. The main observed results are：（1） Three typical peak values are observed in gasoline-air mixture explosion. The peak value of pressure relief pv is independent of obstacle position, while the maximum absolute value of negative pressure peak pneg is obtained when the dimensionless distance between the obstacle and the igniter head Li/L=0.4. In the condition of 2.1% concentration, the peak value of maximum overpressure pmax is obtained at Li/L=0.4, while under the condition of 1.3% concentration, it is obtained at Li/L=0.6.（2） The maximum values of average pressure boost rate（dp/dt）ave, index of explosive power Emax, maximum pressure boost rate（dp/dt）max and maximum explosion index Kmax are all obtained at Li/L=0.4 under the condition of three initial concentrations.（3） During the initial flame propagation process, it presents a ＂finger-like＂ shape, while after disturbance by obstacles, the flame fronts produce irregular deformations, a mushroom like flame is formed outside the pipe. When Li/L =0.2, mushroom like flames are most pronounced.（4） The maximum flame propagation velocity Sfmax is obtained at Li/L=0.2 which monotonously decreases with the increase of Li/L from 0.2 to 0.8. Above observation results show that both location of obstacles and initial oil gas concentration have an influence on the characteristic parameters of the gas explosion in the pipeline with built-in obstacles.
作者
李国庆
杜扬
齐圣
王世茂
张培理
韦世豪
李蒙
LI Guoqing;DU Yang;QI Sheng;WANG Shimao;ZHANG Peili;WEI Shihao;LI Meng(Department of Petroleum Supply Engineering, Army Logistics University of PLA, Chongqing 401311, China;62250 Troops, Geermu 816099, Qinghai, China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2018年第5期2327-2336,共10页
CIESC Journal
基金
国家自然科学基金项目(51276195)
国家自然科学基金青年科学基金项目(51704301)
重庆市研究生科研创新项目(CYB16128)
国防基金项目(3604031)
关键词
油气泄压爆炸
障碍物位置
爆炸超压
火焰速度
vented gasoline-air mixture explosions
obstacle position
explosion overpressures
flame speeds
