平板障碍物通道形状对油气爆炸传播特性影响  

Effects of flat obstacle channel shapes on characteristics of gasoline-air explosion

作　　者：李国庆 杜扬 白洁 武军 李孟源 吴晓澍 朱亮 LI Guoqing;DU Yang;BAI Jie;WU Jun;LI Mengyuan;WU Xiaoshu;ZHU Liang(The 63926 Army,Beijing 100192,China;Department of Petroleum Supply Engineering,Army Service University,Chongqing 401311,China;Donglian School,Ordos 017099,Inner Mongolia,China)

机构地区：[1]63926部队,北京100192 [2]陆军勤务学院油料系,重庆401311 [3]东联学校,内蒙古鄂尔多斯017099

出　　处：《化工学报》2020年第4期1912-1921,共10页CIESC Journal

基　　金：国家自然科学基金项目(51276195,51704301);国家社会科学基金项目(2019-SKJJ-C-041)。

摘　　要：为研究平板障碍物通道形状对油气爆炸特性的影响,进行了1.3%(低)、1.7%(中)、2.1%(高)三种初始油气浓度工况下对比实验。研究表明:障碍物通道形状对油气爆炸超压随时间变化规律的影响较小;障碍物通道形状对最大爆炸超压峰值、最大升压速率、平均升压速率的影响程度分别按照通道形状为“梯形-圆形-三角形-正方形-矩形”、“梯形-圆形-三角形-正方形-矩形”、“梯形-圆形-正方形-三角形-矩形”的顺序递增;障碍物通道形状对障碍物上游火焰形态基本没影响,但矩形通道障碍物对障碍物下游火焰的湍流特性影响最显著,其次为正方形、梯形、三角形和圆形;初始油气浓度接近当量比时(约为1.7%),障碍物通道形状对最大火焰传播距离和平均火焰传播速度的影响要小于低浓度(1.3%)和高浓度(2.1%)工况,且圆形通道平板障碍物的影响程度最小,矩形和正方形通道的影响程度相对较大。To study the influence of the shape of flat obstacle channel on the characteristics of gasoline-air explosion,a comparison experiment was performed under three initial gasoline vapor concentration conditions of 1.3%(low),1.7%(medium),and 2.1%(high).The results show that:the shape of obstacle channel has little effect on the evolution of overpressure time series curve of gasoline-air explosion.The effect of obstacle channel shape on the peak value of maximum overpressure,the maximum rate of pressure rise and the average rate of pressure rise is increased in the order of“trapezium-circular-triangle-square-rectangle”,“trapezium-circular-triangle-square-rectangle”and“trapezium-circular-square-triangle-rectangle”,respectively.The shape of the obstacle channel has little effect on the upstream flame shape of the obstacle,but the rectangular channel has the most significant effect on the turbulence characteristics of the downstream flame of the obstacle,followed by the square,trapezoid,triangle and circle,respectively.The effect degree of obstacle channel shape on the maximum flame propagation distance and average flame propagation velocity under the initial gasoline vapor concentration of 1.7%,which is close to the equivalence ratio,is smaller than that of low concentration(1.3%)and high concentration condition(2.1%),and the influence degree of circular channel plate obstacle is the smallest,while that of rectangular and square channel is relatively larger.

关 键 词：障碍物通道形状 油气爆炸 爆炸超压 升压速率 火焰传播 

分 类 号：X932[环境科学与工程—安全科学]