摘要
为探究爆炸腔内不同体积分数的瓦斯发生爆炸时的传播特征和90°弯管的泄爆特性,开展泄爆管为90°弯管的瓦斯泄爆试验,采用数值模拟与试验研究2种方法,分析爆炸冲击波在该系统中的传播过程,探究6组不同体积分数下的瓦斯爆炸冲击波、火焰大小变化特征。结果表明:爆炸冲击波在管道中传播为多次超压,其峰值超压逐渐减小;爆炸腔内的冲击波峰值超压及其上升速率变化趋势相同,且均在瓦斯体积分数为9.5%时达到最大;在90°弯管中的相同位置处,不同体积分数的瓦斯产生的冲击波峰值超压上升速率呈锯齿形状;瓦斯体积分数为5.8%~11.0%时,传播管内火焰大小随传播距离呈锯齿形变化;瓦斯体积分数为5.8%和6.5%时,火焰在90°弯管前已熄灭;瓦斯体积分数为5.8%~11%时,冲击波峰值超压和火焰大小经90°弯管道后均有较明显的衰减。
In order to explore propagation characteristics of gas with different volume fractions in explosion chambers and venting characteristics of 90°elbows,a gas venting experiment was carried out.Numerical simulation and experimental research were used to analyze propagation process of explosive blast in system,and variation characteristics of blast and flame size of six groups of gas at different volume fraction were explored.The results show that propagation of explosion shock wave in pipeline is in the form of multiple overpressure,and its peak overpressure gradually decreases.Additionally,peak overpressure and its rising rate in explosion cavity have the same change trend,and both reach maximum when gas volume fraction is 9.5%.At the same position in 90°elbows,peak overpressure rising rate generated by different volume fractions of gas is in a sawtooth shape.When it is 5.8%-11.0%,flame size varies in a sawtooth shape along with propagation distance.When at 5.8%and 6.5%,flame is extinguished before 90°.When between 5.8%and 11%,peak overpressure and flame size are significantly attenuated after pipe is bent at 90°.
作者
黄强
穆朝民
王亚军
周辉
李重情
HUANG Qiang;MU Chaomin;WANG Yajun;ZHOU Hui;LI Zhongqing(School of Energy and Safety,Anhui University of Science and Technology,Huainan Anhui 232001,China;Key Lab of Coal Safety and Efficiently Mining Constructed by Anhui Province and Ministry of Education,Anhui University of Science and Technology,Huainan Anhui 232001,China;School of Safety Engineering,Heilongjiang University of Science and Technology,Harbin Heilongjiang 150022,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2020年第11期101-107,共7页
China Safety Science Journal
基金
安徽省高校自然科学研究项目(KJ2017A092)
2019年研究生创新基金资助(2019CX2009)。
