摘要
结合气体爆炸传播机理,利用FLACS软件对泄压点火不同端两种方式(泄压口通径为25 mm和泄压口完全开放)下甲烷的爆炸过程进行数值模拟,获得了5种体积分数甲烷的爆炸特性参数,分析得出:两种不同泄压方式下,10%,9.5%,11%体积分数的甲烷爆炸特性变化趋势接近,7%,8%的甲烷较前三者有所延迟;5种甲烷在管道中心处的最大爆炸压力、最大爆炸压力上升速率、最大爆炸压力下降速率、温度峰值都随甲烷体积分数的增大而逐渐上升,在10%时达到最大,继续增加甲烷体积分数则出现下降趋势,最大爆炸压力时间变化趋势与其相反;管道中心处的爆炸产物浓度随着甲烷体积分数的增大而增大,与泄压方式无关;增大管道泄压口面积有利于爆炸压力以及爆炸高温高压气体的释放,使得各体积分数甲烷的最大爆炸压力、最大爆炸压力上升速率、最大爆炸压力下降速率、温度峰值均下降,到达最大爆炸压力的时间均增大。
Based on the gas explosion propagation mechanism, the explosion process of methane is simulated by FLACS under two different ways that the decompression and ignition are in different sides in a vessel（ diameter of de- compression side is 25 mm and decompression side is completely opened）, and the parameters of the methane explo- sion characteristic in 5 kinds of volume fraction are obtained, finding out that： under two different pressure relief mod- els, variations of parameters in methane explosion are very close to each other in the volume fraction of 10%, 9.5% and 11%, and the volume fraction of 7% and 8% are somehow behind the first three. With the increase of the vol- ume fraction of methane the maximum explosion pressure, the rise/drop rate of maximum explosion pressure and the maximum temperature in the center of the vessel are all gradually rising under 5 different concentrations of methane, all reach the maximum at 10% , then decline if continuing increasing the volume fraction of methane and however the time of maximum explosion pressure is completely opposite against the former four parameters. The product volume fraction in the center of the vessel has nothing to do with the way of pressure relief but gradually rises along with the increase of methane concentration. Increasing the area of decompression side can benefit the release of high tempera- ture and high pressure gas, which results in the decrease of the maximum explosion pressure, rise/drop rate of maxi- mum explosion pressure and maximum temperature and the increase of the time of reaching the maximum explosion pressure under different volume fraction of methane.
出处
《工业安全与环保》
北大核心
2017年第11期13-17,29,共6页
Industrial Safety and Environmental Protection
基金
国家自然科学基金(51674193)
陕西省科技攻关项目(2015SF280)
西安科技大学博士启动基金(2013QDJ048)
关键词
甲烷爆炸
FLACS
数值模拟
爆炸压力
methane explosion
FLACS
numerical simulation
explosion pressure
