长直管道预混气体爆燃波系演化过程研究  

Study on evolution process of deflagration wave system of premixed gas in long straight pipeline

作　　者：胡洋[1,2] 陶红 宋民航 吕硕 张海霞 HU Yang;TAO Hong;SONG Minhang;LYU Shuo;ZHANG Haixia(School of Safety Engineering,North China Institute of Science and Technology,Langfang Hebei 065201,China;Key Laboratory of Industrial Safety Accident Analysis,Monitoring and Early Warning,Ministry of Emergency Management,Langfang Hebei 065201,China)

机构地区：[1]华北科技学院安全工程学院,河北廊坊065201 [2]应急管理部工业安全事故分析与监测预警重点实验室,河北廊坊065201

出　　处：《中国安全科学学报》2024年第3期55-62,共8页China Safety Science Journal

基　　金：中央引导地方科技发展资金项目(226Z1708G);中央高校建设世界一流大学(学科)和特色发展引导专项(0502010412)。

摘　　要：为减少工业场所可燃气体生产、运输和储存过程中气体爆炸事故的发生,利用自主搭建的200 mm×200 mm×35 m方形管道和直径为90 mm、长度为10 m的圆形管道,在相同的初始条件下,运用体积分数为9.5%的甲烷/空气预混气体开展爆炸试验,结合压力、火焰传感器对其进行研究。结果表明:2种不同尺度、不同截面的管道中波系演化过程是相同的,点火后火焰由层流向湍流转变,火焰加速导致压缩波相互追赶,最终形成强激波;速度在2种长直管道中的变化趋势相同,都经历了加速—减速—再加速—再减速的过程,方管和圆管中火焰速度最大分别达到69和35.7 m/s,第一道压缩波经壁面反射后压力上升至117%和114%;当反射波与火焰阵面耦合作用时,方管和圆管中火焰速度分别降至73%和93%;体积分数相同的条件下,2种长直管道中第一道压缩波的最大压力值相近,方管中为65.45 kPa,圆管中为67.09 kPa。In order to reduce gas explosion accidents during the production,transportation and storage of combustible gases in industrial sites,square pipes of 200 mm×200 mm×35 m and round pipes of 90 mm diameter and 10 m length were independently constructed.Under the same initial conditions,the explosion test of methane/air premixed gas with volume fraction of 9.5%was carried out,and it was studied with pressure and flame sensors.The results show that the evolution process of the wave system in two kinds of pipes with different scales and cross sections is the same.After ignition,the flame changes from layer to turbulent flow,and the acceleration of flame leads to the compression wave chasing each other,finally forming a strong shock wave.The changing trend of flame speed in the two long straight pipes is the same,and they both experience the process of acceleration-deceleration-re-acceleration-re-deceleration,with the maximum flame speed in the square tube and round tube reaching 69 and 35.7 m/s respectively.After the first compression wave reflects off the wall,the pressure rises to 117%and 114%.When the reflected wave is coupled with the flame front,the flame speed in the large-scale pipeline is reduced to 73%,and that in the small pipeline is reduced to 93%.Under the same volume fraction,the maximum overpressure values of the first compression wave in the two long straight spaces are similar,which are about 65.45 and 67.09 kPa.

关 键 词：长直管道 预混气体 爆燃 波系演化 压力波 

分 类 号：X932[环境科学与工程—安全科学]