摘要
为研究点火位置和障碍物对泄爆空间丙烷-空气爆炸的影响,基于CFD软件FLACS建立了丙烷泄爆空间数值模型,通过丙烷泄爆试验结果对模型进行了验证,数值模型的计算结果基本可靠。利用已验证的数值模型进一步研究点火位置和障碍物对泄爆空间丙烷-空气混合气体爆炸荷载特性的影响。结果表明:随着点火位置到泄爆口的距离增大,Δp1、Δp2和pmax的峰值随之增大;障碍物的存在导致爆炸产生的湍流加剧,湍流燃烧增大了燃烧速度和燃烧面积,导致Δp1峰值和升压速度增大,并在此过程中产生一个新的超压波峰pobstacle。此外,Δp1和pobstacle峰值的时间间隔随着泄爆阈值的增大而减小,两个超压波峰易合并成一个更大的超压波峰。
In order to study the influence of ignition position and obstacles on propane air explosion in venting space,a numerical model of propane venting space was established based on CFD software FLACS.The model was verified by propane venting test results,and the calculation results of the numerical model were basically reliable.The verified numerical model is used to further study the effects of igniting position and obstacles on overpressure transients during vented explosions of propane–air mixtures.The results show that:as the distance between ignition position and explosion vent increases,the peak values ofΔp1,Δp2 and p_(max)increase accordingly.The existence of obstacles leads to the intensification of turbulence generated by explosion.Turbulent combustion increases the combustion speed and combustion area,resulting in peak value and pressure rise speed ofΔp1 increase.And a new overpressure peak pobstacle is generated in this process.In addition,it was found that the time interval betweenΔp1 and pobstacle peaks decreases with the increase of the venting pressure,and the two overpressure peaks are easy to merge into a larger overpressure peak.
作者
徐睿智
唐柏鉴
陈力
Xu Ruizhi;Tang Baijian;Chen Li(School of Civil Engineering,Suzhou University of Science and Technology,Jiangsu Suzhou 215000,China;School of Civil Engineering,Southeast University,Jiangsu Nanjing 210000,China)
出处
《消防科学与技术》
CAS
北大核心
2023年第8期1038-1045,共8页
Fire Science and Technology
基金
国家自然科学基金(51978166)
华南理工大学亚热带建筑科学国家重点实验室开放基金(2020ZA02)。
关键词
丙烷爆炸
泄爆
点火位置
超压荷载
propane
vented explosion
igniting position
overpressure loads
