摘要
为研究障碍物控制天然气喷射火对周围设施危害的有效性,基于流体力学基本原理与湍流模型,采用FDS模拟软件,分别研究高度为10 m的障碍物宽度和障碍物与泄漏孔间距对喷射火的影响。研究得出:障碍物对喷射火阻挡效果明显,减缓了火焰在速度方向的传播;障碍物越宽,控制火焰向前传播的效果越好,障碍物后方受火焰高温和热辐射危害越小,但随着宽度的增加,后方温度和热辐射下降率减小,障碍物宽3 m时,对火焰控制效果最好;随着障碍物与泄漏孔间距增加,障碍物后方热辐射先增加后减小,间距为5 m时,障碍物对火焰的控制效果最好,此时喷射火下游受保护的区域最宽。研究结果可为储气罐发生泄漏火灾事故处置及应急设施设计提供参考。
To study the effectiveness of obstacle on preventing surrounding facilities from hazard by jet fire of natural gas,based on the principles of fluid mechanics and turbulence model,the influence by different widths of obstacle with 10 m height and different distances between obstacle and leakage hole on jet fire were investigated with FDS software respectively.It showed that the blocking effect of obstacle on jet fire was obvious,and it mitigated flame to propagate in the velocity direction. The wider the obstacle was,the better effect of preventing flame from propagating forward was,and the less hazard from high temperature and thermal radiation behind the obstacle was. However,with the increase of width,the descending rates of rear temperature and thermal radiation decreased,and the optimum effect of controlling flame was obtained at 3 m. With the increase of distance between obstacle and leakage hole,the thermal radiation behind the obstacle increased firstly and then decreased,and the optimum effect of preventing flame was obtained at 5 m,at this moment,the protected area in downstream of jet fire was the widest. It can provide reference for dealing with the fire accident of natural gas tank and designing emergency facilities.
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2016年第1期111-116,共6页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(51474151)
北京市哲学社会科学CBD发展研究基地创新项目(TDJD201560)
关键词
喷射火
障碍物
储罐火灾
热辐射
数值模拟
jet fire
obstacle
tank fire
thermal radiation
numerical simulation
