摘要
为了保证大型储罐池火热辐射研究的准确性,首先用1.0 m油盘和11.5 m液池进行柴油全表面池火试验,得到燃烧速率和热辐射分布规律。利用试验得到的燃烧速率和热辐射数据优选FDS湍流亚格子模型和辐射角数,得出采用Constantcoefficient Smagorinsky模型和500辐射角数时,模拟与试验吻合最好,FDS模拟热辐射值略小于试验值。研究储罐尺寸和风速对周边热辐射和安全距离的影响,结果表明:不同尺寸储罐,罐顶平面热辐射以100 kW/m^(2)为分界点,热辐射衰减速率发生改变;随着储罐尺寸增加,绝对安全距离趋于稳定值,与储罐直径比值逐渐减小。不同风速时,地面附近以12 m/s为临界风速,大于12 m/s时,随风速增加,下风向热辐射不再变化,最大值为8 kW/m^(2);罐顶平面,随风速增加,上风向安全距离不变;下风向以9 m/s为临界风速,大于9 m/s时,随风速增加,安全距离基本不变。
In order to ensure the accuracy of the research on the thermal radiation of large storage tank pool fire,the full surface pool fire experiment of diesel oil was carried out with 1.0 m oil pan and 11.5 m liquid pool,and the combustion rate and thermal radiation distribution law were obtained.Using the combustion rate and thermal radiation data obtained from the experiment,the FDS turbulent subgrid model and the number of radiation angles are optimized.It is concluded that when using the constant coefficient Smagorinsky model and 500 radiation angles,the simulation is in good agreement with the experiment,and the FDS simulated thermal radiation value is slightly smaller than the experimental value.The influence of tank size and wind speed on the surrounding thermal radiation and safety distance is studied.The results show that:for tanks with different sizes,the thermal radiation attenuation rate of the tank top plane changes with 100 kW/m^(2)as the dividing point;with the increase of tank size,the absolute safe distance tends to a stable value,and the ratio to tank diameter gradually decreases.At different wind speeds,12 m/s is the critical wind speed near the ground.When it is greater than 12 m/s,the downwind heat radiation will not change with the increase of wind speed,and the maximum value is 8 kW/m^(2);Tank top plane,with the increase of wind speed,the windward safety distance remains unchanged;The critical wind speed in the downwind direction is 9 m/s.When it is greater than 9 m/s,the safety distance is basically unchanged with the increase of wind speed.
作者
张日鹏
Zhang Ripeng(SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Shandong Qingdao 266101,China;State Key Laboratory of Safety and Control for Chemicals,Shandong Qingdao 266101,China)
出处
《消防科学与技术》
CAS
北大核心
2023年第5期603-608,共6页
Fire Science and Technology
基金
应急管理部消防救援局科技项目“低沸点易燃液体储罐火灾高效处置技术及装备”(2021XFCX17)。
关键词
储罐
池火
热辐射
模拟参数
安全距离
storage tank
pool fire
thermal radiation
simulation parameters
safe distance
