摘要
为研究柱形压力容器泄爆规律,采用经典流体力学软件FLUENT对典型的柱形压力容器泄爆过程进行数值模拟,分析从泄爆口开启到泄压结束时间段压力发展、火焰传播、气体流动及可燃气体浓度变化特性。结果表明:不同泄爆压力下容器内压力发展变化呈现不同特点,在较小泄爆压力情况下会出现压力再度上升的双峰现象。泄爆过程中产生的湍流沿泄爆口附近容器壁拉长火焰面,并加快燃烧速率。同时就容器内不同点火位置对爆炸强度影响进行研究,得出在泄爆压力为0.04 MPa时,底面点火对本柱形压力容器产生的最大升压速率约为中心点火最大升压速率的1.4倍。
The mathematical model of pressure field in the vented explosion process in closed cylindrical vessel was built based on FLUENT software.The characteristics of pressure development,flame propagation,gas flow and flammable gas concentration change in the process from the opening of bursting disc to the completely discharging of pressure were studied.The results show that the development and change of vessel pressure exhibit different characteristics in different explosion venting pressure,and vessel pressure will take on a double-peak phenomenon with a second-rise of pressure under less venting pressure.The turbulent flow produced in the process of venting explosion will elongate the flame along the vessel surface near vent and enhance the burning rate.At last,the influences of different ignition position on explosion intensity were also studied.Results show that,for the venting explosion with 0.04 MPa,the ignition explosion intensity on the bottom of cylindrical is 1.4 times of the intensity in the center.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2011年第11期29-34,共6页
China Safety Science Journal
关键词
柱形容器
开口泄爆
点火位置
升压速率
数值模拟
cylindrical vessel
explosion venting
ignition position
boostering rate
numeral simulation
