为研究甲类仓库中易燃易爆危险化学品的爆炸特性，探究不同点火位置、不同燃 料 － 空气当量比以及堆垛层数对爆炸超压的影响，确定最危险爆炸场景，以戊烷蒸气云爆 炸为例，采用 FLACS 软件进行三维建模和三维动态模拟． 模拟结果表明:点火位置处于戊 烷蒸气云边缘且靠近防火墙时，易产生较大爆炸超压;最大爆炸超压随着戊烷 － 空气当量 比的增大呈现先升高后降低的趋势，且随着堆垛层数的减少而降低;在最危险爆炸场景 (点火位置处于防火墙中部，堆垛层数为 3 层及戊烷 － 空气当量比为 1． 35)下，最大爆炸 超压为 727kPa． 研究结果可为危险化学品甲类仓库的防爆设计提供参考．

Software FLACS was used for 3D modeling and 3D dynamic simulation of effects of different ignition po- sitions，different equivalence ratio of fuel-air and the number of stacking layers on explosion overpressure，in order to study the explosion characteristics of pentane vapor cloud in a class A warehouse． And the worst explosion sce- nario was determined． Taking the explosion of pentane vapor cloud as an example，the simulation results show that when the ignition position is at the edge of the pentane vapor cloud and closed to the firewall，large explosion over- pressure is easily produced; the maximum explosion overpressure increases first and then decreases with increase of the equivalent ratio of pentane-air，and decreases with the decrease of the number of stacking layer; under the worst explosion scenario (ignition position is in the middle of the firewall，number of stacking layer is 3 and equiva- lent ratio of pentane-air is 1. 35)，the maximum explosion overpressure is 727 kPa． The research results can pro- vide reference for explosion-proof design of class A warehouses for hazardous chemicals．