公共汽车内突发纵火后流场特征  

Flow field character of arson fire in a bus

作　　者：杨春英[1] 吴晓伟[2] 苏晓雯[1] 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001 [2]海军装备研究院,北京100073

出　　处：《消防科学与技术》2011年第2期95-99,共5页Fire Science and Technology

基　　金：中央高校基础科研业务费资助项目"船舶空调系统的性能优化研究"(HEUCF100206)

摘　　要：数值模拟公共汽车突然施放0.6 MW热量后的流场特征,给出不同瞬时速度场和温度场的分布规律。实验结果显示现有尺寸有开口的公共汽车,在0.6 MW的热释放量情况下,40 s前后流动特征变化最大,80 s后趋于平缓,140 s后处于内外冷热气流平衡状态,流动特征基本不再变化。对于按t2规律逐渐释放热量的情况,80 s以前流动特征的变化比突然释放热量要小得多。Numerically simulated the flow field character of bus after sudden heat release of 0.6 MW, and the distribution of instantaneous velocity field and temperature field were presented. It was proved that when the heat release rate is 0.6 MW, and in a bus with a certain size opening nowadays, the flow characteristics change fastest around 40 s after ignition, and gently around 80 s, then only a little around 140 s as the internal and external air flow are in the balanced state. When the heat release rate is in aceordance with t2 rule, the change of flow characteristics before 80 s ago is much smaller.

关 键 词：火灾 公共汽车 流场 

分 类 号：X913.4[环境科学与工程—安全科学] TK121[动力工程及工程热物理—工程热物理]