室内火灾机械排烟效果的模型计算与实验研究  

Modeling and Experimental Studies on Mechanical Exhaust Efficiency in Compartment Fire

作　　者：史聪灵[1] 李元洲[1] 霍然[1] 

机构地区：[1]中国科技大学火灾科学国家重点实验室,合肥230026

出　　处：《燃烧科学与技术》2003年第6期546-550,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展规划资助项目(2001CB409604);国家"十五"科技攻关资助项目(2001BA803B).

摘　　要：研究了机械排烟情况下,室内烟气层保持在一定高度时,机械排烟速率和羽流卷吸速率的关系,并采用不同羽流卷吸模型和溢流模型,计算一定排烟速率下、不同火源功率时烟气层的稳定界面高度.在一个具有一定通风口高度的全尺寸普通房间内进行了实验,通过实验结果和计算结果,分析了机械排烟对烟气的控制效果,讨论了机械排烟情况下受限空间内的羽流模型的适用情况,同时对影响模型计算结果的一些因素进行了分析.The correlation to keep the smoke layer interface above a certain height between mechanical exhaust rate and smoke plume mass flux in compartment fires is analyzed.By using different fire plume entrainment equations along with spill plume equation, the steady smoke layer interface heights are calculated at a certain exhaust rate with different fire sizes. A series of fire tests were carried out in a full-scale compartment with an opening.Through the results of experiments and calculation, the efficiency of the mechanical exhaust is discussed.The applicability of plume correlations is compared in the case of compartment fire with mechanical exhaust. Besides, some factors affecting the calculation are analyzed.

关 键 词：机械排烟 羽流模型 烟气溢流 稳定高度 

分 类 号：TK121[动力工程及工程热物理—工程热物理]