弱浮力下导线绝缘层早期燃烧特性研究  

Study on Combustion Characteristics of Overloaded Wire Insulation at the Early Stage of Fire in Weak Buoyancy Environment

作　　者：夏伟[1,2] 汪凯[1,2] 王宝瑞[1] 孔文俊[1] 

机构地区：[1]中国科学院轻型动力重点实验室,中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《工程热物理学报》2016年第4期876-882,共7页Journal of Engineering Thermophysics

基　　金：中国科学院空间科学战略性先导科技专项资助(No.XDA04020408)

摘　　要：本文在低压弱浮力环境下,研究了压力和氧气体积分数对过载电流下导线绝缘层燃烧前期碳烟析出特性及温升特性的影响。结果表明,典型弱浮力(10^(-2)g)下碳烟析出过程由绝缘层完好阶段和绝缘层破坏阶段组成,且随着氧气体积分数的增大,总反应时长呈近乎线性减小,而峰值温度则加速上升。低压环境(低于10 kPa)下,即浮力小于10^(-2)g,压力大小为影响绝缘层碳烟析出过程的主要因素,压力越低,热量不易逸出,绝缘层温度越高,破裂越快,但烟气析出量逐渐减少。It is studied experimentally that effects of pressure and oxygen volume fraction on smoke emission and temperature variation of overloaded wire insulation at the early stage of fire under weakly buoyant environments.Results indicate that the process of smoke emission consisted of two stages in typical weakly buoyant environment（10^（-2）g）,which are insulation unbroken stage and insulation broken stage.With the increase of oxygen volume fraction,total reaction time decreases almost linearly,but the growth of peak temperature accelerates.Under low pressure environment（below 10kPa）,the value of pressure is the main factor to affect the smoke emission process of overloaded wire insulation.With the reduce of ambient pressure,the insulation broke faster and its temperature rise higher,but the amount of smoke emitted lessen accordingly.

关 键 词：弱浮力 导线过载 燃烧早期 碳烟析出特性 

分 类 号：TK16[动力工程及工程热物理—热能工程]