论文部分内容阅读
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。
In this paper, under low pressure and weak buoyancy conditions, the effects of pressure and oxygen volume fraction on the characteristics of soot pre-combustion and the temperature rise characteristics of wire insulation under overload current were studied. The results show that during the typical weak buoyancy (10 ~ (-2) g), the precipitation process of soot consists of the intact insulation layer and the failure phase of the insulation layer. With the increase of the oxygen volume fraction, the total reaction time decreases nearly linearly , While the peak temperature is accelerating. Under the low pressure environment (less than 10 kPa), the buoyancy is less than 10 -2 g. The pressure is the main factor that affects the soot deposition process of the insulating layer. The lower the pressure is, the less the heat escapes. The higher the insulating layer temperature, Rupture faster, but the amount of flue gas precipitation gradually reduced.