摘要
基于锥形量热仪的实验条件,建立了一维电缆点燃模型。试验采用聚氯乙烯(PVC)护套单芯电力电缆,热辐射强度分别选择30、40、50、60 kW/m2。结果表明:①采用积分模型得到的计算值点燃时间与试验值点燃时间比较接近,且热辐射强度越强,误差越小。②热辐射强度为25 kW/m2的积分模型计算结果:开始阶段,表面温度会迅速增高;时间越长,表面温度上升越缓慢。③电缆各层间的热量传递呈非线性关系。结论:①积分模型可较好地预测电缆的点燃时间;②电缆线芯影响着表面的温升。
Based on the experimental condition of the cone calorimeter, one-dimensional eable ignition model has been built. The test adopts core cable with PVC shield, and the heat radiation strength is 30, 40, 50, 60 kW/m2 respectively. Results show that： ①The calculative ignition time of integral model is dose to the experimental ignition time. And the stronger the heat radiation is, the smaller the error is. ② When heat radiation strength is 25 kW/m^2, the calculation results of the integral model show that： At start, the surface temperature increases rapidly. The longer the time, the slower the surface temperature rise. ③The heat transmission of the cable between layers appears to be a nonlinear relationship. Conclusion： ①The integral model may forecast the ignition time of cable better. ②Core of the cable will affect the surface temperature rise.
出处
《消防科学与技术》
CAS
北大核心
2009年第8期563-566,共4页
Fire Science and Technology
基金
国家"十一五"科技支撑计划项目(2006BAK06B02-3)
国家自然科学基金资助项目(50536030)
研究生创新基金资助项目(KD2006073)
关键词
电缆
引燃
火灾模型
cable
ignition
fire model
