Study on the "Steadiness" of Flame Spreading of Electric Wires : Verification of Dominant Factor for Melting and Gasification Processes during Cable Fires

本文对火焰在电线上扩散的稳定性进行了实验和数值（理论）研究。通过对电线在火焰蔓延过程中的精确可视化和温度测量，了解了导致系统失稳的机理和达到系统稳定的条件。为了验证这一考虑，Pe-。提出了相关性，并进行了验证。通过微焰研究，验证了b数理论描述线材燃烧特性的适用性。建立了基于VOF法和焓孔法的直接数值模拟方法，成功地实现了对熔融聚合物受热生长过程的精确预测。

Steadiness of flame spread over electric wire has been studied experimentally as well as numerically(theoretically). With precise visualization and temperature measurement of wire during the flame spreading event, it is understood what is the mechanism to lead the unsteadiness and what is the condition to reach steadiness of the system. To verify this consideration, Pe-. correlation has been proposed and the verification is fulfilled. Applicability of B-number theory to describe wire combustion character was ensured via microflame study. Direct numerical simulation methodology was developed based on VOF method and enthalpy-porosity method and the precise prediction of growing event of heated molten polymer was successfully accomplished.