Experimental Study on Burning and Swelling Behaviors of Flame Retardant Cables in a Cylindrical Heating Chamber
The object of this work is investigate the burning and swelling characteristics of the typical flame retardant single cables commercially available.A new experimental setup using a cylindrical heating chamber was designed to study their detailed burning and swelling behaviors.One series of experiments were conducted for 1 meter and 0.1 meter long cable samples, respectively.For the 1 meter long cable sample, the heating, ignition and burning behaviors were studied with heat fluxes of 0.75, 2.4, 5, 17, 34 and 55 kW/m2.The results shows that there are obvious critical heat flux for the ignition of the flame retardant cables.The data here suggested that the value is about 5 kW/m2, since the flame spread from the bottom of cable to the top very slowly after a small pool flame was ignited under this condition.For the cases of external heat fluxes of 34 and 55 kW/m2, the whole cable sample would bum strongly instantly only after 10 minutes heating.However, there are two periods of upward flame spread when the external heat flus is 17 kW/m2.For the detail swelling behaviors experiments on 0.1 meter cable samples with heat flux of 55 kW/m2, the results suggest that the outer flame retardant sheath would expand strongly while being heated.The whole deformation period of cable samples in this heating condition can be divided into four stages.Additionally, the comparison between the mass loss rates and the cable widths illustrate that they have almost the same changing trend as the strong heating going on.Meanwhile, there are maximum mass loss rates when the cable sheath started to break strongly.Finally, it is suggested that the outer cable sheath not only physically protect the inner layers, but also prevent the releasing out of the inner vapor generated from the combustible insulation layers.Therefore, it is important to replace the cables with small breakages in engineering applications.
electrical cable swelling ignition flame spread cylindrical heating chamber
GONG Tai XIE Qiyuan LEI Qingqing
State Key Lab of Fire Science, University of Science and Technology of China, Hefei 230027, Anhui, China
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
276-283
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）