Effect of burning drops of electrical wires at different heights on the ignition and combustion of typical insulation materials
Foam is widely used because of its good properties,but it is flammable and poses a major safety hazard.In this work,the effects of liquid droplets produced by electrical wires at different heights(10,20,30,40,and 50 cm)on the ignition of three types of foam insulation materials(EPS,RPUF,RPUF+EG 10)were investigated by means of experimental methods,including droplet fall,flame height,flame temperature,and heat changes.The results show that the droplet process of droplets at different heights exhibits different drip phenomena,there is a"flame up"and"flame out"phenomenon.The penetration or combustion behavior of the three foams are positively correlated with the number and height of droplets dropped,EPS foam will be penetrated by high temperature droplets,while RPUF and RPUF+EG10 foam will be ignited by high temperature droplets,and the burning intensity of RPUF foam is much greater than that of RPUF+EG10 foam.The flame height of the wire insulation was inversely affected by the flame height of the RPUF foam surface,with the wire insulation extinguishing at heights of 10,40,and 50 cm.Also,at the end of the RPUF foam combustion,the droplet flame remained adhered to the carbon layer,producing two temperature peaks during the combustion of the RPUF foam.On the other hand,the RPUF+EG foam formed a small pool fire with temperature stabilisation.In the combustion process,RPUF foam has a heat received increasing zone and a heat stabilisation zone,and the heat emitted from the combustion of the RPUF+EG 10 foam will keep increasing with the formation of small pool fires on the foam.
foam insulationelectrical wiredropsflame heightflame temperature
万方数据
维普
