Study on Combustion Behavior and Flame Characteristics of Multi-layer Cables
In order to study the fire characteristics of trays cables in narrow underground spaces,this work carried out cable combustion experiments with different trays spacing and ignition locations,and analyzed the effects of three trays spacing(0.2 m,0.3 m and0.4 m)and three ignition locations(lower,middle and upper)on cable combustion characteristics.Experiments show that the flame front position with time shows a trend of increasing first and then unchanged,while its growth rate can be found with the increase in trays spacing and decrease at the same ignition position and different trays spacing conditions;The av-erage cable flame spread rate gradually reduced with the increasing spacing;The upper layer to be slightly faster than the lower layer of cable fire spread rate at the same trays spacing and different ignition position conditions;When the middle layer of the ca-ble is ignited,the cable mass loss is the first to enter the rapid growth phase,followed by the upper and lower layers respectively;When the lower layer of the cable is ignited,its corresponding heat release rate peak is the largest,up to 928 kW.While the middle and upper layers of the corresponding heat release rate decreases in turn after ignition,and they are797 kWand713 kW,respectively.
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