首页|Upward flame spread of flame-retardant cables with different ATH contents: Ignition, swelling, melting and flowing
Upward flame spread of flame-retardant cables with different ATH contents: Ignition, swelling, melting and flowing
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NETL
NSTL
Elsevier
To investigate the specific ignition and upward burning behaviors of flame retardant (FR) cables, series of experiments were conducted for FR-cables with mass fractions of aluminum hydroxide (ATH) of 58 %, 61 %, 64 %, 67 %, 70 % and 73 %, respectively. The results show that all studied FR-cables can be ignited by a coil heater delivering a heat flux of approximately 29 kW/m2, with the longest ignition delays for the samples containing the highest ATH content. Compared to FR-cables with 67 % and 70 % ATH contents, the melting and downward flowing are more pronounced for the samples of 58 %, 61 % and 64 % ATH, resulting in stronger burning with longer flame length and width. The upward flame spread velocities for all FR-cable samples are in the range of 1.2-1.6 mm/s and slightly smaller for cables with higher ATH contents. Specifically, the strong downward flowing of the melting liquid in the burning zone obviously slows down their upward flame spread. Dimensionless pyrolysis depth and flowing length are introduced to quantitatively describe the unique burning behaviors of FR-cables and a corresponding new flame spread model is developed based on energy conservation. The good agreement between the experimental and calculated data suggests its effectiveness and reasonability.
NETL
NSTL
Elsevier
