Numerical Analysis Of Composition Effects On The Ignition Delay Of
Polymeric Composites
Author(s)
Y. Zhou, A. Stevanovic, S. Mehta, A.C. Femandez-Pello
Abstract
Numerical analysis of composition effects on the
ignition delay of polymeric composites
Y. Zhou, A. Stevanovic, S. Mehta, A. C. Fernandez-Pello
Department of Mechanical Engineering
University of California at Berkeley, USA
Abstract
A numerical approach based on the enthalpy method is applied to predict
endothermic pyrolysis and piloted ignition delay of thermoplastics and
polymeric composites exposed to an external radiant heat flux. The model
considers the coupled thermo-chemical processes that take place in the
condensed phase, and therefore describes the piloted ignition of solid
combustible materials only under conditions of fast chemical kinetics in gas
phase. The condensed phase processes considered in the model include
oxidative and thermal pyrolysis, phase change, heat and mass transfer in a
multi-phase and multi-composition medium, and in-depth radiation
absorption. Ignition is considered to occur when a critical pyrolysate mass
flow is reached at the composite surfa
Keywords
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