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4th Thermal and Fluids Engineering Conference

ISSN: 2379-1748

PYROLYSIS UNDER EXTREME HEAT FLUX CHARACTERIZED BY MASS LOSS AND THREE-DIMENSIONAL SCANS

Jeffrey D. Engerer
Sandia National Laboratories, Albuquerque, NM, 87008-1135

Alexander L. Brown
Sandia National Laboratories, PO Box 5800, Albuquerque, NM, 87185-1136, USA

DOI: 10.1615/TFEC2019.cbf.028030
pages 145-160


KEY WORDS: Three-Dimensional Scanner, Surface Topology, Irradiation, Pyrolysis, Ablation, Thermal Radiation, Extreme Heat Flux

Abstract

A variety of energy sources produce intense radiative flux (>>100kW/m2) well beyond those typical of fire environments. Such energy sources include directed energy, nuclear weapons, and propellant fires. Studies of material response to irradiation typically focus on much lower heat flux; characterization of materials at extreme flux is limited. Various common cellulosic and synthetic-polymer materials were exposed to intense irradiation (up to 3MW/m2) using the Solar Furnace at Sandia National Laboratories. When irradiated, these materials typically pyrolyzed and ignited after a short time (<1 s). The mass loss for each sample was recorded; the topology of the pyrolysis crater was reconstructed using a commercial three-dimensional scanner. The scans spatially resolved the volumetric displacement, mapping this response to the radially varying flux and fluence. These experimental data better characterize material properties and responses, such as the pyrolysis efflux rate, aiding the development of pyrolysis and ignition models at extreme heat flux.

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