Coking characteristics of low density ablators

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Coking phenomenon in low density carbon phenolic ablative material exposed to aerodynamic heating is examined experimentally. The in-depth density and gas permeability of the material heated in an arcjet wind tunnel is measured. Toward the surface within the char layer, the density increases and the gas permeability decreases respectively. The reason for such a trend is likely due to coking effect: coking in the char layer is known as a phenomenon that when the pyrolysis gas passes through the porous char layer to the surface, solid carbon is deposited within the char layer under the chemical decomposition reaction of hydrocarbon species such as CH4.It is find in this study that coking could occur in a low density carbon-phenolic ablator.