Ablative Plastics Characterization. Part III. Convective-Radiative Reentry Heating.
Abstract
Methods were sought to improve ablative performance under combined convective-radiative reentry heating. Twenty percent (by weight) of a particulate filler was used with silica/phenolic, carbon/phenolic and low-density charring ablative materials for incident-radiation scattering (aluminum, and fluorides of magnesium, calcium, and barium) or absorption (fluorides of potassium and sodium) within the boundary layer, or for surface reflection (zirconia). Simplified theoretical analyses aided in the choosing of fillers in the designing of experiments, and in the interpretation of results. Analysis topics included absorption effects on heat of ablation, applicable flight regimes for radiation blocking, and boundary-layer scattering by a precipitated metal oxide. The program established the performance of filled reference materials and relative filler effectiveness for selected laboratory environments. Supporting analyses further defined the potential of material-filler combinations for improving ablative performance under combined convective-radiative reentry heating. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1968
- Accession Number
- AD0842574
Entities
People
- B. J. Mitchel
- F. L. Tempesta