Bulk graphite nozzle recession—an analysis based on the carbon-steam reaction

✍ Scribed by L.E. Jones; P.A. Thrower; P.L. Walker Jr.

• Book ID: 102995169
• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 762 KB
• Volume: 24
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(86)90208-3

✦ Synopsis

Bulk graphite gasification rates (Zone I) have been measured between 1123-1323 K at H20/Hz ratios which encompass those found in the exhaust gases resulting from the firing of a typical aluminized solid pro~llant. These Zone I rates are extrapolated on an Arrhenius plot to a tem~rature (~3200 K) which is thought to exist at the surface of a graphite nozzle through which propellant combustion gases pass. The extrapolated rate is higher than that predicted for Zone HI kinetics or found ex~rimentally by other investigators. It is concluded that graphite recession under rocket motor conditions is in the intermediate region between Zones II and Iii. That is, gasification occurs not only at the exterior graphite surface but also in pores close to the exterior surface.