Two Dimensional Transient Heating and Surface Thermochemistry Computer Program. Volume 1
Abstract
The report describes and gives user's instructions for a computer program (ASTHMA) for predicting the in-depth temperature history and the surface recession (ablation) history of a two-dimensional, axi-symmetric, non-charring material. The in-depth solution procedure is of the conventional explicit finite-difference type. It will account for anisotropic heat conduction in the main material and allows several back-up materials. The heated surface boundary condition can have any one of three forms at each surface location at each instant: (1) Very general film-coefficient-based simultaneous heat and mass transfer type, including any number of equilibrium reactions for an environment and any ablating material, and four specific kinetically controlled reactions for carbon surfaces. (2) Simplified radiation energy balance type, no ablation ('cooldown' option). (3) Specified temperature and surface recession rate. The program was designed specifically for rocket nozzle use but has sufficient generality that it can be employed for many axi-symmetric shapes. A User's Manual Brief Description is also presented for a computer program (ARCACE) for calculating surface thermochemical response of materials, including kinetically controlled surface reactions. This program provides for surface thermochemical boundary condition information input to the ASTHMA program.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 05, 1968
- Accession Number
- AD0836285
Entities
People
- Carl Moyer
Organizations
- ARCO