TWO DIMENSIONAL TRANSIENT HEATING AND SURFACE THERMOCHEMISTRY COMPUTER PROGRAM, VOLUME I.
Interim technical rept. no. 2, 1 Jan-15 Jun 68,
ATLANTIC RESEARCH CORP ALEXANDRIA VA
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The report describes and gives users 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 acount 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 Users 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. Author
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