Accession Number:

AD0836285

Title:

TWO DIMENSIONAL TRANSIENT HEATING AND SURFACE THERMOCHEMISTRY COMPUTER PROGRAM, VOLUME I.

Descriptive Note:

Interim technical rept. no. 2, 1 Jan-15 Jun 68,

Corporate Author:

ATLANTIC RESEARCH CORP ALEXANDRIA VA

Personal Author(s):

Report Date:

1968-07-05

Pagination or Media Count:

185.0

Abstract:

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

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware
  • Thermodynamics
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE