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Graphite Ablation and Thermal Response Simulation Under ARC-Jet Flow Conditions (en Inglés)
Y. K. Chen
(Autor)
·
Nasa Technical Reports Server (Ntrs)
(Autor)
·
Bibliogov
· Tapa Blanda
Graphite Ablation and Thermal Response Simulation Under ARC-Jet Flow Conditions (en Inglés) - Chen, Y. K. ; Nasa Technical Reports Server (Ntrs) ; Et Al
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Reseña del libro "Graphite Ablation and Thermal Response Simulation Under ARC-Jet Flow Conditions (en Inglés)"
The Two-dimensional Implicit Thermal Response and Ablation program, TITAN, was developed and integrated with a Navier-Stokes solver, GIANTS, for multidimensional ablation and shape change simulation of thermal protection systems in hypersonic flow environments. The governing equations in both codes are demoralized using the same finite-volume approximation with a general body-fitted coordinate system. Time-dependent solutions are achieved by an implicit time marching technique using Gauess-Siedel line relaxation with alternating sweeps. As the first part of a code validation study, this paper compares TITAN-GIANTS predictions with thermal response and recession data obtained from arc-jet tests recently conducted in the Interaction Heating Facility (IHF) at NASA Ames Research Center. The test models are graphite sphere-cones. Graphite was selected as a test material to minimize the uncertainties from material properties. Recession and thermal response data were obtained from two separate arc-jet test series. The first series was at a heat flux where graphite ablation is mainly due to sublimation, and the second series was at a relatively low heat flux where recession is the result of diffusion-controlled oxidation. Ablation and thermal response solutions for both sets of conditions, as calculated by TITAN-GIANTS, are presented and discussed in detail. Predicted shape change and temperature histories generally agree well with the data obtained from the arc-jet tests.
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