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Graphite Ablation and Thermal Response Simulation Under Arc-Jet Flow Conditions

by Nasa Technical Reports Server (Ntrs) , Et Al , Y. K. Chen
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Current price ₹1,336.00
Original price ₹1,446.00
Original price ₹1,446.00
Original price ₹1,446.00
(-8%)
₹1,336.00
Current price ₹1,336.00

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Book cover type: Paperback
  • ISBN13: 9781289165598
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Publication Date:
  • Pages: 22
  • Original Price: USD 14.75
  • Language: English
  • Edition: N/A
  • Item Weight: 59 grams
  • BISAC Subject(s): General

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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