Finite-rate and equilibrium study of graphite ablation under arc-jet conditions

被引:14
作者
Zibitsker, Aleksander L. [1 ,5 ]
Mcquaid, Joel A. [2 ,6 ]
Stern, Eric C. [4 ,7 ]
Palmer, Grant E. [3 ,8 ]
Libben, Benjamin J. [4 ,9 ]
Brehm, Christoph [2 ,6 ]
Martin, Alexandre [1 ,5 ]
机构
[1] Univ Kentucky, Lexington, KY 40506 USA
[2] Univ Maryland, College Pk, MD 20742 USA
[3] NASA, AMA Inc, Ames Res Ctr, Moffett Field, CA 94035 USA
[4] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
[5] Mech & Aerosp Engn, 151 Ralph G Anderson Bldg, Lexington, KY USA
[6] Aerosp Engn, 3179 Glenn L Martin Hall Bldg, College Pk, MD USA
[7] Thermal Protect Syst Mat Branch, MS 234-1, Moffett Field, CA USA
[8] Aerothermodynam Branch, MS 230-2, Moffett Field, CA USA
[9] Entry Syst & Vehicle Dev Branch, Moffett Field, CA USA
基金
美国国家科学基金会;
关键词
Arc-jet flow; Graphite ablation; Overset grid solver; Material response; Coupled simulation; THERMAL RESPONSE; RATE CONSTANTS; SIMULATION; CARBON; IMPLEMENTATION; DISSOCIATION; PYROLYSIS; PROGRAM; FLOW;
D O I
10.1016/j.compfluid.2023.106069
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Arc-jet facilities play a primary role in recreating aerothermal conditions experienced by atmospheric entry vehicles and are widely used to test the performance of thermal protection materials. In this work, we utilize a developed coupled framework between an overset flow solver CHAMPS NBS-Cart, and a material solver KATS-MR to study the ablation of graphite under arc-jet conditions. We implement a 12-species gas phase model to accurately represent the air-carbon mixture, including argon species present in the flow. The gas phase is modeled with a two-temperature thermo-chemical non-equilibrium model without considering electronic and ionization effects. The gas-surface interactions are modeled with a newly developed air-carbon ablation model accounting for oxidation, nitridation, and recombination reactions. In addition, the model is augmented with carbon sublimation reactions experienced at high heating conditions. The chemical state at the surface is tightly coupled with the flow solver, resulting in the improved accuracy and effectiveness of the simulation. The coupled approach is applied to study two experimental test cases conducted at the IHF arc-jet facility at NASA Ames. The predicted results are validated against measured recession, surface, and in-depth temperatures and compared to the prediction of the uncoupled, equilibrium-based approach. Finally, the accuracy of the prediction is explored with respect to the environmental properties, such as the diffusion coefficient, and material thermal conductivity.
引用
收藏
页数:20
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