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首页> 外文期刊>Journal of Spacecraft and Rockets >Ablation Predictions for Carbonaceous Materials Using Two Databases for Species Thermodynamics
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Ablation Predictions for Carbonaceous Materials Using Two Databases for Species Thermodynamics

机译：使用两个物种热力学数据库对碳质材料的消融预测

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摘要

During previous work at NASA Ames Research Center, most ablation predictions were obtained using a species thermodynamics database derived primarily from the JANAF thermochemical tables. However, the chemical equilibrium with applications thermodynamics database, also used by NASA, is considered more up to date. In this work, ablation analyses were performed for carbon and carbon phenolic materials using both sets of species thermodynamics. The ablation predictions are comparable at low and moderate heat fluxes, where the dominant mechanism is carbon oxidation. For high heat fluxes where sublimation is important, the predictions differ, with the chemical equilibrium with applications model predicting a lower ablation rate. The disagreement is greater for carbon phenolic than for carbon, and this difference is attributed to hydrocarbon species that may contribute to the ablation rate. Sample calculations for representative Orion and Stardust environments show significant differences only in the sublimation regime. For Stardust, if the calculations include a nominal environmental uncertainty for aeroheating, then the chemical equilibrium with applications model predicts a range of recession that is consistent with measurements for both heatshield cores.
机译：在NASA Ames研究中心的先前工作期间，大多数消融预测是使用主要来自JANAF热化学表的物种热力学数据库获得的。但是，NASA还使用了具有应用程序热力学数据库的化学平衡，它被认为是最新的。在这项工作中，使用两组物种热力学对碳和碳酚类材料进行了烧蚀分析。在低和中等热通量下，烧蚀的预测是可比的，其中主要机理是碳氧化。对于升华很重要的高热通量，预测是不同的，其中应用模型的化学平衡预测了较低的烧蚀速率。酚醛碳的争议大于碳的分歧，并且该差异归因于可能有助于消融速率的烃类。代表性的猎户座和星尘环境的样本计算仅在升华状态下显示出显着差异。对于星尘公司，如果计算结果包括名义上的航空加热环境不确定性，则带有应用程序的化学平衡模型将预测与两个隔热板芯的测量值一致的衰退范围。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2013年第2期|245-255|共11页
  • 作者

    F. S. Milos; Y.-K. Chen;

  • 作者单位

    NASA Ames Research Center, Moffett Field, California 94035-0001;

    NASA Ames Research Center, Moffett Field, California 94035-0001;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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