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首页> 外文期刊>Aerospace science and technology >Competitive kinetic model for the pyrolysis of the Phenolic Impregnated Carbon Ablator
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Competitive kinetic model for the pyrolysis of the Phenolic Impregnated Carbon Ablator

机译：酚醛浸渍碳烧蚀剂热解的竞争动力学模型

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摘要

Carbon/phenolic ablators are successfully used as thermal protection material for spacecraft. Nevertheless, their complex thermal degradation is not yet fully understood, and current pyrolysis models do not reproduce important features of available experimental results. Accurate and robust thermal degradation models are required to optimize design margin policy. We investigate whether the competitive kinetic schemes commonly used to model biomass pyrolysis are appropriate to describe the thermal degradation of carbon/phenolic composites. In this paper, we apply competitive pyrolysis mechanisms for the thermal degradation of the carbon/phenolic ablator PICA. Model parameters are then calibrated using a robust two-step methodology: first deterministic optimization is used to obtain the best estimation of the calibration parameters based on the experimental data, then a stochastic Bayesian inference is performed to explore plausible set of solutions taking into account the experimental uncertainties. The proposed calibrated model provides an accurate description of the pyrolysis process at different heating rates. The model shows great flexibility and robustness at a similar computational cost as the traditional devolatilization models. This opens the possibility for more complex mechanisms when more experimental data becomes available. (C) 2020 Elsevier Masson SAS. All rights reserved.
机译：碳/酚烧蚀器已成功用作航天器的热防护材料。然而，它们的复杂热降解尚未完全了解，并且当前的热解模型并未重现可用实验结果的重要特征。需要精确而强大的热降解模型来优化设计裕量策略。我们调查通常用于模拟生物质热解的竞争动力学方案是否适合描述碳/酚醛复合材料的热降解。在本文中，我们将竞争性热解机理应用于碳/酚烧蚀剂PICA的热降解。然后使用鲁棒的两步法对模型参数进行校准：首先使用确定性优化，根据实验数据对校准参数进行最佳估计，然后进行随机贝叶斯推理，以考虑可能的解集。实验不确定性。所提出的校准模型提供了在不同加热速率下热解过程的准确描述。该模型以与传统的脱挥发分模型相似的计算成本显示了极大的灵活性和鲁棒性。当更多的实验数据可用时，这为更复杂的机制提供了可能性。 （C）2020年Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2020年第5期|105784.1-105784.12|共12页
  • 作者

  • 作者单位

    von Karman Inst Fluid Dynam B-1640 Rhode St Genese Belgium|Vrije Univ Brussel Fac Engn Thermo & Fluid Dynam FLOW B-1050 Brussels Belgium;

    von Karman Inst Fluid Dynam B-1640 Rhode St Genese Belgium|Univ Liege Aerosp & Mech Engn Allee Decouverte 9 B-4000 Liege Belgium;

    Univ Illinois Urbana IL 61801 USA;

    von Karman Inst Fluid Dynam B-1640 Rhode St Genese Belgium;

    Univ Liege Aerosp & Mech Engn Allee Decouverte 9 B-4000 Liege Belgium;

    NASA Ames Res Ctr Moffett Field CA 94035 USA;

    Vrije Univ Brussel Fac Engn Thermo & Fluid Dynam FLOW B-1050 Brussels Belgium;

  • 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
  • 中图分类
  • 关键词

    Carbon/phenolic composite; Kinetics; Pyrolysis; Optimization;

    机译：碳/酚醛复合材料;动力学;热解;优化;

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