航空学报 > 2024, Vol. 45 Issue (6): 428848-428848   doi: 10.7527/S1000-6893.2023.28848

酚醛树脂气凝胶复合材料热物性参数预测方法

张春云1,2, 陈雄斌3, 刘健3, 崔苗1,2()   

  1. 1.大连理工大学 工业装备结构分析优化与CAE软件全国重点实验室,大连 116024
    2.大连理工大学 辽宁省空天飞行器前沿技术重点实验室,大连 116024
    3.北京空天技术研究所,北京 100074
  • 收稿日期:2023-04-10 修回日期:2023-06-12 接受日期:2023-06-28 出版日期:2024-03-25 发布日期:2023-07-07
  • 通讯作者: 崔苗 E-mail:miaocui@dlut.edu.cn
  • 基金资助:
    国家自然科学基金(12172078);中央高校基本科研业务费(DUT21LK04)

Prediction of thermo⁃physical properties of inorganic⁃organic hybrid phenolic aerogel composites

Chunyun ZHANG1,2, Xiongbin CHEN3, Jian LIU3, Miao CUI1,2()   

  1. 1.State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China
    2.Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province,Dalian University of Technology,Dalian 116024,China
    3.Beijing Aerospace Technology Institute,Beijing 100074,China
  • Received:2023-04-10 Revised:2023-06-12 Accepted:2023-06-28 Online:2024-03-25 Published:2023-07-07
  • Contact: Miao CUI E-mail:miaocui@dlut.edu.cn
  • Supported by:
    National Natural Science Foundation of China(12172078);Fundamental Research Funds for the Central Universities(DUT21LK04)

摘要:

针对酚醛树脂气凝胶复合材料(IPC)碳化过程热物性参数动态变化和难以准确测量的问题,基于试验测量信息,通过求解瞬态非线性热传导反问题,提出了一种预测IPC碳化过程热物性参数的新方法。采用改进的梯度算法对瞬态非线性热传导反问题进行求解,预测随温度变化的热物性参数。引入复变量求导法准确计算灵敏度矩阵,提高预测精度。结果表明,与传统的梯度算法相比,该算法在求解瞬态非线性热传导反问题时具有很好的稳定性、精度和效率,计算时间由75 s降至35 s。测点温度计算值和试验测量值的平均相对误差为3.279%,采用该算法预测IPC碳化过程等效导热系数精度高。该工作为获取热防护材料的高温热物性参数提供了一种有效方法,为碳化型热防护材料的工程设计提供了关键参数。

关键词: 热防护, 酚醛树脂气凝胶复合材料, 等效导热系数, 参数预测, 梯度算法

Abstract:

The thermo-physical properties of Inorganic-organic Hybrid Phenolic Aerogel Composites (IPC) are difficult to be accurately measured, due to the dynamic changes during carbonization. A new method to predict the thermo- physical properties of IPC during carbonization is proposed based on the measured information, by solving transient nonlinear inverse heat conduction problems. The modified gradient-based algorithm is applied to solving the transient nonlinear inverse heat conduction problem, to predict the temperature-dependent thermo-physical properties. To improve the accuracy, the complex variable-differentiation method is introduced to calculate the sensitivity coefficient matrix. The results show that the proposed algorithm has better stability, accuracy and efficiency than the conventional gradient algorithm in solving transient nonlinear inverse heat conduction problems, and the calculation time is reduced from 75 s to 35 s. The relative error between the calculated temperatures and measurements is 3.279%, and the present algorithm has high accuracy in predicting the effective thermal conductivity of IPC during carbonization. This work provides an effective method for the determination of the high temperature thermo-physical properties of thermal protection materials, and provides the key parameters for the engineering design of charring thermal protection materials.

Key words: thermal protection, inorganic-organic hybrid phenolic aerogel composites, effective thermal conductivity, parameter prediction, gradient-based algorithm

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