CAJ | 학술논문

碳纤维材料已成为核能、航天等领域不可或缺的重要功能材料，在高温气冷堆及其相关实验中需要使用大量碳纤维保温材料。但由于目前测试方法的限制，相关材料物性参数测量数据严重不足，尤其是缺乏高温1000℃以上的热物性参数，致其使用受到限制。为此，清华大学核能与新能源技术研究院研制了模拟高温气冷堆温度、环境氛围的材料测试装置，可提供1600℃以下的材料性能测试。根据该装置一次典型实验过程的测量数据，详细介绍了采用非线性导热反问题方法确定材料温度相关导热系数的完整过程和具体算法。提出了一种依据稳态、非稳态热传导原理求解反问题的简明算法，该方法既可单独使用，也可为其他反问题算法提供良好的迭代初值。实验确定了高温气冷堆用碳毡保温材料在1600℃以下的导热系数，将为高温气冷堆相关实验和其他特高温条件下的应用提供重要参考。
탄섬유재료이성위핵능、항천등영역불가혹결적중요공능재료，재고온기랭퇴급기상관실험중수요사용대량탄섬유보온재료。단유우목전측시방법적한제，상관재료물성삼수측량수거엄중불족，우기시결핍고온1000℃이상적열물성삼수，치기사용수도한제。위차，청화대학핵능여신능원기술연구원연제료모의고온기랭퇴온도、배경분위적재료측시장치，가제공1600℃이하적재료성능측시。근거해장치일차전형실험과정적측량수거，상세개소료채용비선성도열반문제방법학정재료온도상관도열계수적완정과정화구체산법。제출료일충의거은태、비은태열전도원리구해반문제적간명산법，해방법기가단독사용，야가위기타반문제산법제공량호적질대초치。실험학정료고온기랭퇴용탄전보온재료재1600℃이하적도열계수，장위고온기랭퇴상관실험화기타특고온조건하적응용제공중요삼고。
Carbon fiber material has become an indispensable function material in nuclear and aerospace fields .Researches and designs of the high temperature gas‐cooled reactor (HTGR) require a large amount of this kind of heat insulation material .Due to limita‐tions of current measuring techniques , thermo‐physical property data of carbon fiber material are gravely insufficient , especially for the data of high temperatures above 1 000 ℃ ,which limits the application of this material .For this purpose ,a material performance test apparatus simulating the high temperature and ambient atmosphere in the HTGR core was built by Institute of Nuclear and New Energy Technology (INET) of Tsinghua University ,which can conduct material performance tests at temperatures up to 1 600 ℃ .With the measuring data from a typical experimental process in this apparatus ,a complete procedure and detailed algorithm of estimating the temperature‐dependent thermal conductivity of carbon insulating felt by means of inverse nonlinear heat conduction problem method were introduced . A concise algorithm of solving inverse problem based on the law of steady and transient heat conduction w as proposed , which could either work alone or provide ideal initial values for other inverse problem methods .Finally ,values of thermal conductivity of carbon felt used in the HTGR below 1 600 ℃ were determined in the experiment ,which could be used as reference in HGTR related experiments and other ultra‐high temperature applications .