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首页> 外文期刊>Aerospace science and technology >Operational limits for reusable space transportation systems due to physical boundaries of C/SiC materials
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Operational limits for reusable space transportation systems due to physical boundaries of C/SiC materials

机译：由于C / SiC材料的物理边界，可重复使用的空间运输系统的运行限制

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The paper concentrates on the surface interaction phenomena of both SiC-coated and uncoated C/C-SiC material of DLR's well known liquid siliconizing process (LSI) while exposing samples and structures to simulated and real space vehicle reentry conditions. During reentry, physical limits for these types of CMC materials are defined by oxidation resistance, passive-active transition conditions and erosion effects by various reasons like 'mechanical' fluid-surface interaction. Special emphasis is given to the passive-active transition behaviour of SiC and the related 'temperature jump effect' which will be explained by new theoretical research results. In addition a quantitative evaluation of the effect is given based on experimental test sample data. The considerations given in the paper are checked against literature data, observations and experience which have been achieved so far by manifold tests with samples in various facilities, experimental space reentry tests with samples on Russian FOTON capsules and a test with a hot structure during the EXPRESS mission (experiment CETEX). Finally, the understanding of the mechanisms may lead to a revised strategy for optimizing criterions for reentry trajectories of reusable space transportation systems.
机译：本文着重研究了DLR众所周知的液态硅化工艺（LSI）的SiC涂层和未涂层​​C / C-SiC材料的表面相互作用现象，同时将样品和结构暴露于模拟和真实的航天器再入条件下。在折返过程中，这些类型的CMC材料的物理极限由抗氧化性，被动-主动过渡条件和腐蚀效应（由于“机械”流体-表面相互作用）等多种原因所定义。特别强调了SiC的被动-主动过渡行为和相关的“温度跳跃效应”，这将由新的理论研究结果来解释。另外，基于实验样品数据对效果进行了定量评估。本文中给出的考虑与迄今为止的文献数据，观察和经验进行了核对，这些数据是通过对各种设施中的样品进行的多种测试，对俄罗斯FOTON胶囊样品进行的实验性空间折返测试以及​​在EXPRESS期间进行的热结构测试而得出的。任务（实验CETEX）。最后，对这些机制的理解可能会导致修订战略，以优化可重复使用空间运输系统的再入轨道标准。

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