Analytical modeling of the transient ablation of a 3D C/C composite
Analytical modeling of the transient ablation of a 3D C/C composite
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DOI：
10.1016/j.ijheatmasstransfer.2017.06.130
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发表时间：
2017-12
影响因子：
5.2
通讯作者：
J. Lachaud;Y. Aspa;G. Vignoles
中科院分区：
文献类型：
--
作者：
J. Lachaud;Y. Aspa;G. Vignoles
实验研究表明，致密C/C复合材料在氧化条件下具有复杂的表面烧蚀行为。它们的有效反应性相对于其组分的本征反应性而言不是一种加和性质。典型的表面粗糙度图案逐渐出现，有效反应性随着时间的推移而增加，直到它达到稳态值。在以前的工作中，3D C/C复合材料的稳态行为已经建模和解释。在这里，工作已经扩展到解决瞬态政权的行为。表面粗糙度的演变和有效的反应性计算随时间的变化。通过与实验数据的比较验证了模型的有效性。这些理论结果提供了第一次在致密的C/C复合材料的表面发生的复杂烧蚀过程的全面理解。
Experimental studies have shown that dense C/C composites feature a complex surface ablation behavior under oxidation conditions. Their effective reactivity is not an additive property with respect to the intrinsic reactivities of their components. Typical surface roughness patterns progressively appear and the effective reactivity increases with time until it reaches a steady state value. In a previous work, the steady-state behavior of a 3D C/C composite has been modeled and explained. Here, the work has been extended to address the transient regime behavior. The surface roughness evolution and the effective reactivity are computed versus time. The model is validated by comparison with experimental data. These theoretical results provide for the first time a comprehensive understanding of the complex ablation process occurring at the surface of dense C/C composites.