Understanding High Recession Rates of Carbon Ablators Seen in Shear Tests in an Arc Jet
Understanding High Recession Rates of Carbon Ablators Seen in Shear Tests in an Arc Jet
复制标题
了解电弧喷射剪切测试中碳烧蚀剂的高衰退率
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Maclean
中科院分区：
文献类型：
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作者：
D. Driver;Michael W. Olson;M. Barnhardt;M. Maclean
酚醛浸渍碳烧蚀机 (PICA) 的电弧喷射剪切测试中的高衰退率激发了对 FiberForm（用于制造 PICA 的碳预制件）的一系列测试和分析。在空气和纯氮气中对 FiberForm 进行了电弧喷射测试，以了解停滞和剪切配置。氮气测试显示很少或没有衰退，而 FiberForm 的空气测试显示 ed 衰退率与 PICA 相似（根据密度差异进行调整时）。虽然不能排除机械侵蚀的可能性，但这是这样做的第一步。使用 DPLR 内的碳氧化边界条件进行分析来预测 FiberForm 的衰退率。分析表明，在剪切测试中看到的许多异常衰退行为可能只是非飞行类测试配置（测试物品上游的铜）的伪影，是铜上不相似的焓和氧浓度分布的结果。还研究了形状变化的影响，结果表明形状变化的影响相对较小。
High rates of recession in arc jet shear test s of Phenolic Impregnated Carbon Ablator (PICA) inspired a series of tests and analysis on FiberForm (a carbon preform used in the fabrication of PICA). Arc jet tests were p erformed on FiberForm in both air and pure nitrogen for stagnation and shear configurations . The nitrogen tests showed little or no recession, while the air tests of FiberForm show ed recession rates similar to that of PICA (when adjusted for the difference in density). While mechanical erosion can not be ruled out, this is the first step in doing so. Anal ysis using a carbon oxidation boundary condition within DPLR was used to predict the recession rate of FiberForm. The analysis indicates that much of the anomalous recession behavior seen in shear tests may simply be an artifact of the non-flight like test conf iguration (copper upstream of the test article) a result of dis- similar enthalpy and oxygen concentration profiles on the copper. Shape change effects were also investigated and shown to be relatively small.