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The ESA ARC Project: Ablation Radiation Coupling for hypervelocity re-entry with low density type ablators

机译：ESA ARC项目：消融辐射耦合，用于高密度型烧蚀器的超细型重新输入

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The ARC project is an ESA funded project aiming to evaluate critical issues of ablation radiation coupling for hypervelocity ( ＞ 10km/s) return missions of capsules equipped with carbon phenolic type heat shields. The plasma environment of such return trajectories strongly radiates, while the ablation of the heat shield ejects species into the boundary layer. These species, which can include strong radiators, interact with the near-wall plasma resulting in further reactions, diffusion, and radiation, producing ablation-radiation coupling and blocking effects. The only recent flight data for such missions with carbon phenolic ablators comes from the Hayabusa and Stardust missions, which were observed during re-entry. However, the high energy radiation (vacuum ultraviolet and beyond) could not be measured due to atmospheric absorption. Theoretical estimations and numerical modelling predict that a considerable proportion of the radiation is emitted at these wavelengths. Hence the goal of the ARC project is to use ground-based facilities to perform radiation measurements with vacuum ultraviolet capabilities over ablating samples and assess radiation-ablation coupling at conditions that are relevant to such fast return mission conditions. Calibrated measurements of vacuum ultraviolet radiation with an ablating surface in hypervelocity entry conditions are presented from facilities in Australia, Germany and France.
机译：所述ARC项目是一个ESA资助的项目旨在评估消融辐射耦合的关键问题为超高速（>10公里/ s）的配备有碳的酚醛型热屏蔽胶囊的返回任务。这种返回轨迹的等离子体环境强烈辐射，而防热罩弹出操作物种入边界层的烧蚀。这些物质，其可以包括强散热器，相互作用与近壁等离子体导致进一步的反应，扩散和辐射，产生烧蚀辐射耦合和阻断作用。对于这样的任务碳酚醛消融器最近只有飞行数据来自隼和星尘任务，其再入过程中观察。然而，高能量辐射（真空紫外线及以后）不能由于大气吸收测量。理论估计和数值模拟预测的辐射的相当大的比例是在这些波长发射。因此，ARC项目的目标是使用基于地面的设施，以在消融样品执行与真空紫外线辐射的能力的测量，并在该相关的这样的快速返回任务条件的条件评估辐射消融耦合。在超高速进入条件的消融表面的真空紫外线辐射的校准测量是从澳大利亚，德国，法国设施呈现。

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