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首页> 外文期刊>Aerospace science and technology >Continuum breakdown and surface catalysis effects in NASA arc jet testing at SCIROCCO
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Continuum breakdown and surface catalysis effects in NASA arc jet testing at SCIROCCO

机译：SCIROCCO在NASA电弧喷射测试中的连续破坏和表面催化效应

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摘要

A facility characterization test campaign was performed for NASA in SCIROCCO Plasma Wind Tunnel, with increasing enthalpy and constant reservoir pressure. In the frame of numerical rebuilding of the experimental data, an important gap among measured and numerically predicted values of heat flux led to deep analyse the numerical methods and the models usually employed for test rebuilding. The Navier-Stokes model with chemical reacting non-equilibrium flows, denoted a lack of physical accuracy due to local rarefaction effects, as certified by means of the continuum breakdown parameter. Furthermore, the low stagnation pressure environment could influence the surface catalytic behaviour of the hemisphere copper probe, and the chemical contribution to the stagnation heat flux. At the end, a set of direct simulation Monte Carlo with partial catalytic behaviour of the probe was performed, in order to address both critical phenomena highlighted and close the gap with the measured heat fluxes, understanding the actual test chamber environment. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：在焓增加和储层压力恒定的情况下，针对SCIROCCO等离子风洞中的NASA进行了设施表征测试。在对实验数据进行数值重建的框架中，热通量的测量值和数值预测值之间的重要差距导致对通常用于测试重建的数值方法和模型进行深入分析。具有化学反应的非平衡流的Navier-Stokes模型表示由于局部稀疏效应而导致的物理精度不足，已通过连续介质击穿参数进行了验证。此外，低停滞压力环境可能会影响半球铜探针的表面催化行为，以及化学成分对停滞热通量的影响。最后，进行了一组直接模拟的蒙特卡洛模拟，该模拟具有探针的部分催化性能，以便解决突出显示的关键现象并利用测得的热通量缩小间隙，从而了解实际的测试室环境。 （C）2019 Elsevier Masson SAS。版权所有。

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