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Benchmark Shock Tube Experiments of Radiative Heating Relevant to Earth Re-entry

机译:基准冲击管试验与地球再入相关的辐射加热

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Detailed spectrally and spatially resolved radiance has been measured in the Electric Arc Shock Tube (EAST) facility for conditions relevant to high speed entry into a variety of atmospheres, including Earth, Venus, Titan, Mars and the Outer Planets. The tests that measured radiation relevant for Earth re-entry are the focus of this work and are taken from campaigns 47, 50, 52 and 57. These tests covered conditions from 8 km/s to 15.5 km/s at initial pressures ranging from 0.05 Torr to 1 Torr, of which shots at 0.1 and 0.2 Torr are analyzed in this paper. These conditions cover a range of points of interest for potential flight missions, including return from Low Earth Orbit, the Moon and Mars. The large volume of measurements available from EAST is useful for statistical analysis of radiation data, but is problematic for identifying representative experiments for performing detailed analysis. Therefore, the intent of this paper is to select a subset of benchmark test data that can be considered for further detailed study. These benchmark shots are intended to provide more accessible data sets for future code validation studies and facility-to-facility comparisons. The shots that have been selected as benchmark data are the ones in closest agreement to a line of best fit through all of the EAST results, whilst also showing the best experimental characteristics, such as test time and convergence to equilibrium. The EAST data are presented in different formats for analysis. These data include the spectral radiance at equilibrium, the spatial dependence of radiance over defined wavelength ranges and the mean non-equilibrium spectral radiance (so-called "spectral non-equilibrium metric"). All the information needed to simulate each experimental trace, including free-stream conditions, shock time of arrival (i.e. x-t) relation, and the spectral and spatial resolution functions, are provided.
机译:在电弧冲击管(East)设施中测量了详细的光谱和空间分辨的光线,用于高速进入各种大气中的高速入口,包括地球,金星,泰坦,火星和外部行星。对地球重新进入的测量辐射的测试是这项工作的重点,并从活动47,50,52和57中获取。这些测试在0.05的初始压力下从8km / s至15.5公里/秒的条件覆盖了条件在本文中分析了第01至1托,其中0.1和0.2托的射击。这些条件涵盖了潜在的飞行任务的一系列兴趣点,包括从低地球轨道,月球和火星返回。从东部可获得的大量测量对于辐射数据的统计分析是有用的,但对于识别表演详细分析的代表性实验是有问题的。因此,本文的目的是选择可以考虑进一步详细研究的基准测试数据的子集。这些基准镜头旨在为未来的代码验证研究和设施到设施比较提供更多可访问的数据集。被选为基准数据的镜头是最接近所有东方结果的最佳契合线的镜头,同时也显示出最佳实验特性,例如测试时间和均衡的收敛性。东数据以不同的分析形式呈现。这些数据包括平衡的光谱辐射,辐射的空间依赖性在限定的波长范围内和平均非平衡光谱光谱(所谓的“光谱非平衡度量”)。提供了模拟每个实验迹线所需的所有信息,包括自由流条件,到达的冲击时间(即X-T)和光谱和空间分辨率函数。

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