Plasma Wind Tunnel Investigation of European Ablators in Nitrogen/Methane Using Emission Spectroscopy

R. Wernitz, C. Eichhorn, T. Marynowski, G. Herdrich
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引用次数: 11

Abstract

For atmospheric reentries at high enthalpies ablative heat shield materials are used, such as those for probes entering the atmosphere of Saturn’s moon Titan, such as Cassini-Huygens in December, 2004. The characterization of such materials in a nitrogen/methane atmosphere is of interest. A European ablative material, AQ60, has been investigated in plasma wind tunnel tests at the IRS plasma wind tunnel PWK1 using the magnetoplasma dynamic generator RD5 as plasma source in a nitrogen/methane atmosphere. The dimensions of the samples are 45 mm in length with a diameter of 39 mm. The actual ablator has a thickness of 40 mm. The ablator is mounted on an aluminium substructure. The experiments were conducted at two different heat flux regimes, 1.4 MW/m2 and 0.3 MW/m2. In this paper, results of emission spectroscopy at these plasma conditions in terms of plasma species’ temperatures will be presented, including the investigation of the free-stream species, N2 and , and the major erosion product C2, at a wavelength range around 500 nm–600 nm.
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利用发射光谱技术研究欧洲氮/甲烷烧蚀器的等离子体风洞
对于以高焓再入大气层的情况,使用烧蚀隔热材料,例如进入土星卫星土卫六大气层的探测器,如2004年12月的卡西尼-惠更斯号。这类材料在氮/甲烷大气中的表征是令人感兴趣的。采用磁等离子体动态发生器RD5作为等离子体源,在氮气/甲烷大气中,在IRS等离子体风洞PWK1上对一种欧洲烧蚀材料AQ60进行了等离子体风洞试验。样品的尺寸为长45mm,直径39mm。实际的烧蚀器厚度为40mm。烧蚀器安装在铝制底座上。实验在1.4 MW/m2和0.3 MW/m2两种不同的热流密度下进行。本文将介绍这些等离子体条件下等离子体物质温度的发射光谱结果,包括对自由流物质N2和主要侵蚀产物C2的研究,波长范围约为500 nm - 600 nm。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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