Visual observation of meteorite ablation in plasma wind tunnel experiments

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-08-08 DOI:10.1016/j.icarus.2024.116249

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Abstract

A set of 28 different meteorites was tested in 32 ablation experiments in the plasma wind tunnel PWK1 at the Institute of Space Systems. All meteorites were exposed to the same flow condition in consecutive experiments. This paper presents the detailed analysis of high-resolution images taken by DSLR cameras during 26 experiments on 22 different meteorites. It is seen that the ablation behavior of the meteorites differs in the way the material melts and flows downstream. While some meteorites appeared more viscous and most material remained connected to the main body, other samples suggest a much lower viscosity as the material was carried downstream and released droplets to the flow. Most droplets of molten material were seen for the two most carbon rich samples from meteorites Murchison and Dhofar 1575. The release of blue colored particles was observed for several meteorites, independent of the viscosity. In contrast to the molten droplets, the blue particles also traveled up to a few millimeters upstream. The abundance of these blue particles is linked to the iron content. Close to no particles or droplets were observed for achondritic samples.

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等离子风洞实验中陨石烧蚀的目视观测

空间系统研究所的等离子风洞 PWK1 对一组 28 种不同的陨石进行了 32 次烧蚀实验。在连续的实验中，所有陨石都暴露在相同的流动条件下。本文详细分析了单反相机在对 22 块不同陨石进行的 26 次实验中拍摄的高分辨率图像。可以看出，陨石的烧蚀行为在材料熔化和向下游流动的方式上有所不同。一些陨石的粘度较高，大部分物质仍与主体相连，而其他样本的粘度则低得多，因为物质被带往下游，并向流动中释放出液滴。大部分熔融物质液滴出现在两块含碳量最高的陨石样本中，它们分别来自默奇森和佐法尔 1575 号陨石。多块陨石都释放出了蓝色颗粒，与粘度无关。与熔融液滴不同，蓝色颗粒也会向上游移动几毫米。这些蓝色颗粒的丰富程度与铁的含量有关。在非晶体样本中几乎没有观察到颗粒或液滴。

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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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.