Self-generated clouds of micron-sized particles as a promising way of a Solar Probe shielding from intense thermal radiation of the Sun

Dombrovsky Leonid A.; Reviznikov Dmitry L.; Kryukov Alexei P.; Levashov Vladimir Yu

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Self-generated clouds of micron-sized particles as a promising way of a Solar Probe shielding from intense thermal radiation of the Sun

机译：将微米尺寸的颗粒的自成云作为太阳能探测器屏蔽太阳辐射的有希望的方式

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An effect of shielding of an intense solar radiation towards a solar probe with the use of micron-sized SiC particles generated during ablation of a composite thermal protection material is estimated on a basis of numerical solution to a combined radiative and heat transfer problem. The radiative properties of particles are calculated using the Mie theory, and the spectral two-flux model is employed in radiative transfer calculations for non-uniform particle clouds. A computational model for generation and evolution of the cloud is based on a conjugated heat transfer problem taking into account heating and thermal destruction of the matrix of thermal protection material and sublimation of SiC particles in the generated cloud. The effect of light pressure, which is especially important for small particles, is also taken into account. The computational data for mass loss due to the particle cloud sublimation showed the low value about 1 kg/m(2) per hour at the distance between the vehicle and the Sun surface of about four radii of the Sun. This indicates that embedding of silicon carbide or other particles into a thermal protection layer and the resulting generation of a particle cloud can be considered as a promising way to improve the possibilities of space missions due to a significant decrease in the vehicle working distance from the solar photosphere. (C) 2017 Elsevier Ltd. All rights reserved.

机译：在综合辐射和传热问题的基础上估计在混合和传热问题的基础上估计在混合复合热保护材料中产生的微米尺寸SiC颗粒朝阳探头展示朝向太阳探测的效果。使用MIE理论计算颗粒的辐射性能，并且光谱两磁通模型用于非均匀粒子云的辐射转移计算。云的生成和演化的计算模型基于共轭传热问题，考虑了热保护材料矩阵的加热和热破坏和产生的云中的SiC粒子的升华。还考虑了对小颗粒特别重要的轻压的影响。由于粒子云升华由于粒子云升华而进行质量损失的计算数据在车辆和太阳约四个半径的太阳表面之间的距离处为每小时约1kg / m（2）的低值。这表明将碳化硅或其他颗粒嵌入热保护层和所得到的颗粒云的产生可以被认为是提高空间任务可能性的有希望的方式，这是由于车辆与太阳能工作距离显着下降，因此Photosphere。（c）2017 Elsevier Ltd.保留所有权利。

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《Journal of Quantitative Spectroscopy & Radiative Transfer》 |2017年第2017期|共10页
作者
Dombrovsky Leonid A.; Reviznikov Dmitry L.; Kryukov Alexei P.; Levashov Vladimir Yu;
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作者单位

NCHMT Joint Inst High Temp Krasnokazarmennaya 17A Moscow 111116 Russia;

Moscow Inst Aviat Technol Volokolamskoe Shosse 4 Moscow 125993 Russia;

Moscow Power Engn Inst Krasnokazarmennaya 14 Moscow 111250 Russia;

Moscow MV Lomonosov State Univ Inst Mech Michurinskiy Prosp 1 Moscow 119192 Russia;

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正文语种 eng
中图分类光学;
关键词
Solar radiation shielding; Solar Probe; Radiative transfer; Conjugated heat transfer; Micron-sized particles; Computational model;

机译：太阳辐射屏蔽;太阳能探头;辐射转移;共轭传热;微米尺寸粒子;计算模型;

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1. Self-generated clouds of micron-sized particles as a promising way of a Solar Probe shielding from intense thermal radiation of the Sun [J] . Dombrovsky Leonid A., Reviznikov Dmitry L., Kryukov Alexei P., Journal of Quantitative Spectroscopy & Radiative Transfer . 2017,第期

机译：将微米尺寸的颗粒的自成云作为太阳能探测器屏蔽太阳辐射的有希望的方式
2. Probing the non-Planckian spectrum of thermal radiation in a micron-sized cavity with a spin-polarized atomic beam [J] . Giuseppe Bimonte Physical Review, A . 2019,第3aPta1期

机译：用旋转偏振原子束探测微米尺寸腔中的热辐射的非普朗克谱
3. Numerical investigation of particle deposition inside aero-shielded solar cyclone reactor: A promising solution for reactor clogging [J] . D. Jaya Krishna, Nesrin Ozalp International Journal of Heat and Fluid Flow . 2013,第apra期

机译：空气屏蔽太阳旋风反应堆内颗粒沉积的数值研究：一种解决反应堆堵塞的有前途的解决方案
4. AN ESTIMATE OF A SOLAR PROBE PROTECTION FROM INTENSE RADIATION WITH THE USE OF PARTICLES EMBEDDED IN AN ABLATING MATERIAL [C] . Leonid A. Dombrovsky, Dmitry L. Reviznikov International Symposium on Radiative Transfer . 2016

机译：利用嵌入烧蚀材料中的颗粒的强烈辐射的太阳能探头保护估计
5. ABSORPTION AND SCATTERING OF THERMAL RADIATION BY A CLOUD OF SMALL PARTICLES [D] . NAGY, ANTHONY ROBERT, JR. 1967

机译：小颗粒团对热辐射的吸收和散射
6. Solar Blue Light Radiation Enhancement during Mid to Low Solar Elevation Periods under Cloud Affected Skies [O] . Alfio V. Parisi, Damien P. Igoe, Abdurazaq Amar, 2020

机译：云影响天空下的太阳升高期间太阳蓝光辐射增强
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。

Self-generated clouds of micron-sized particles as a promising way of a Solar Probe shielding from intense thermal radiation of the Sun

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