An Experimental Study on Heat-Flux Reduction by Electromagnetic Fields in Ionized Flows

机译：电离流中电磁场降低热通量的实验研究

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In the frame of this work an experimental study has been performed on heat-flux mitigation withinrnhigh-enthalpy ionized-argon flows by application of an external magnetic-induction field. Two differentrnaxially symmetric test models, containing water-cooled magnet coils, were investigated. The models werernmade of a material with low thermal conductivity, in order to visualize surface-temperature distribution.rnThe latter has been measured by infrared thermography. Heat-flux rates have been derived fromrnmeasured front and rear surface temperature taking into account temperature-dependent materialrncharacteristics and considering radiative-cooling exchange to the environment. Flow-field properties havernbeen quantitatively characterized by laser induced fluorescence, microwave interferometry, diode laserrnabsorption spectroscopy, electrostatic probes and Pitot probes. Remarkable measured surfacetemperaturernreductions up to 44%, and derived heat-flux mitigation up to 85%, have been observed in thernpresence of an externally applied magnetic-induction field. The influence of change in the polarity of thernelectromagnetic coils has also been measured and showed in contrast to some former studies comparablerneffects for both polarities.

机译：在这项工作的框架内，已通过施加外部磁感应场对高焓离子化氩气流中的热通量缓解进行了实验研究。研究了两个不同的轴对称测试模型，其中包含水冷电磁线圈。这些模型是用低热导率的材料制成的，以便可视化表面温度分布。后者是通过红外热成像法测量的。热通量率是从测量到的前后表面温度得出的，其中考虑了与温度有关的材料特性，并考虑了与环境的辐射冷却交换。流场性质已经通过激光诱导荧光，微波干涉法，二极管激光吸收光谱法，静电探针和皮托探针进行了定量表征。在外部施加的感应磁场的存在下，已观察到显着的测量表面温度降低幅度高达44％，派生的热通量降低幅度高达85％。还测量了电磁线圈极性变化的影响，并与一些以前的研究相反，显示了两种极性的可比作用。

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来源
《New beginnings: challenges for aerospace innovation》|2009年|p.1-13|共13页
会议地点 Manchester(GB)
作者
Ali Gülhan; Burkard Esser; Uwe Koch; Frank Siebe; Johannes Riehmer; Domenico Giordano; Detlev Konigorski;
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作者单位

German Aerospace Research Center (DLR), D-51147 Cologne, Germany Ali.Guelhan@dlr.de;

German Aerospace Research Center (DLR), D-51147 Cologne, Germany;

German Aerospace Research Center (DLR), D-51147 Cologne, Germany;

German Aerospace Research Center (DLR), D-51147 Cologne, Germany;

German Aerospace Research Center (DLR), D-51147 Cologne, Germany;

European Space Research Technology Center,2201 AZ Noordwijk ZH , The Netherlands Domenico.Giordano@esa.int;

EADS Astrium, 28361 Bremen, Germany Detlev.Konigorski@astrium.eads.net;

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原文格式 PDF
正文语种 eng
中图分类航空、航天技术的研究与探索;
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4. An Experimental Study on Heat-Flux Reduction by Electromagnetic Fields in Ionized Flows [C] . Ali Gülhan, Burkard Esser, Uwe Koch, CEAS European air and space conference . 2009

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An Experimental Study on Heat-Flux Reduction by Electromagnetic Fields in Ionized Flows

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