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Thermal Probe Enhanced with Pulsed Plasma Discharges for Efficient Ice Penetration
Journal of Thermophysics and Heat Transfer ( IF 2.1 ) Pub Date : 2021-04-23 , DOI: 10.2514/1.t6244
Guglielmo Daddi 1 , Fernando Mier-Hicks 2
Affiliation  

Pulsed plasma discharges are investigated here as a means of reducing the power necessary for a thermal probe to penetrate an ice sheet. When a high-energy plasma discharge occurs in ice, the ensuing shockwave fractures the ice field and reduces its thermal conductivity. If this reduction is sufficient in both magnitude and geometric extension, it can decrease the heating power necessary to keep the thermal probe descending. This concept is investigated from a theoretical point of view by modeling in a finite element thermal analysis the effects of a cracked ice region on the thermal probe’s performance. Thermal conductivity reduction and cracked region extent are introduced as the parameters that predict power savings. An experimental setup was also created to allow 80 J discharges through an ice sample at a voltage of 40 kV. The system was used in combination with a commercial thermal properties analyzer to derive thermal conductivity reduction values to feed to the system. The cracked region was topologically divided into two regions with different cracking behavior, and the thermal conductivity of each region was measured.



中文翻译:

脉冲等离子体放电增强了热探针,可有效穿透冰层

在此研究脉冲等离子体放电,以减少热探针穿透冰盖所需的功率。当冰中发生高能等离子体放电时,​​随之而来的冲击波使冰场破裂,并降低了其热导率。如果这种减小在幅度和几何扩展上都足够,则可以减小保持热探针下降所需的加热功率。从理论的角度对这一概念进行了研究,方法是在有限元热分析中对破裂的冰区对热探针性能的影响进行建模。引入热导率降低和裂纹区域扩展作为预测功率节省的参数。还创建了一个实验装置,以允许在40 kV的电压下通过冰样品进行80 J放电。该系统与商用热性能分析仪结合使用,可得出热导率降低值,以供入系统。将破裂区域在拓扑上划分为具有不同破裂行为的两个区域,并测量每个区域的热导率。

更新日期:2021-04-23
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