Power consumption of a Philberth thermal probe in ice sheet exploration

Published on Sep 1, 2020in Cold Regions Science and Technology3.726
· DOI :10.1016/J.COLDREGIONS.2020.103114
Li Yazhou5
Estimated H-index: 5
(JLU: Jilin University),
Yang Yang3
Estimated H-index: 3
(JLU: Jilin University)
+ 2 AuthorsPavel Talalay13
Estimated H-index: 13
(JLU: Jilin University)
Sources
Abstract
Abstract As a useful equipment for ice sheet exploration, many Philberth thermal probe designs have been proposed for use on Earth or extraterrestrial planets. The classic method for calculating the power consumption of a Philberth thermal probe can be modified by assuming a reasonable thermal head efficiency. The influence of various parameters on the critical refreezing length and the power consumption of the thermal head and lateral heater are evaluated using the improved method. The power consumption of the thermal probe increases as the diameter, length, and penetration rate increase and decreases as the ice temperature increases. The efficiency of the thermal head has no influence on the total power consumption of the thermal probe. There exists an optimal diameter and efficiency of thermal head. While drilling an ice sheet, the power consumption of the lateral heater reduces gradually, and thus, moving the excess power of the lateral heater to the thermal head is a good method of increasing the penetration rate. Moreover, it is also suggested that the maximum working voltage of the thermal head should be as high as possible, and the lateral body of the thermal probe should be heated in sections.
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#1Pavel Talalay (JLU: Jilin University)H-Index: 13
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Abstract Electrically heated hot points are widely used for drilling in glaciers and ice sheets. To study the effect of input power, axial load, ice temperature, shape, and material of the thermal tip on the hot-point rate of penetration (ROP), a 0.8-m-long drill with 18 changeable thermal tips was designed. The ROP increased with input power for all the thermal tips. Seven tip shapes (cylinder, cosine, ogive, sphere, catenary, parabola, and cone) were tested at the same power level, axial load,...
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