thermal analysis for a langmuir probe to be used in...
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Thermal Analysis for a Langmuir Probe to be used in a Re-entry
CubeSat Mission
Angel B. Menéndez Cifuentes, Jyh-Ching Juang, and Jiun-Jih Miau
Speaker: Angel Menéndez
Department of Aeronautics and Astronautics
National Cheng Kung University
Tainan, Taiwan, R. O. C.
Proceedings of the 7th Nano-Satellite Symposium
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Outline
• Motivation
• Literature Review
• Designs of Langmuir Probes
• Results and Discussion
• Concluding Remarks
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Motivation (1/2)
• Re-entry CubeSat (3U)
• Transmit data before impact
• Langmuir probe
• OBC thermally insulated from exterior
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• FLP located on the exterior
• Electrically conductive and thermally conductive
• Spacial considerations for heat sink
Motivation (2/2)
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Literature Review (1/3)
Fish, C.S., Swenson, C.M., Crowley, G. et al. 2014
• Dynamic Ionosphere CubeSat Experiment (DICE) mission
• Two identical 1.5U CubeSats with two single Langmuir probes each for in situ measurements
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Literature Review (2/3)
Cacace, M., Batal, T., Corre, Y., et al. 2015
• Plasma measurements in bigger apparatus include actively cooling systems
• WEST project (W-Environment in Steady-State Tokamak)
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Tokamak example www.euro-fusion.org
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Literature Review (3/3)
Field, E.S. 2011
• Arrays of individually addressable probes with 600μm-diameter tips
• Up to 25 probes per 1cm-square tile
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Design of Langmuir Probes (1/2)
• Flush mounted double probe
• Graphite head and harness
• No aerodynamic interference
• Measurement subject to CubeSat boundary
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Design of Langmuir Probes (2/2)
• Needle tip triple probe
• Stainless steel, tungsten tips and harness
• Ceramic head and heat resistant adhesive filling
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TPS Re-entry Temperature
*Data provided by von Karman Institute of Fluid Dynamics
**Descent ranging from 100Km-30Km
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0
200
400
600
800
0 100 200 300 400 500 600 700
Tem
per
atu
re (
⁰C)
Time (s)
Outer Temperature Profile at Side Panel
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Maximum Temperatures During Re-entry
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1925 ⁰C
748 ⁰C
887 ⁰C
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Results and Discussion (1/3)
• Maximum operational temperature of OBC 85⁰C
• Temperature at 7cm harness 87.97 ⁰C
• Plasma contact area too big
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Results and Discussion (2/3)
• Harness length of 10cm selected for testing
• At 6cm, temperature dropped from 89⁰C to 67⁰C by placing directly and behind TPS
• Minimized exposure area
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Results and Discussion (3/3)
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Concluding Remarks
• Needle tip triple probe selected
• Tungsten tips and harness selected
• 4mm diameter fiberglass cover for harness as heat sink
• 6cm long harness enough
• Place probe head behind Fiberfrax and SiC TPS
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Thank you for your attention
Questions
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Cacace, M., Batal, T., Corre, Y., et al. 2015
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Exterior reference temperature profiles
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