• Title, Summary, Keyword: Teflon ablation

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Theoretical Modeling of Pulsed Plasma Thruster Performance with Teflon Ablation

  • Cho, Mingyoung;Sung, Hong-Gye
    • International Journal of Aeronautical and Space Sciences
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    • v.18 no.1
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    • pp.138-143
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    • 2017
  • A performance analysis for a pulsed plasma thruster(PPT) has been conducted to predict the thrust and current change. Two models were implemented - a one-dimensional lumped circuit analysis model and the Teflon ablation model provided by Michael Keidar. The circuit model incorporating resistance and inductance models was adapted to predict the magnitude of the discharge current. Numerical simulations like current discharge rates with different voltages were reasonably well compared with experimental data. The effects of Teflon ablation on thruster characteristics were investigated.

An unsteady modeling of the Teflon Ionization for a Pulsed Plasma Thruster Performance (펄스형 플라즈마 추력기 성능해석을 위한 테프론의 이온화 비정상 모델링 연구)

  • Cho, Mingyoung;Sung, Hong Gye
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.8
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    • pp.697-703
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    • 2017
  • A teflon ionization modeling has been conducted to predict the performance of a PPT(Pulsed Plasma Thruster). One dimensional unsteady circuit model and Teflon ablation model were implemented. The Saha equation was adapted to predict the ionization of Carbon and Fluorine gas. The lumped circuit model including a resistance and a inductance model of a plasma was adapted to predict the magnitude of a discharge current. Numerical simulation results had good agreements with pervious research. The degree of current change according to PPT operating voltage was examined.

초고압 대용량 차단부의 노즐용 강화테프론의 특성

  • Sin, Yeong-Jun;Gang, Dong-Pil;Park, Gyeong-Yeop;Song, Won-Pyo;Lee, Cheol-Hyeon;Hong, Chang-Bae
    • Proceedings of the KIEE Conference
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    • pp.1159-1161
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    • 1995
  • The pure PTFE nozzles may not be used in the GCB with very high interrupting capacity because of their excessive ablation and carbonization. But it is known that the nozzles with filler can show good performances at the extremely high inetrrupting currents of 50kA or 63kA. So, the manufacturing process of filled Teflon has been carefully studied. Then several specimens have been prepared for the experiments and analyses of their mechanical and electrical characteristics. Finally the high power arc tests have been conducted to the Teflon nozzle with filler of $Al_2O_3$. The results of experiments and tests show that the filled Teflon nozzle has superior mechanical characteristics, comparable electrical characteristics to a pure Teflon nozzle and a distinguished endurance against high power arcs.

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