• Title/Summary/Keyword: Field Emission Electric Propulsion

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Survey on Research and Development of Field Emission Electric Propulsion Thrusters (전계방출 전기추진 추력기 연구개발 현황)

  • Park, Jeongjae;Lee, Bok Jik;Jeung, In-Seuck
    • Journal of the Korean Society of Propulsion Engineers
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    • v.25 no.5
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    • pp.36-52
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    • 2021
  • As the application of nano-satellites constellation increases worldwide in the wake of New Space era, there is growing demand for the development of thrusters for precise attitude and orbit control of small satellites. Field Emission Electric Propulsion(FEEP) thruster uses a liquid metal as a propellant and accelerates the ionized liquid metal through a strong electric field at the tip of the metal surface. FEEP thruster technology is suitable for nano-satellites which require various missions for attitude and orbit control, because it provides thrust ranging from 1 µN to 1 mN with high specific impulse up to about 10,000 s and can be miniaturized due to its simple structure. In this paper, the basics of FEEP thrusters are introduced, then the current status of research and development of FEEP thrusters are presented.

The use of Interfacial Graphene to Carbon nanotube Point emitter for Field Emission Electric Propulsion (그래핀을 이용한 탄소나노튜브 전계방출소자 계면 개질 및 전자 추진계 응용)

  • Lee, Jeong Seok;Kang, Tae June;Kim, Dae Weon;Kim, Yong Hyup
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.11
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    • pp.1004-1009
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    • 2012
  • Carbon nanotube are nanostructure with extraordinary field emission properties like high current density, low driving voltage and long time stability, because of their high electrical conductivity, high aspect ratio for geometrical field enhancement and superior thermal stability. But, there is some problem to mate metal and carbon nanotube, we have resolved this problem by using interfacial graphene. This approach takes advantage of superior electric and thermal conductivity between metal and carbon nanotube and shows superior performance compared to the existing field emitters. This result shows that such a carbon nanotube emitter in a stage where it can be used for Field Emission Electric Propulsion (FEEP).

A Two-Dimensional Particle-in-cell Simulation for the Acceleration Channel of a Hall Thruster

  • Lim, Wang-Sun;Lee, Hae-June;Lee, Jong-Sub;Lim, Yu-Bong;Seo, Mi-Hui;Choe, Won-Ho;Seon, Jong-Ho;Park, Jae-Heung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.03a
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    • pp.557-560
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    • 2008
  • A two-dimensional particle-in-cell(PIC) simulation with a Monte-Carlo Collision(MCC) has been developed to investigate the discharge characteristics of the acceleration channel of a HET. The dynamics of electrons and ions are treated with PIC method at the time scale of electrons in order to investigate the particle transport. The densities of charged particles are coupled with Poisson's equation. Xenon neutrals are injected from the anode and experience elastic, excitation, and ionization collisions with electrons, and are scattered by ions. These collisions are simulated by using an MCC model. The effects of control parameters such as magnetic field profile, electron current density, and the applied voltage have been investigated. The secondary electron emission on the dielectric surface is also considered.

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Jet A-1 Coking Tests under Conditions Simulating Gas Turbine Combustor (가스터빈 연소기 모사 조건에서의 Jet A-1 코킹시험)

  • Lee, Dain;Lee, Kangyeong;Han, Sunwoo;Ahn, Kyubok;Ryu, Gyong Won
    • Journal of the Korean Society of Propulsion Engineers
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    • v.26 no.1
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    • pp.1-11
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    • 2022
  • In a gas turbine, fuel is exposed to a high temperature environment until it is fed to the combustor through the injector. Hydrocarbon fuels can coke under high temperature conditions, which can cause coking material to deposit on fuel lines or block the injector passages. In this study, a specimen simulating a fuel line located inside a gas turbine and Jet A-1 were heated using electric devices. Jet A-1 coking tests were performed by changing the wall temperature of the stainless steel specimen and the temperature of Jet A-1 supplied to the specimen. After the coked specimens were cut, the coking material and the inner surface were analyzed using an energy dispersive X-ray spectrometer and a field emission scanning electron microscope.