• 한국추진공학회지
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• 제12권3호
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• pp.76-86
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• 2008

다양한 에너지원들을 전력발생용으로 활용할 수 있다는 점과 화학추진기로는 얻을 수 없는 높은 분사추진속도를 구현할 수 있다는 점은 전기추진기만의 장점으로 대두된다. 수많은 비화학추진기들이 연구개발중에 있으나 현재로서는 200s에서 5000s까지의 넓은 비추력 범위를 갖는 전기추진기의 연구개발이 가장 많은 진전을 이루고 있다. 따라서 본 논문의 주요내용은 전기추진기에 할애되어 있으며 전력으로 열을 발생시켜 추력을 얻는 전열추력기(electrothermal thruster), 정전기장을 응용한 정전기추력기(electrostatic thruster)와 플라스마 상태의 고온가스를 자기장으로 가속시키는 전자기추력기(electromagnetic thruster)에 대한 작동원리, 특성 및 개발현황들을 소개한다.

• 센서학회지
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• 제33권4호
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• pp.216-223
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• 2024

Electric propulsion systems, including electrothermal, electrostatic, and electromagnetic thrusters, are promising systems for producing thrust from satellites. These systems generally operate under vacuum plasma conditions and exhibit high specific impulses and thrust-to-weight ratios. Despite their high efficiencies, electric propulsion systems are susceptible to performance variations due to physical factors such as plasma instabilities, which require an accurate diagnosis of their status during operation. In this study, we review various measurement systems adopted to diagnose electric propulsion systems operating under vacuum conditions. Specifically, we review electrical, optical, and other methods that can directly or indirectly measure the status of a thruster, with a particular focus on Hall effect thrusters. The system configurations and fundamental mechanisms of the different measurement systems are described based on case studies of the diagnosis of propulsion systems. We anticipate that this study will contribute to the efficient development and safe operation of electric propulsion systems for use in artificial satellites.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.570-573
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• 2008

In spite of many experimental studies of low-power applied-field magnetoplasmadynamic(AFMPD) thrusters, thrust efficiencies of the past thrusters are very low. Hence, drastic improvement in thrust performance is required for AF-MPD thrusters to compete against other types of electric propulsion in a moderate power regime around 10 kW. For the optimization of AF-MPD thrusters, a numerical code for the flowfield simulation is now under development. A preliminary result shows that the code can deal with a complicated mixture of the induced and applied magnetic fields, which will lead to a combination of the self-field, swirl, Hall, as well as electrothermal accelerations.