Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Numerical Simulation of an Electric Thruster Plume Behavior Using the PIC-DSMC Method

PIC-DSMC 방법을 이용한 전기추력기 플룸 해석

  • Kang, Sang Hun (Department of Aerospace System Engineering, Sejong University) ;
  • Jun, Eunji (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology)
  • Received : 2021.04.16
  • Accepted : 2021.07.18
  • Published : 2021.08.31
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Abstract

To develop technologies for the stable operation of electric propulsion systems, the exhaust plume behavior of electric thrusters was studied using PIC-DSMC(particle-in-cell and direct simulation Monte Carlo). For the numerical analysis, the Simple Electron Fluid Model using Boltzmann relation was employed, and the charge and momentum exchanges due to atom-ion collisions were considered. The results of this study agreed with the plasma potentials measured experimentally. Near the thruster exit, active collisions among particles and charge exchanges created slow ions and fast atoms, which were expected to significantly affect the trajectory and velocity of the thruster exhaust plume.

2000년 대에 들어 가파르게 성장하고 있는 우주비행체용 전기추진시스템의 안정적인 운영기술 개발을 위해, PIC-DSMC를 이용하여 전기추력기의 배기플룸의 거동을 해석하였다. 해석 방법에서 Boltzmann 관계식을 이용한 Simple Electron Fluid Model을 적용하였고, 원자-이온 간 충돌에 의해 발생하는 전하 교환 및 운동량 교환을 함께 고려하였다. 본 연구의 해석결과는 실험에서 계측한 플라즈마 전위값을 비교적 잘 예측하였다. 추력기 출구 근처에서는 활발한 입자 간 충돌 및 원자-이온 간 전하 교환으로 인해, 느린 이온 및 빠른 원자가 생성되었으며, 추력기 배기플룸의 궤적 및 속도에 중요한 영향을 미칠 것으로 예측되었다.

Keywords

References

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