Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Performance Analysis of the Pintle Thruster Using 1-D Simulation-II : Unsteady State Characteristics

1-D 시뮬레이션을 활용한 핀틀추력기의 성능해석-II : 비정상상태 특성

  • Noh, Seonghyeon (Department of Aerospace Engineering, Graduate School at Chungnam National University) ;
  • Kim, Jihong (Department of Aerospace Engineering, Graduate School at Chungnam National University) ;
  • Huh, Hwanil (Department of Aerospace Engineering, Chungnam National University)
  • Received : 2015.03.06
  • Accepted : 2015.03.19
  • Published : 2015.04.01
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Abstract

This paper describes how to apply one-dimensional simulation to predict unsteady state characteristics of the cold-gas pintle thruster. Mass flow rate, chamber pressure, and nozzle exit pressure are key parameters for thrust control. Chamber pressure rose and fell monotonously with the pintle stroke variation, while thrust variation was different from chamber pressure variation. During the forward pintle stroke operation, the thrust value tended to decrease initially and returned to increase when pintle speed and chamber free volume exceed some specified value. Even though one-dimensional simulation has the limitations to predict unsteady state characteristics, it is still useful for initial performance assessment of various thrusters which adopt an altitude compensation nozzle such as a dual-bell nozzle, prior to experiment or numerical analysis.

본 연구는 공압시험용 핀틀추력기의 비정상상태 특성을 예측하기 위한 1-D 시뮬레이션 적용법을 기술한다. 추력을 제어하기 위해 질량유량, 챔버압력, 노즐출구 압력은 핵심 매개변수이다. 챔버압력은 핀틀 스트로크 변화에 따라 단조롭게 증감하였지만, 추력은 챔버 압력의 변화와 다른 양상을 보였다. 핀틀이 전진할 때 핀틀 속도와 챔버 자유체적이 특정 값을 초과하면 추력 값은 초기에 감소하다가 다시 증가하는 경향을 보였다. 1-D 시뮬레이션은 비정상 상태 특성을 예측하는데 한계가 있지만 실험이나 수치해석 이전에 듀얼벨 노즐과 같은 다양한 고도보정노즐 추력기의 초기 성능 평가에 여전히 유용하다.

Keywords

References

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  1. Experimental Study on Unsteady-state Characteristics of a Pintle Thruster with Variable Pintle Speeds vol.44, pp.3, 2016, https://doi.org/10.5139/JKSAS.2016.44.3.247