Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Thrust and Aerodynamic Load Characteristics of an Internal Pintle Thruster

노즐 목 내부형 핀틀추력기의 추력 및 공력하중 특성

  • Choi, Junsub (Department of Aerospace Engineering, Graduate School at Chungnam National University) ;
  • Kim, Dongyeon (Department of Aerospace Engineering, Graduate School at Chungnam National University) ;
  • Huh, Hwanil (Department of Aerospace Engineering, Chungnam National University)
  • Received : 2017.04.04
  • Accepted : 2017.05.12
  • Published : 2017.06.01
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Abstract

Numerical computations are performed to investigate the effect of pintle stroke on the performance of an internal pintle thruster. Results show that the thrust control ratio was less than 2% and the aerodynamic load ratio was 22% as the pintle stroke increased. The flow past the nozzle throat rapidly expanding because of the shape of the pintle, and a shock wave was generated. Particularly, at the pintle stroke distance of 4 and 5 mm, the shock wave hit the wall of the nozzle, results in peeling bubbles. Depending on the altitude, the thrust increased and the aerodynamic load decreased, but the difference was as small as 1.5%. In the presence of the bore, the reduction of the pintle tip area resulted in a decrease in aerodynamic load.

노즐 목 내부형 핀틀추력기에서 핀틀 행정거리가 추력기 성능에 미치는 영향에 대해 전산수치해석 연구를 수행하였다. 해석결과 핀틀 행정거리가 증가함에 따라 추력조절비는 2% 이내였고, 공력하중비는 최대 22%로 확인되었다. 노즐 목을 지난 유동이 핀틀의 형상으로 인해 급격히 팽창하며 충격파가 발생하였다. 특히, 핀틀 행정거리 4, 5 mm에서는 충격파가 노즐 벽면에 부딪치며 박리거품이 발생하였다. 고도에 따라서는 추력은 증가하였고 공력하중은 감소하였지만, 그 차이가 1.5% 이내로 작았다. 보어가 있는 경우 핀틀 팁의 면적 감소로 공력하중이 감소하는 결과를 보였다.

Keywords

References

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