Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Thrust Characteristics of Through-type Pintle Nozzle at Operating Altitudes Conditions

작동 고도에 따른 관통형 핀틀 노즐의 추력 특성 연구

  • Jeong, Kiyeon (Currently Core Tech R&D Lab, LIG Nex1 Co., Ltd.) ;
  • Hong, Ji-Seok (Department of Mechanical and Aerospace Engineering, Korea Aerospace University) ;
  • Heo, Junyoung (The 4th R&D Institute - 1st Directorate, Agency for Defense Development) ;
  • Sung, Hong-Gye (School of Mechanical and Aerospace Engineering, Korea Aerospace University) ;
  • Yang, Juneseo (The 4th R&D Institute - 1st Directorate, Agency for Defense Development) ;
  • Ha, Dongsung (The 4th R&D Institute - 1st Directorate, Agency for Defense Development)
  • Received : 2016.04.27
  • Accepted : 2016.07.12
  • Published : 2016.08.01
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Abstract

Numerical simulations have been performed to investigate thrust characteristics of a through-type pintle nozzle with or without flow separation at various operating altitudes. The low Reynolds number $k-{\varepsilon}$ with compressibility correction proposed by Sarkar are applied. The detail flow structures are observed and static pressures along nozzle wall are compared with experimental results. The flow separation in the pintle nozzle disappears and jet plume strongly expands as its operating altitude increases. To evaluate the thrust characteristics, the momentum term and pressure term of thrust are analyzed. Thrust and thrust coefficient at altitude 20 km are about 10% more than them at the ground 0km.

작동 고도에 따라 노즐 내부에서 박리유동이 발생 또는 미발생 하는 관통형 핀틀노즐의 추력의 특성을 파악하기 위해 수치적 연구를 수행하였다. 난류모델은 저 레이놀즈 수 $k-{\varepsilon}$ 모델과 압축성 보정 모델인 Sarkar 모델을 적용하여, 핀틀 노즐의 내부 유동장을 관찰하고 노즐 벽면에서의 압력을 실험데이터와 비교하였다. 작동고도가 높아질수록 외기의 압력은 낮아지므로 낮은 고도에서의 유동 박리는 사라지고 제트의 팽창은 커진다. 추력특성을 분석하기 위해 추력을 추력의 모멘텀항과 압력항으로 나누어 분석하였다. 고도가 높아질수록 저고도에서의 박리로 인해 감소된 압력회복이 증가하고, 추력의 압력항이 증가하여 추력과 추력계수는 증가한다. 고도 20 km 조건에서는 지상에 비해 추력과 추력계수가 약 9% 증가한다.

Keywords

References

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