Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Numerical Study on an E-D Nozzle Characteristics with Various Pintle Inflection Angles

핀틀 변곡 각도에 따른 E-D 노즐 특성에 대한 전산수치해석 연구

  • Park, Sanghyeon (Department of Aerospace Engineering, Graduate School of Chungnam National University) ;
  • Moon, Taeseok (Department of Aerospace Engineering, Graduate School of Chungnam National University) ;
  • Huh, Hwanil (Department of Aerospace Engineering, Chungnam National University)
  • Received : 2017.11.13
  • Accepted : 2018.06.10
  • Published : 2018.12.01
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Abstract

In this study, a numerical study was conducted to characterize the E-D nozzle which changes according to the nozzle pressure ratios. Three different numerical analysis models were designed by changing the pintle inflection angles. When the nozzle pressure ratio is low, the outside air flows into the E-D nozzle to form an open flow field. As the nozzle pressure ratio increases, the flow transition occurs to become the closed flow field where the recirculation region is isolated inside the nozzle. Also, the highest thrust coefficient was obtained in the analytical model with high pintle inflection angle at all nozzle pressure ratios.

본 논문에서는 E-D 노즐 공압 실험 연구의 선행 연구로써, 노즐 압력비에 따라 변화하는 E-D 노즐특성 파악을 위한 해석적 연구가 수행되었다. 설계 변수 중, 핀틀 변곡 각도를 하나의 변수로 하여 서로 다른 세 가지 수치해석 모델을 설계하였다. 노즐 압력비가 낮을 때는 E-D 노즐 내부로 외부 대기가 유입되어 개방 유동장이 형성되었다. 노즐 압력비가 높아짐에 따라 노즐 내부에 재순환 영역이 고립되는 폐쇄 유동장으로 유동 천이가 발생함을 확인하였다. 또한, 전체 노즐 압력비 구간에서 핀틀 변곡 각도가 높은 해석 모델에서 가장 높은 추력 계수가 도출되었다.

Keywords

References

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