Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Analysis of the Flow Characteristics of Plug Nozzle for Cold Air Test with Pintle Shape and Operating Pressure

공압시험용 플러그 노즐의 핀틀 형상 및 작동압력에 따른 유동 특성 분석

  • Kim, Jeongjin (The 4th R&D Institute - 1st Directorate, Agency for Defense Development) ;
  • Oh, Seokjin (The 4th R&D Institute - 1st Directorate, Agency for Defense Development) ;
  • Heo, Junyoung (The 4th R&D Institute - 1st Directorate, Agency for Defense Development) ;
  • Lee, Dohyung (The 4th R&D Institute - 1st Directorate, Agency for Defense Development)
  • Received : 2018.12.25
  • Accepted : 2019.05.02
  • Published : 2019.06.01
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Abstract

The thrust control calculation according to the operation of plug nozzle for cold air test and the analysis of the flow characteristics of the pintle shape and operation pressure are performed. The numerical computation was verified by comparing the flow structure and the coefficient of thrust with the experimental data. It was confirmed that the nozzle throat was formed at the design position on each pintle shape, and thrust control up to 1:8 was achieved only by the stroke change. Finally, although the aerospike nozzle is autonomous, it is unfavorable in the under_expansion condition, if it is designed for a very low nozzle pressure ratio.

공압시험용 플러그 노즐 구동에 따른 추력제어, 핀틀 형상 및 작동압력에 따른 유동특성 분석을 수행하였다. 이를 위해 시험에서의 유동구조와 추력계수를 비교함으로써 수치해석의 타당성을 확인하였다. 이후 각 노즐형상이 설계의도지점에 노즐목이 형성됨과 원뿔형 노즐에 대하여 핀틀 구동만으로 1:8의 추력제어가 가능함을 확인하였다. 마지막으로 고도보정 효과가 뛰어난 에어로 스파이크 노즐일지라도, 너무 낮은 NPR에 맞춰 설계된 경우, 부족팽창 조건에서 불리할 가능성을 확인하였다.

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References

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