Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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A Numerical Study on Performance Characteristics of STED with various Pressure Ratios and Cone Shapes using Burnt Gas Properties

연소가스 물성을 이용한 이차목 디퓨저의 압력비와 램 구조물 형상에 따른 성능 특성에 대한 수치적 연구

  • Yu, Seongha (School of Mechanical Engineering, Chungnam National University) ;
  • Jo, Seonghwi (School of Mechanical Engineering, Chungnam National University) ;
  • Kim, Hongjip (School of Mechanical Engineering, Chungnam National University) ;
  • Ko, Youngsung (School of Aerospace Engineering, Chungnam National University) ;
  • Na, Jaejeong (The 4th R&D Institute - 5th Directorate, Agency for Defense Development)
  • Received : 2017.11.14
  • Accepted : 2018.04.23
  • Published : 2018.10.01
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Abstract

A numerical study was conducted to investigate the performance characteristics of a STED with various pressure ratios (PRs) and cone shapes. Due to momentum loss, the pressure in vacuum chamber increased with cone angle for a PR of 75. Also, the STED is started between PRs of 36 and 37 in the case of a cone angle of $15^{\circ}$ and a blockage ratio (BR) of 15%. The results for various PRs and cone shapes are presented, and the optimal cone shape is found to have a cone angle of between $5{\sim}20^{\circ}$ and a BR of between 15~40%.

연소가스를 이용하여 압력비와 램 구조물의 형상에 따른 이차목 디퓨저의 성능 특성에 대한 수치적 연구를 수행하였다. 작동 조건인 압력비 75에서 램 구조물의 각도가 커짐에 따라 유동의 모멘텀 감소로 인해 진공실 압력이 상승하였다. 또한, 램 구조물의 반각 $15^{\circ}$, 폐색율 15%일 때, 디퓨저는 압력비 36과 37 사이에서 시동되었다. 이를 토대로 다양한 압력비와 램 구조물 형상에 따른 최적의 램 구조물 형상은 반각 $5{\sim}20^{\circ}$, 폐색율 15~40%로 판단된다.

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References

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