Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Linear Stability Analysis for Combustion Instability in Solid Propellant Rocket

고체추진 로켓의 선형 안정성 요소에 대한 연구

  • Kim, Hakchul (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kim, Junseong (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Moon, Heejang (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Sung, Honggye (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Lee, Hunki (School of Mechanical Engineering, Yonsei University) ;
  • Ohm, Wonsuk (School of Mechanical Engineering, Yonsei University) ;
  • Lee, Dohyung (Advanced Propulsion Technology Center, Agency for Defense Development)
  • Received : 2013.06.03
  • Accepted : 2013.08.19
  • Published : 2013.10.01
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Abstract

Linear stability analysis for combustion instability within a cylindrical port of solid rocket motor has been conducted. The analysis of acoustic energy has been performed by a commercial COMSOL code to obtain the mode function associated to each acoustic mode prior to the calculation of stability alpha. An instability diagnosis based on the linear stability analysis of Culick is performed where special interests have been focused on 5 stability factors(alpha) such as pressure coupling, nozzle damping, particle damping and additionally, flow turning effect and viscous damping to take into account the flow and viscosity effect near the fuel surface. The instability decay characteristics depending on the particle size is also analyzed.

본 연구에서는 고체로켓 모터의 연소 불안정성을 예측하고 분석 할 수 있는 해석도구의 개발을 위해 음향에너지의 분석과 선형 안정성 해석을 수행하였다. 음향 해석의 경우 상용 프로그램인 COMSOL을 이용하여 단면적이 일정한 실린더 형상의 연소실 음향 해석 및 모드 해를 도출하였다. Culick에 의해 정립된 고체추진 로켓의 선형 안정성 해석에 기초하여 연소 불안정성을 진단하였으며 압력결합, 노즐감쇠, 입자감쇠의 안정성 요소(stability alpha) 외에 유동방향변환(flow turning) 요소와 점성감쇠(viscous loss) 요소를 추가하여 연료 표면 근처의 유동 및 점성효과를 포함하는 연소 불안정의 경향을 파악하였다. 또한 입자의 크기에 따른 주파수 영역별 연소 불안정 감쇠 특성을 파악하였다.

Keywords

References

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