Effect of Particle Size Distribution on the Sensitivity of Combustion Instability for Solid Rocket Motors

입자 크기 분포도를 고려한 고체로켓 모터의 연소 불안정 민감도 예측

  • Joo, Seongmin (Graduate School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kim, Junseong (Graduate School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Moon, Heejang (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Ohm, Wonsuk (School of Mechanical Engineering, Yonsei University) ;
  • Lee, Dohyung (Advanced Propulsion Technology Center, Agency for Defense Development)
  • Received : 2015.07.16
  • Accepted : 2015.09.14
  • Published : 2015.10.01


Prediction of combustion instability within a solid-propellant rocket motor has been conducted with the classical acoustic analysis. The effect of particle size distribution on the instability has been analyzed by comparing the log-normal distribution to the fixed mono-sized particle followed by a survey of motor length scale effect between the baseline model and small scale model. Particle damping effect was more efficient for the small scale motor which has a relatively high unstable mode frequencies. It was also revealed that the prediction results by considering the particle size distribution show an overall attenuation of fluctuating pressure amplitude with respect to the mono-sized case.

본 논문에서는 음향 불안정 해석 기법을 이용하여 알루미늄 입자가 내포된 고체로켓 모터의 연소 불안정 현상을 예측하였다. 특히, 알루미늄 입자들의 로그정규분포 대비 단일 크기의 입자 분포가 연소 불안정 감쇠에 미치는 영향을 비교하여 각각의 민감도를 분석하였으며 고체로켓 모터의 길이 스케일 변화에 따른 음향 감쇠 효과를 단일 입자 크기를 가정한 경우와 비교하였다. 입자에 의한 감쇠는 불안정 모드 주파수 대역이 상대적으로 고주파인 작은 스케일 모터에서 효과적이었으며, 실제 포집장치를 통해 도출된 입자 크기 분포도를 고려한 연소 불안정 예측이 단일 입자 크기로 가정한 예측 결과보다 큰 불안정 감쇠를 보였다.



Supported by : 국방과학연구소


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