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The Nonlinear Combustion Instability Prediction of Solid Rocket Motors

고체로켓모터의 비선형 연소 불안정성 예측 기법

  • Hong, Ji-Seok (Department of Mechanical and Aerospace Engineering, Korea Aerospace University) ;
  • Moon, Hee-Jang (School of Mechanical and Aerospace Engineering, Korea Aerospace University) ;
  • Sung, Hong-Gye (School of Mechanical and Aerospace Engineering, Korea Aerospace University) ;
  • Um, Won-Seok (School of Mechanical Engineering, Yonsei University) ;
  • Seo, Seonghyeon (Department of Mechanical Engineering, Hanbat National University) ;
  • Lee, Do-hyung (Advanced Propulsion Technology Center, Agency for Defense Development)
  • Received : 2015.10.21
  • Accepted : 2016.01.12
  • Published : 2016.02.01

Abstract

The prediction of combustion instability is important to avoid an obvious threat to the structural safety and the motor performance because it affects the apparent response function of the propellant, the burning rate, and a mean flow Mach number at the local surface. The combustion instability occurs in case acoustic waves were coupled with the combustion/flow dynamic frequency. In this paper, an acoustic instability model is derived from the nonlinear wave equation for analysing acoustic dynamics in solid rocket motors. The chamber pressure and burning rate effects on combustion instability have been investigated.

연소 불안정 현상은 연료의 응답 함수, 연소율, 국부 연료 표면의 유동 속도에 영향을 미치기 때문에 고체로켓 모터 설계 시 성능이나 구조적 안정성을 다루는 측면에서 매우 중요한 부분이다. 연소 불안정 현상은 음향 모드가 연소/유동과정에서 발생하는 진동수와 결합(coupled)되었을 때 발생한다. 본 연구에서는 비선형 파동방정식으로부터 음향 비선형 불안정 모델을 유도하여 실린더형 고체로켓 모터의 연소 불안정 현상을 분석하였다. 또한 고체로켓 모터 연소실 압력, 연소 속도가 연소 불안정에 미치는 영향을 조사하였다.

Keywords

References

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