Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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LES Investigation of Pressure Oscillation in Solid Rocket Motor by an Inhibitor

고체모터의 인히비터에 의한 압력 진동 특성 LES 연구

  • 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)
  • Received : 2013.11.13
  • Accepted : 2014.12.06
  • Published : 2015.02.01
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Abstract

The pressure oscillation induced by inhibitor in a solid rocket motor has been investigated by 3D large eddy simulation(LES) and proper orthogonal decomposition(POD). The vortex generation and breakdown at inhibitor are periodically observed between the inhibitor and the nozzle by flow-acoustic coupling mechanism. The excitation of pressure oscillation occurs as the flow impinges on the submerged nozzle head which recirculate in the cavity in rear dome of the motor chamber. The vortex generation frequency is closely related with the shedding frequencies of the detached vorticities at the inhibiter, which fairly compared with the experimental data.

3차원 Large Eddy Simulation(LES)와 Proper Orthogonal Decomposition(POD) 기법을 이용하여 고체로켓의 인히비터에서 발생하는 연소실내 압력 진동 특성을 분석하였다. 인히비터 후방에서 발생한 와류는 Flow-acoustic coupling에 의해 주기적으로 반복하여 생성, 소멸이 이루어지는 것을 확인하였고, 이 와류가 내삽 노즐 입구 도출부에 충돌하면서 유동이 불균질하게 분해되고, 후방 돔으로 유입된 유동에 의한 압력 진동은 연소실 압력 진동 가진의 원인이 된다. 또한 인히비터에서 발생하는 와흘림(vortex shedding) 주기는 연소실내 와류 발생 주기와 일치하며, 실험에서 측정된 압력 진동 주파수와 비교 분석하였다.

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References

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