Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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A CFD Study on the Combustion Pressure Oscillation by a Location of a Pressure Transducer inside Closed Vessel

밀폐용기 연소실험 시 센서위치에 따라 변화하는 압력 진동에 대한 수치적 연구

  • Han, Doo-hee (School of Mechanical and Aerospace Engineering, Korea Aerospace University) ;
  • Ahn, Gil-hwan (Energetic Materials & Pyrotechnics Department, Hanwha Corporation R&D Institute) ;
  • Ryu, Byung-tae (Agency for Defense Development) ;
  • Sung, Hong-gye (School of Mechanical and Aerospace Engineering, Korea Aerospace University)
  • Received : 2017.03.23
  • Accepted : 2017.08.06
  • Published : 2018.04.01
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Abstract

A computational fluid dynamics simulation of pyrotechnic material combustion inside a cylindrical closed vessel was carried out using the Eulerian-Lagrangian method. The 5th order upwind WENO scheme and the improved delayed detached eddy turbulence model were implemented to capture shock waves. The flow structure was analyzed inside the cylindrical vessel with a pressure sensor installed at the side wall center. The analysis revealed that the pressure oscillated because of the shock wave vibration. Additionally, the simulation results with four different sensor tab depths implied that, inside the sensor tab, eddies were generated by the excessively large gap between the sensor diaphragm and the side wall. These eddies caused irregularity to the measured time-pressure curve, which is an undesirable characteristic.

밀폐용기 내 Zirconium/Potassium Perchlorate의 연소를 수치적 모델링을 통해 전산해석을 수행하였다. 5차 WENO 공간차분법과 improved delayed detached eddy (IDDES) 난류모델을 사용하여 충격파가 동반되는 내부 유동구조를 모사하였고, 라그랑지안 연소모델을 통해 화약 입자를 계산하였다. 옆면 중앙에 센서가 설치된 원통형 밀폐용기 내부 유동분석을 통해 압력 진동이 발생하는 원인을 규명하였다. 또한 센서 다이어프램 깊이 변화에 따라 측정되는 압력 데이터를 실험값과 비교분석 하였다. 그 결과 센서 탭의 깊이가 약 2.36 mm 이상으로 커지면 유동속도가 아음속으로 감쇠하고 복잡한 eddy가 발생하여 측정값에 큰 불규칙성을 야기하는 현상을 관측하였다.

Keywords

References

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