Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Modeling of high energy laser heating and ignition of high explosives

고출력 레이저에 의한 가열과 폭약의 점화 모델링

  • 이경철 (서울대학교 기계항공공학부) ;
  • 김기홍 (서울대학교 기계항공공학부) ;
  • 여재익 (서울대학교 기계항공공학부)
  • Published : 2008.06.30
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Abstract

We present a model for simulating high energy laser heating of metal for ignition of energetic materials. The model considers effect of ablation of steel plate with long laser pulses and continuous lasers of several kilowatts and the thermal response of well-characterized high explosives for ignition. Since there is enough time for the thermal wave to propagate into the target and to create a region of hot spot in the high explosives, electron thermal diffusion of ultra-short (femto- and pico-second) lasing is ignored; instead, heat diffusion of absorbed laser energy in the solid target is modeled with thermal decomposition kinetic models of high explosives. Numerically simulated pulsed-laser heating of solid target and thermal explosion of RDX, TATB, and HMX are compared to experimental results. The experimental and numerical results are in good agreement.

본 연구에서는 고출력 레이저에 의한 고에너지 물질의 점화 현상 모델을 제시하였다. 본 모델에서는 강판에 긴 조사 시간을 가진 펄스 레이저를 조사하여 발생한 어블레이션에 의한 열 확산을 고려하였고, 수 kW의 continuous 레이저를 폭약에 조사하여 폭약이 열에 의하여 점화하는 현상을 실험 결과와 비교를 통해 검증하였다. 여기서는 매우 짧은 조사 시간(femto- 혹은 pico-second)을 가진 펄스 레이저에서 나타나는 전자에 의한 효과는 무시 되었다. 본 연구에 사용된 폭약은 RDX, TATB 그리고 HMX이며, 제시한 모델은 실험 결과와 흡사한 결과를 도출하였다.

Keywords

References

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