Combustion Modeling of Nano/Micro Aluminum Particle Mixture

나노-마이크로 알루미늄 혼합 입자의 공기와의 연소 모델링

  • 윤시경 (포스코 기술연구원 제선FINEX 연구그룹) ;
  • 신준수 (한국항공대학교 항공우주 및 기계공학부) ;
  • 성홍계 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2011.07.20
  • Accepted : 2011.12.10
  • Published : 2011.12.30

Abstract

One dimensional combustion modeling of aluminum combustion behavior is proposed. Combustion model is assumed that region consists as follows ; preheat, reaction, post reaction region. Flame speed as a function of particle size, equivalence ratio for unitary particles and fraction ratio of micro to nano particle size for binary particles were investigated for lean burn condition at 1 atm. Results were compared with experimental data. For unitary particles, flame speed increase as particle size decreases, but opposite trend with equivalence ratio. For binary particles, flame speed increases proportionally as nano particle fraction increases. For flame structure, separated or overlapping flames are observed, depending on the fraction of nano sized particles.

금속 연료 중 널리 사용되는 알루미늄의 연소 특성에 관하여 1차원 연소모델링을 제안하였다. 연소 모델링은 예열영역, 반응영역, 반응 후 영역, 세 영역으로 나누어 수행하였다. 또한 희박연소로 가정하여 단일 입자의 경우 입자크기와 당량비에 따른 화염속도, 나노와 마이크로 입자의 혼합물의 경우 혼합 비율에 따른 화염속도를 압력이 1기압 조건에서 계산하여 실험결과와 비교하였다. 단일입자의 경우, 입자의 크기가 작아질수록 화염속도가 빨라지고, 당량비가 낮아질수록 화염속도가 느려지는 현상이 관찰되었다. 나노와 마이크로 입자의 혼합물의 경우, 나노 입자의 함유량에 따라 화염속도는 빨라지며, 화염구조는 분리화염과 중첩화염이 나타남이 관찰되었다.

Keywords

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