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단일액적연소현상에서 비회색체복사에 관한 연구

Investigation of a droplet combustion with nongray gas radiation effects

  • 최창은 (한국과학기술원 항공우주공학과 대학원) ;
  • 박재현 (한국과학기술원 항공우주공학과 대학원) ;
  • 박승욱 (한국과학기술원 항공우주공학과 대학원)
  • 발행 : 1997.10.01

초록

Single liquid droplet combustion processes including heating, evaporation, droplet burning and flame radiation were theoretically investigated by adopting nongray gas radiation model for the radiative transfer equation (RTE). n-Heptane was chosen as a fuel and the numerical results were compared with the experimental data available in the literature. The discrete ordinate method (DOM) was employed to solve the radiative transfer equation and the weighted sum of gray gases model (WSGGM) was applied to account for nongray effect by CO$_{2}$, and H$_{2}$0. Therefore, detailed effects by nongray gas and its comparison with the gray gas model could be figured out in the results. It is found that the radiative heat flux is higher when the nongray model is used, thereby reducing the maximum gas temperature and the flame thickness, but the total burning time increases due to the deceased conductive heat flux in nongray model. Consequently, a better agreement with experimental data could be obtained by using nongray model.

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