パイロット火炎及び保炎器により安定化された乱流予混合火炎の数値シミュレーション

概要

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A numerical simulation of a turbulent premixed flame stabilized by a pilot flame and bluff body was performed using the LES turbulent model and a new turbulent combustion model. In the previous work, the authors evaluated a local quenching effect due to a flame stretch and proposed a new combustion model including turbulent effects. The model also includes the temperature effect of unburned gas and the pressure effect in a combustor. First, the flame propagation to the premixed gas from the pilot flame was estimated. Due to the strong velocity gradient through the boundary layer between the premixed gas and the pilot flame, local quenching occurred around the top of the boundary layer. Thus, the ignition point of the premixed gas was located below the boundary region, where the velocity gradient was decreased. Next, the stable premixed flame after the flame propagation was estimated. Due to the strong organized motion created by the bluff body and the boundary layer between the premixed gas and the pilot flame, we could see fluctuations of the premixed flame. Further more, the distributions of the time averaged temperature and the intensity of the temperature fluctuation were compared with the experiment data. The calculated results were in good agreement with the experimental ones.
一般社団法人日本機械学会の論文
1997-11-25