Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Effects of Additive and Preheat on the Partially Premixed $CH_4-Air$ Counter Flow Flames Considering Non-gray Gas Radiation

  • Park Won-Hee (Track & Civil Engineering Research Department, Korea Railroad Research Institute) ;
  • Chang Hee-Chul (Graduate School Chung-Ang University) ;
  • Kim Tae-Kuk (Department of Mechanical Engineering, Chung-Ang University)
  • Published : 2006.02.01
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Abstract

Detailed structures of the counterflow flames formed for different inlet fluid temperatures and different amount of additives are studied numerically. The detailed chemical reactions are modeled by using the CHEMKIN-II code. The discrete ordinates method and the narrow band based WSGGM with a gray gas regrouping technique (WSGGM-RG) are applied for modeling the radiative transfer through non-homogeneous and non-isothermal combustion gas mixtures generated by the counterflow flames. The results compared with those obtained by using the SNB model show that the WSGGM-RG is very successful in modeling the counterflow flames with non-gray gas mixture. The numerical results also show that the addition of $CO_2\;or\;H_2O$ to the oxidant lowers the peak temperature and the NO concentration in flame. But preheat of fuel or oxidant raises the flame temperature and the NO production rates. $O_2$ enrichment also causes to raise the temperature distribution and the NO production in flame. And it is found that the $O_2$ enrichment and the fuel preheat were the major parameters in affecting the flame width.

Keywords

References

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