Effects of Additive and Preheat on the Partially Premixed CH4-Air Counter Flow Flames Considering Non-gray Gas Radiation

초록

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 WSGG-RG model is very successful in modeling the counterflow flames with non-gray gas mixture. The numerical results also show that the addition of CO2 or H2O 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. O2 enrichment also causes to raise the temperature distribution and the NO production in flame. And it is found that the O2 enrichment and the fuel preheat were the major parameters in affecting the flame width.

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