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Effect of radiation models on the suppression limits in counterflow CH /air diffusion flame was numerically investigated with fundamental experiments for the numerical validation. N and CO were considered as extinguishing agents. The differences in extinguishing concentration between OTM and SNB radiation models which have different accuracy levels were examined. As a result, there is no considerable difference in extinguishing concentration for the N dilution as the radiation models with different accuracy levels were used. As the CO having strong radiative effect was diluted in the low strain flames, however, the radiation model with high predictive accuracy such as SNB should be used. In particular, the CO dilution in fuel stream leads to the significant difference in extinguishing concentration between OTM and SNB models. Therefore, it is necessary that the radiation model should be reasonably chosen with the consideration of numerical accuracy and computational time for the prediction of extinguishing concentration.

Effect of Radiation Models on the Suppression Limits in Counterflow Methane/Air Diffusion Flames