Sodium line-reversal temperature profile

Temperature Measurements. Sodium line reversal temperature profile measurements were made on the flame series with varying additions of H2S. Results for H2/O2/N2 (3/1/4,5,6) are shown in Figure 3. The increase in temperature with distance above the burner is due to the slow recombination of the radicals H and OH. In the stoichiometric flames the temperature reaches a plateau in a few centimeters above the burner. In the richer flames the temperature gradient is steeper indicating a larger departure of the radical concentration from equilibrium values. The equilibrium temperatures decrease with H2S addition. However, the presence of sulfur compounds enhances radical recombination (6,11) producing almost equivalent temperature profiles, independent of H2S addition. 

Figure 3. Sodium line reversal temperature profiles above the burner surface in...

The present work involves measurement of k in a 0.1 atmosphere, stoichiometric CH -Air flame. All experiments were conducted using 3 inch diameter water-cooled sintered copper burners. Data obtained in our study include (a) temperature profiles obtained by coated miniature thermocouples calibrated by sodium line reversal, (b) NO and composition profiles obtained using molecular beam sampling mass spectrometry and microprobe sampling with chemiluminescent analysis and (c) OH profiles obtained by absorption spectroscopy using an OH resonance lamp. Several flame studies (4) have demonstrated the applicability of partial equilibrium in the post reaction zone of low pressure flames and therefore the (OH) profile can be used to obtain the (0) profile with high accuracy. 

Flame temperature profiles against distance from the burner are based on sodium line reversal measurements of Bonne and Wagner... 

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