| OCR Text |
Show SUMMARY LIF measurements of free radicals in low pressure flames form important tests of our understanding of flame chemistry, as embodied in flame chemistry models. W e have made absolute concentration profiles of CH, N O , O H , and H C O to use as targets for optimization of the flame chemistry model GRI-Mech, and have utilized LIF rotational temperature measurements to provide flame temperatures. The results, for several methane/N2/02 flames of varying stoichiometry, indicate that GRI-Mech does a good job on hydrocarbon oxidation chemistry in lean and near stoichiometric flames but may have some problems in adequately describing rich flames. The current rate coefficient for the C H + N2 reaction appears to be too low. N O reburn chemistry is correctly predicted in a lean flame but seriously underpredicted in a rich flame. ACKNOWLEDGMENTS This work was supported by the Basic Research Group of the Gas Research Institute. W e thank Jorge Luque for useful discussions throughout this work, and Alison Noble and Deborah Hill for help with some of the C H data. REFERENCES 1. Frenklach, M., Wang, H., Goldenberg, M., Bowman, C. T., Hanson, R. K., Davidson, D. F., Smith, G. P., Golden, D. M., Gardiner, W . and Lissianski, V., Proceedings of the 1995 International Gas Research Conference, (Gas Research Institute, Chicago, Illinois, 1996), p. 1400. 2. http://www.me.berkeley.edu/gri_mech/ 3. Frenklach, M., Goldenberg, M., Bowman, C. T , Hanson, R. K., Davidson, D. F., Smith, G. P., Golden, D. ML, Gardiner, W., Lissianski, V., and Serauskas, R. V. Proceedings of the 1998 International Gas Research Conference, in press, 1998. 4. Heard, D. E., Jeffries, J. B., Smith, G. P. and Crosley, D. R. (1992). Comb. Flame, 88:137. 5. Luque, J., Smith, G. P. and Crosley, D. R., Proceedings of the 1995 International Gas Research Conference, (Gas Research Institute, Chicago, Illinois, 1996), p. 1567. 6. Twenty-Sixth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 1996. 7. Crosley, D. R., in "Turbulence and Molecular Processes in Combustion," T. Takeno, Ed., Elsevier, Netherlands, 1993, p. 221. 8. Miller , J. A. and Bowman, C. T. (1989). Prog. Energy Combust. Sci., 15:287. 9. Luque, J., Smith, G. P., and Crosley, D. R., Twenty-Sixth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 1996, p. 959. 10. Kee, R. J., Grcar, J. F., Smooke, M . D. and Miller, J. A. (1985). Sandia National Laboratory Report SAND85-8240. 11. Tamura, M., Berg, P., Luque, J., Jeffries, J. B., Smith, G. P., and Crosley, D. R. (1996). Comb. Flame, in press. 12. Luque, J., and Crosley, D. R. (1996). Appl. Phys. B, 63:91. 13. Berg, P. A., Hill, D. A., Noble, A. R., Smith, G. P., Jeffries, J. B. and Crosley, D. R. (1998). Comb. Flame, submitted. 14. Berg, P. A., Jeffries, J. B., Smith, G. P., Crosley, D. R. and Scherer, J. J., Western States Meeting of the Combustion Institute, Berkeley, California, March 1998. 15. Rensberger, K. J., Jeffries, J. B., Copeland, R. A., Kohse-Hoinghaus, K., Wise, M. L. and Crosley, D. R. (1989). Appl. Opt., 28:3556. 16. Berg, P. A., Jeffries, J. B., Smith, G. P. and Crosley, D. R. Twenty-Seventh Symposium (International) on Combustion, 1998, in press. 17. Jeffries, J. B., Crosley, D. R., Wysong, I. J. and Smith, G. P. Twenty-Third Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 1990, p. 1847. 10 |
