Turbulent combustion (Lecture 3) Non-premixed flames

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Results - non-premixed! Moving tubes at lower Da - similar to premixed flames! How can non-premixed flames exhibit premixed flame instabilities Near extinction, fuel or O 2 "leaks"through flame front, causing partial premixing of fuel and O 2 , creating quasipremixed-flame behavior! Fuel/N 2 side! Fuel/N 2 side! Air side! Air side! Normal view! AME 514 - Spring 2013 - Lecture 9 Orthogonal view! 39 Results - non-premixed! Stationary multiple or single tubes at still lower Da! Fuel/N 2 side! Fuel/N 2 side! Air side! Air side! 3 tubes! 1 tube! AME 514 - Spring 2013 - Lecture 9 40 • 20
References! Buckmaster, J. D., Combust. Sci. Tech. 115, 41 (1996). Buckmaster, J., "Edge flames," Prog. Energy Combust. Sci. 28, 435-475 (2002). Buckmaster, J. D. and Short, M. (1999). Cellular instabilities, sub-limit structures and edge-flames in premixed counterflows. Combust. Theory Modelling 3, 199-214. M. S. Cha and S. H. Chung (1996). Characteristics of lifted flames in nonpremixed turbulent confined jets. Proc. Combust. Inst. 26, 121–128 M. S. Cha and P. D. Ronney, "Propagation rates of non-premixed edge-flames, Combustion and Flame, Vol. 146, pp. 312 - 328 (2006). R. Chen, R. L. Axelbaum, Combust. Flame 142 (2005) 62–71. R. Daou, J. Daou, J. Dold (2002). "Effect of volumetric heat-loss on triple flame propagation" Proc. Combust. Inst., Vol. 29, pp. 1559 - 1564. J. Daou, A Liñán (1998). "The role of unequal diffusivities in ignition and extinction fronts in strained mixing layers," Combust. Theory Modelling 2, 449–477 J. Daou and A. Liñán (1999). "Ignition and extinction fronts in counterflowing premixed reactive gases," Combust. Flame. 118, 479-488. Hinze, J. O. (1975) "Turbulence," McGraw-Hill. Hottel, H. C., Hawthorne, W. R., Third Symposium (International) on Combustion, Combustion Institute, Pittsburgh, Williams and Wilkins, Baltimore, 1949, pp. 254-266. Joulin, G. and Clavin, P. (1979). Linear stability analysis of nonadiabatic flames: diffusionalthermal model. Combust. Flame 35, 139. Kalghatgi, G. T. (1984). Lift-Off Heights and Visible Lengths of Vertical Turbulent Jet Diffusion Flames in Still Air. Combust. Sci. Tech. 41, 17-29. AME 514 - Spring 2013 - Lecture 9 41 References! Kaiser, C., Liu, J.-B. and Ronney, P. D., "Diffusive-thermal Instability of Counterflow Flames at Low Lewis Number," Paper No. 2000-0576, 38 th AIAA Aerospace Sciences Meeting, Reno, NV, January 11-14, 2000. N. I. Kim, J. I. Seo, Y. T. Guahk and H. D. Shin (2006). "The propagation of tribrachial flames in a confined channel," Combustion and Flame, Vol. 146, pp. 168 - 179. Liu, J.-B. and Ronney, P. D., "Premixed Edge-Flames in Spatially Varying Straining Flows," Combustion Science and Technology, Vol. 144, pp. 21-46 (1999). Lyons, K. M. (2007). “Toward an understanding of the stabilization mechanisms of lifted turbulent jet flames: Experiments,” Progress in Energy and Combustion Science, Vol 33, pp. 211–231 Pitts, W. M. (1988). “Assessment of theories for the behavior and blowout of lifted turbulent jet diffusion flames,” 22 nd Symposium (International) on Combustion, pp. 809–16. Ruetsch, G. R., Vervisch, L. and Linan, A. (1995). Effects of heat release on triple flames. Physics of Fluids 7, 1447. Shay, M. L. and Ronney, P. D., "Nonpremixed Flames in Spatially-Varying Straining Flows," Combustion and Flame, Vol. 112, pp. 171-180 (1998). Sivashinsky, G. I., Law, C. K. and Joulin, G. (1982). On stability of premixed flames in stagnationpoint flow. Combustion Science and Technology 28, 155-159. R. W. Thatcher and J. W. Dold (2000). "Edges of flames that do not exist: flame-edge dynamics in a non-premixed counterflow." Combust. Theory Modelling 4, 435-457. Vedarajan, T. G., Buckmaster, J. D. and Ronney, P. D., "Two-dimensional Failure Waves and Ignition Fronts in Premixed Combustion," Twenty-Seventh International Symposium on Combustion, Combustion Institute, Pittsburgh, 1998, pp. 537-544. AME 514 - Spring 2013 - Lecture 9 42 • 21
Page 1 and 2: Turbulent combustion (Lecture 3)!
Page 3 and 4: Scaling of turbulent jets! ! ! Hin
Page 5 and 6: Liftoff of turbulent jets! Similar
Page 7 and 8: Edge flames - nonpremixed - theory!
Page 9 and 10: Edge flames - nonpremixed - with he
Page 11 and 12: Edge flames - nonpremixed - experim
Page 13 and 14: Edge flames - nonpremixed - experim
Page 15 and 16: Edge flames with low Lewis number !
Page 17 and 18: Schematic of tube formation! Combus
Page 19: Results - non-premixed! AME 514 - S

Turbulent combustion (Lecture 3) Non-premixed flames

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