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9 - Internal Flame Processes

Published online by Cambridge University Press:  27 October 2021

Tim C. Lieuwen
Tim C. Lieuwen
Affiliation:
Georgia Institute of Technology
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Summary

Chapter 8 considered ignition, and the processes associated with autoignition and forced ignition of a nonreactive mixture. In this chapter we focus on premixed and nonpremixed flames and the key physics controlling burning rates and extinction processes. Section 9.1 summarizes basic issues associated with the structure and burning rate of steady, premixed flames in homogeneous, one-dimensional flow fields. This includes discussions of the effects of pressure, temperature, and stoichiometry on burning rates. Section 9.2 then discusses how these results are modified by inhomogeneities in mixture composition, and the competition between autoignition waves and deflagration waves. Section 9.3 discusses how these one-dimensional characteristics are altered by inhomogeneities in the flow field relative to the flame, referred to as flame stretch. We then discuss how these lead to changes in burning rate and, for large enough levels of stretch, cause the flame to extinguish. Section 9.4 treats the effects of unsteadiness in pressure, fuel/air ratio, and stretch rate. Specifically, we discuss how the flame acts as a low-pass filter to disturbances in most cases, and that its sensitivity to disturbances diminishes with increasing frequency. These results have important implications for many combustion instability phenomena, where the flame is perturbed by time-varying flow and composition variations.

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Unsteady Combustor Physics , pp. 321 - 378
Publisher: Cambridge University Press
Print publication year: 2021

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  • Internal Flame Processes
  • Tim C. Lieuwen, Georgia Institute of Technology
  • Book: Unsteady Combustor Physics
  • Online publication: 27 October 2021
  • Chapter DOI: https://doi.org/10.1017/9781108889001.010
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  • Internal Flame Processes
  • Tim C. Lieuwen, Georgia Institute of Technology
  • Book: Unsteady Combustor Physics
  • Online publication: 27 October 2021
  • Chapter DOI: https://doi.org/10.1017/9781108889001.010
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  • Internal Flame Processes
  • Tim C. Lieuwen, Georgia Institute of Technology
  • Book: Unsteady Combustor Physics
  • Online publication: 27 October 2021
  • Chapter DOI: https://doi.org/10.1017/9781108889001.010
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