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12 - Forced Response II: Heat Release Dynamics

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 11 described the dynamics of flamelets forced by velocity or burning rate oscillations and illustrated the key physics controlling the spatiotemporal dynamics of the flame position. This chapter focuses on the impacts of these disturbances on the mass burning rate and/or heat release rate itself. For example, a key quantity of interest for the thermoacoustic instability problem is the heat release fluctuations that are induced by the flame disturbances. Section 12.1 gives an overview of the basic mechanisms through which flow disturbances lead to heat release oscillations, and differentiates between velocity coupling, fuel/air ratio coupling, pressure coupling, and acceleration coupling. Section 12.2 treats the effects of the flame configuration on its sensitivity to these disturbances, such as geometry or reactant premixing.

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Unsteady Combustor Physics , pp. 463 - 510
Publisher: Cambridge University Press
Print publication year: 2021

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