Flame dynamics and their effect on thermoacoustic instabilities

WANG Yichen; ZHU Min

doi:10.16511/j.cnki.qhdxxb.2022.25.021

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (4) : 785-793. DOI: 10.16511/j.cnki.qhdxxb.2022.25.021

Flame dynamics and their effect on thermoacoustic instabilities

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Abstract

The flame dynamics strongly affect the accurate prediction and control of self-excited oscillations in combustion systems. This paper introduces the authors' research on the theoretical modeling and experimental verification of the flame dynamics characteristics for various practical application backgrounds, including ideal non-premixed jet flames, bluff body premixed flames, main/piloted flames and flames with multi-dimensional disturbances. This review presents a distributed flame transfer function for non-premixed flames developed using the Green's function method. The interaction mechanism between the vortex and the flame surface was studied using the flame surface equation and the discrete vortex model. The interaction mechanism between the pilot flame and the main flame was studied through modeling. The response characteristics of flames to disturbances in various directions were also studied. The flame dynamics model was combined with an acoustic network model to show that the flame dynamics have different effects on the thermoacoustic modal stability.

Key words

flame dynamics / thermoacoustic oscillations / bluff-body stabilized flames / pilot flames / acoustic network model

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WANG Yichen, ZHU Min. Flame dynamics and their effect on thermoacoustic instabilities[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(4): 785-793 https://doi.org/10.16511/j.cnki.qhdxxb.2022.25.021

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