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Research Article

Numerical Research of Flame Propagation Process in a Supersonic Combustor with Multi-Strut

, , , , &
Received 11 Nov 2023, Accepted 07 Jun 2024, Published online: 19 Jun 2024
 

ABSTRACT

The flame processes and the influence of different factors on the cross flame propagation width in a supersonic combustor equipped with multi-strut fueled with kerosene were analyzed to deepen the understanding of supersonic flame characteristics. Under the conditions of Tt = 1680K, Pt = 1.64Mpa, and Ma = 2.7, the numerical calculations using the multi-step combustion reaction mechanism were carried out. The mixing performance and flame propagation width could be improved by increasing the number of struts. In the multi-strut injection method, the cross flame was observed outside the central flame. The mechanism of cross flame formation was revealed. The establishment of the cross flame had a maximum spacing requirement between injection struts, but this limit could be expanded by the high temperature zone formed by the narrow-distance injection strut. The effects of igniter energy and ignition strut equivalence ratio on the flame diffusion process were studied. Then the boundary conditions required for the cross flame propagation were obtained. The results of this study are highly significant for enhancing the performance of large-scale supersonic combustors in the future.

Nomenclature

Pt=

Total pressure

P0=

Static pressure of combustor inlet

Tt=

Total temperature

T=

Static temperature

Ma=

Mach number

ηc=

Combustion efficiency

ηc-r=

Relative combustion efficiency

Pig=

Igniter energy

ER=

Equivalence ratio

ERfst=

Mixed fractional equivalence ratio

Da=

Damko..hler number

Ws=

Distance between the injection strut and the symmetry plane

wf=

Flame propagation width

wc=

Cross flame propagation width

ηDE=

The fluid mass fraction in the specified ERfst and Da range

Abbreviations=
GCI=

Grid convergence index

Fuelf=

Fuel injected by the front injection strut

Acknowledgements

This research work is supported by the National Natural Science Foundation of China (Grants No. 12102110).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the National Natural Science Foundation of China [12102110].

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