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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 | = | Damk |
| 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).