Combustion Modes and Unsteady Characteristics during the Condition Transition of a Scramjet Combustor
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Setup
2.2. Computational Setup
3. Results and Discussion
3.1. Combustion Modes
3.2. Transition Process of the Stable Combustion Mode
4. Conclusions
- (1)
- With the increase in the injection pressure drop, three combustion modes appear during the condition transition of a scramjet, namely stable combustion mode, combustion oscillation mode, and flame blowout mode. When the injection pressure drop increases during the stable combustion modes, the area of the flame and the light intensity decrease gradually, and the wall pressure decreases accordingly after the condition transition.
- (2)
- An obvious intermittent local flame extinction phenomenon can be observed downstream of the cavity near the blowout limits. This combustion oscillation mode is accompanied by alternate local extinction and reignition phenomena. With a further increase in the injection pressure drop, an obvious flame blowout phenomenon occurs during the condition transition.
- (3)
- In the stable combustion modes, the combustion intensity deceases gradually as the injection pressure decreases during the transition process. When the injection pressure drop is relatively high, the flame-stabilized mode changes during the transition process, accompanied by a change in the distribution of wall pressure.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Case No. | P1 (MPa) | P2 (MPa) | Pressure Drop (MPa) | Equivalence Ratio | Flame Structure |
---|---|---|---|---|---|
1 | 3.67 | 3.44 | 0.23 | 0.244→0.217 | stabilization |
2 | 3.67 | 3.24 | 0.43 | 0.244→0.205 | |
3 | 3.69 | 2.77 | 0.92 | 0.244→0.180 | |
4 | 3.67 | 2.32 | 1.35 | 0.244→0.160 | oscillation |
5 | 3.64 | 2.24 | 1.42 | 0.244→0.153 | blowout |
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Jia, D.; Pan, Y.; Wang, N.; Liu, C.; Yang, K. Combustion Modes and Unsteady Characteristics during the Condition Transition of a Scramjet Combustor. Energies 2021, 14, 2522. https://doi.org/10.3390/en14092522
Jia D, Pan Y, Wang N, Liu C, Yang K. Combustion Modes and Unsteady Characteristics during the Condition Transition of a Scramjet Combustor. Energies. 2021; 14(9):2522. https://doi.org/10.3390/en14092522
Chicago/Turabian StyleJia, Dongpeng, Yu Pan, Ning Wang, Chaoyang Liu, and Kai Yang. 2021. "Combustion Modes and Unsteady Characteristics during the Condition Transition of a Scramjet Combustor" Energies 14, no. 9: 2522. https://doi.org/10.3390/en14092522