Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel
Abstract
:1. Introduction
2. Experimental and Computational Specifications
2.1. Experimental Setups and Procedure
2.2. Laminar Burning Velocity
2.3. Thermal Expansion Ratio and Flame Thickness
2.4. Lewis Number
3. Results and Discussion
3.1. System Validation and Laminar Burning Velocity
3.2. Flame Morphology
3.3. Critical Flame Radius and Critical Peclet Number
4. Conclusions
- (1)
- When hydrogen fractions are above 50%, the flame tends to be more stable as the equivalence ratio increases; however, the instability increases for flames of lower hydrogen fractions.
- (2)
- For the premixed syngas flames with hydrogen fractions lower than 50%, the effects of equivalence ratio on the variation in the Lewis number can be neglected. With the increase in equivalence ratio, the cellular instabilities become more evident because the enhanced hydrodynamic instabilities become the dominant effect.
- (3)
- For the premixed syngas flame with hydrogen fractions greater than 50%, the decline in cellular instabilities induced by the increase in equivalence ratio can be attributed to the reducing diffusive-thermal instabilities rather than the increasing hydrodynamic instabilities.
- (4)
- For the premixed syngas flame, the enhancement of cellular instabilities induced by the increase in hydrogen fraction is the result of both increasing diffusive-thermal and increasing hydrodynamic instabilities.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Li, H.-M.; Li, G.-X.; Sun, Z.-Y.; Zhai, Y.; Zhou, Z.-H. Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel. Energies 2014, 7, 4710-4726. https://doi.org/10.3390/en7074710
Li H-M, Li G-X, Sun Z-Y, Zhai Y, Zhou Z-H. Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel. Energies. 2014; 7(7):4710-4726. https://doi.org/10.3390/en7074710
Chicago/Turabian StyleLi, Hong-Meng, Guo-Xiu Li, Zuo-Yu Sun, Yue Zhai, and Zi-Hang Zhou. 2014. "Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel" Energies 7, no. 7: 4710-4726. https://doi.org/10.3390/en7074710