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Attenuation behavior of thermoacoustic combustion instability analyzed by a complex-network- and
Shogo Murayama1, Hiroshi Gotoda1
1Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
Physical Review. E
|June 20, 2019
Summary
Thermoacoustic combustion instability is suppressed by an air jet, which disrupts synchronized network states. This synchronization index effectively measures the reduced coupling between pressure and heat release fluctuations.
Area of Science:
- Combustion dynamics
- Complex network theory
- Fluid dynamics
Background:
- Thermoacoustic combustion instability is a critical phenomenon in combustion systems.
- Understanding instability suppression mechanisms is vital for safe and efficient combustion.
- Complex network and synchronization concepts offer novel perspectives on dynamic systems.
Purpose of the Study:
- To experimentally investigate the attenuation of thermoacoustic combustion instability.
- To analyze instability suppression using complex network and synchronization viewpoints.
- To establish a link between network synchronization and combustion instability control.
Main Methods:
- Experimental study of combustion instability.
- Application of complex network analysis to experimental data.
- Measurement of spatiotemporal synchronization near the injector rim.
- Correlation of synchronization index with pressure and heat release rate fluctuations.
Main Results:
- A steady air jet degenerates spatiotemporal phase-synchronization in weighted networks near the injector rim.
- The synchronization index quantifies the attenuation of mutual coupling between pressure and heat release rate fluctuations.
- Reduced periodicity in flow velocity oscillations significantly impacts mutual coupling, leading to instability suppression.
Conclusions:
- Network synchronization analysis provides a robust method for characterizing thermoacoustic combustion instability.
- Suppression of instability is linked to the disruption of synchronized states in the combustion system.
- The findings offer insights into controlling combustion instabilities through flow manipulation and network dynamics.
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