Experimental Study of Flame Dynamics in a Triple-Injector Swirling Nonpremixed Combustor Under Different Thermoacoustic Self-Excited Instability Modes
Xiang Zhang, Suofang Wang, Yong Liu
TL;DR
This study explores how flame behavior changes under different types of combustion instability in a specialized engine setup, aiming to improve engine design.
Contribution
The study reveals nonlinear flame dynamics and distinct heat release patterns under various thermoacoustic instability modes in a triple-nozzle combustor.
Findings
Lower frequency instability modes are driven by fluctuations in flame length.
High-frequency modes are dominated by flame surface wrinkles and convective processes.
Higher frequencies show simultaneous patterns of flame length and surface fluctuations.
Abstract
Combustion instability is one of the prominent and unavoidable problems in the design of high-performance propulsion systems. This study investigates the heat release rate (HRR) responses in a triple-nozzle swirling nonpremixed combustor under various thermoacoustic self-excited instability modes. Dynamic pressure sensors and high-speed imaging were employed to capture the pressure oscillations within the combustion chamber and the characteristics of flame dynamics, respectively. The results reveal nonlinear bifurcations in the self-excited thermoacoustic instabilities at different equivalence ratios. Significant differences in flame dynamics were observed across the instability modes. In lower frequency modes, the fluctuations in flame length contribute to the driving force of thermoacoustic instability. In relatively high-frequency modes, HRR fluctuations are dominated by the rolling…
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Taxonomy
TopicsCombustion and flame dynamics · Advanced Combustion Engine Technologies · Radiative Heat Transfer Studies