Combustion Dynamics and Instability Analysis

Combustion dynamics investigates the coupling between unsteady heat release and pressure waves in reactive systems, encompassing gas turbines, industrial burners and propulsion devices. When fluctuations in heat release resonate with acoustic modes, they can drive self-excited oscillations and nonlinear phenomena such as limit cycles, quasiperiodicity or chaos. Such instabilities degrade efficiency, elevate emissions and risk structural damage. Research strategies combine high-fidelity simulations, low-order network models, flame describing functions and laboratory experiments to predict stability boundaries, understand mode selection and devise suppression techniques. The advent of alternative fuels—hydrogen, ammonia and bio-derived blends—has introduced new instability mechanisms owing to altered flame speeds, thermal diffusivities and reaction rates. Across the community, emphasis has shifted towards real-time sensing, adaptive control and novel combustor geometries to ensure stable, low-pollutant operation in next-generation low-carbon power and propulsion systems.

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Combustion Dynamics and Instability Analysis publication trend

The graph below shows the total number of articles in combustion dynamics and instability analysis across all publications each year (not limited to Nature Index journals).

Technical terms

Thermoacoustic instability: A feedback process where unsteady heat release amplifies acoustic waves, leading to sustained pressure oscillations.

Limit cycle oscillation: A stable, periodic oscillation in a nonlinear system arising from balance between energy input and dissipation.

Flame Describing Function: A frequency-dependent characterisation of a flame’s heat release response to imposed acoustic velocity fluctuations.

Lean premixed combustion: A combustion regime in which fuel and oxidiser are mixed before ignition, operating with excess air (equivalence ratio < 1).

Equivalence ratio: The ratio of actual fuel–air mixture to the stoichiometric mixture, indicating lean (<1) or rich (>1) operation.

References

1. Experimental study on effects of ammonia enrichment on the thermoacoustic instability of lean premixed swirling methane flames. Fuel (2024).
2. Prediction of combustion instability limit cycle oscillations by combining flame describing function simulations with a thermoacoustic network model. Combustion and Flame (2015).
3. Thermoacoustic Instability Considerations for High Hydrogen Combustion in Lean Premixed Gas Turbine Combustors: A Review. Hydrogen (2021).