| Citation: | Tang Jiayuan, Du Jingtao, Bai Yang, et al. Analysis of thermoacoustic instability characteristics in combustion chambers under variable operating conditions[J]. Journal of Aerospace Power, 2026, 42（X）：20250277 doi: 10.13224/j.cnki.jasp.20250277
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To investigate thermoacoustic instability in combustors under variable operating conditions, this study employs an integrated approach combining gas path modeling with acoustic low-order network modeling to characterize thermoacoustic mode variations. A full-engine gas path model and combustor low-order network model were developed, where real-time gas path parameters were input through dual pathways (flame dynamics and flow field perturbations) to assess their modal effects. Results demonstrate significant sensitivity of modes to equivalence ratio and combustor inlet temperature, while pressure and mass flow effects were comparatively weaker. Except for equivalence ratio variations, flow field pathway contributions to modal shifts were less pronounced than flame pathway effects. Comprehensive thermoacoustic analysis requires concurrent consideration of real-time flow field and flame parameter updates to evaluate the flame-acoustic coupling mechanism described by Rayleigh's criterion. The prediction model was validated through combustion noise measurements under off-design conditions, establishing a framework to extend thermoacoustic research from combustor design to predictive instability control in variable operational regimes.
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