| Citation: | WEI Wei，XU Quanhong，SU Tong，et al.Effects of acoustic exon the dynamics of centrically⁃staged swirling stratified flames under different air split ratios［J］.Journal of Aerospace Power，2022，37（8）：1607‑1619. doi: 10.13224/j.cnki.jasp.20210573
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Macrostructures and dynamic characteristics of concentrically‑staged swirling stratified flames under multiple excitation frequencies were studied using high⁃speed CH* chemiluminescence and proper orthogonal decomposition （POD）.Results showed that the flame expanded radially with more pronounced stratification as air split ratio increased,whereas the excitation frequency played an insignificant role.POD analysis revealed that among the conducted external excitation cases,the most intense flame oscillations were observed at the excitation frequency of 200 Hz.With the increase of main stage air allocation,the heat release oscillation decreased along the axial direction.On the radial direction,however,local minima and maxima were alternately observed with stronger oscillations.
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