| Citation: | TANG Wenbin, CHEN Xiang, CAO Tingting, et al. Study on flow characteristics and flame structure characteristics of concentric annular recirculation swirl combustor[J]. Journal of Aerospace Power, 2026, 41（1）：20240185 doi: 10.13224/j.cnki.jasp.20240185
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In order to meet the requirements of the next generation combustion chamber, a concentric annular recirculation swirl combustor scheme was proposed innovatively. The numerical simulation and experimental study of the cold flow field characteristics and flame structure of the concentric annular recirculation swirl combustor were carried out. PIV was used to capture the cold flow field, and a high-speed camera equipped with a methyl filter was used to capture the flame structure image. The results showed that: (1) The concentric annular recirculation swirl combustor can form a complete annular recirculation zone connected in the circumferential direction to stabilize the flame, and the flame presented a “V” shape structure. (2) When only the pre-combustion stage nozzle was working, the strong chemical reaction zone was mainly concentrated on both sides of the flame tube wall, which expanded with the increase of the equivalence ratio and became more uniform in the circumferential direction. After the main combustion stage nozzle worked, although its equivalent ratio increased, the length of the strong chemical reaction zone increased and the width decreased. (3) When only the pre-combustion stage nozzle worked, the inner and outer flame widths increased with the increase of the equivalence ratio and the inlet air flow rate. After the main combustion stage nozzle worked, the width of the inner and outer flames dropped sharply, and then increased with the increase of the equivalence ratio. The inner and outer flame lengths increased monotonously with the increase of equivalence ratio and inlet air flow rate.
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