| Citation: | LIU Yunfeng, HUANG Yong, WANG Xiwei, et al. Large eddy simulation on influence of swirler structure on ignition performance[J]. Journal of Aerospace Power, 2022, 37（10）：2286-2294 doi: 10.13224/j.cnki.jasp.20220233
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To investigate the influences of swirler structures on the ignition performance of aero-engine combustors, the large eddy simulation combined with the wall-adapting local eddy-viscosity （WALE） sub-grid model, the dynamic thickened flame model, and a single spark was used to simulate the ignition processes of an axial-radial swirler combustor and a dual-axial swirler combustor. Results indicated that the flow fields at the ignition position changed over time due to the turbulent fluctuation under the same structures and conditions, so the ignition time affected the simulation result. To avoid the use of a single spark in simulations against the ignition results on the condition that the combustor can be ignited successfully in experiments, the spark should be started when the instantaneous velocity pointed to the recirculation zone and the velocity magnitude was smaller than the average value. Comparing the dynamic evolution process of the flow field of the axial-radial swirler combustor with the dual-radial swirler combustor, it was found that the ignition position of the dual-axial swirler combustor was directly opposite to the swirler jet, and the probability of the velocity pointing towards the recirculation zone was lower. The flame was prone to propagate downstream rather than to the recirculation zone. Therefore, the ignition performance of the double-axial swirler combustor was worse than the axial-radial swirler combustor.
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