| Citation: | WANG Hui, LIU Yongfeng, HU Chuanlong, et al. Large eddy simulation on the impact of low-temperature inlet on the ignition process[J]. Journal of Aerospace Power, 2026, 41（3）：20250077 doi: 10.13224/j.cnki.jasp.20250077
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The ignition reliability of lean combustion is fundamental to make sure that gas turbine combustor can operate in low-temperature environment reliably. It is important to investigate the influence of key factors on ignition process to improve ignition performance. Based on the multi-swirl staged model combustor, the effects of low-temperature inlet and fuel to air ratio on the behaviors of the initial flame kernel and flame propagation were analyzed. In this work, large eddy simulation and dynamic thickened flame model coupled with skeletal chemical reaction mechanism of kerosene were used to capture flamelet information during the ignition process. The results showed that the numerical method can capture the ignition process accurately. The axial velocity, droplet temperature and local equivalence ratio of the ignition position decreased as the inlet air temperature decreased, while the local equivalence ratio increased with the increase of fuel to air ratio. Ignition failed when inlet air temperature reduced to 253 K, as local equivalence ratio of the ignition position decreased. The ignition with low-temperature inlet air can be realized successfully by raising the fuel to air ratio to 0.04 at the same time, but the ignition delay time was extended by 26.72% and the flame propagation path was changed.
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