| Citation: | Wang Jing, Zhang Chi, Tao Wenjie, et al. Numerical Simulation of the influence of main stage swirl number on combustor NOx emissions[J]. Journal of Aerospace Power, 2026, 41（X）：20250157 doi: 10.13224/j.cnki.jasp.20250157
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To investigate the influence of main stage swirl number on NOx emissions in a centrally-staged lean premixed prevaporized combustor across wide operating conditions, three-dimensional numerical simulations were used to analyze the turbulent combustion and NO formation characteristics during the reference emissions Landing and Take-Off (LTO) cycle. And the simulation methodology was validated against experimental NOx emission data. Furthermore, the influence of main stage swirl number on NOx emissions under LTO cycle conditions was simulated and analyzed. The results revealed that the influence of main swirl number on NOx emissions varied under different operating conditions. At idle conditions, an increase in main swirl number enhanced fuel-air mixing in the pilot combustion zone, leading to higher combustion temperature and elevated NOx emissions. Under high-load conditions, as the main swirl number increased, additional airflow was entrained into the re-circulation zone, further reducing the fuel-to-air ratio in the lean primary combustion zone and thereby decreasing NOx emissions. With increasing main swirl number over the range of 0.5 to 0.9, total NOx emissions during the reference emissions landing and takeoff cycle decreased.
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