低旋流配置下氨-甲烷-空气预混旋流火焰稳定性和排放特性

A combination of experiments and numerical simulations was employed to investigate the effects of low swirl configurations on the flame stability limits and emissions of ammonia-methane-air premixed swirling flames. The results indicated that high pollutant emissions were observed under all conditions in high swirl combustion, particularly unburned ammonia, carbon monoxide, and nitrogen oxides. In contrast, the low swirl configuration effectively reduced these pollutant emissions with only slightly narrowing the stability limits. However, ammonia-methane-air flames under low-swirl configurations produced higher levels of nitrous oxide (N_2O), which can be attributed to the lower flame temperature that inhibited the thermal decomposition of N_2O. When the non-swirling flows were further increased, the stability limits became very narrow, even though emissions were further reduced. Overall, the low-swirl configuration achieves an optimal balance between pollutant emissions and flame stability, making it suitable for combustion applications requiring reduced pollutant emissions. In general, the low swirl configuration can achieve an optimal balance between pollutant emissions and flame stability, and is suitable for combustion application scenarios that require reducing pollutant emissions.