纯氢预混阵列微管燃烧器振荡被动控制研究

The use of hydrogen fuel is the key technology for gas turbines to achieve low carbon or even zero carbon emissions. Micro-mixing combustion technology is the most practical and feasible method to prevent flashback and NO _x reduction. The pure hydrogen premixed micro-tube arrayed model burner AC01 can achieve stable combustion with low emissions， but there are serious combustion oscillations in some conditions. The oscillation characteristics of the above burner are studied by adjusting the length of the micro-tube， adjusting the number of long micro-tubes， and adjusting the array pattern of long micro-tubes. The results show that when the perforated flame liner is used， the AC01 burner starts to oscillate above 0.55 equivalent ratio（defined as φ）. When the 25% or 50% （4 or 8） of the micro-tubes are lengthened by 6 mm， the oscillation can be completely suppressed between 0.3~0.8 equivalent ratio with 0.3% pressure drop（the differential pressure from micro-tubes inlet to atmospheric/atmospheric pressure）. All kinds of arrangement patterns have excellent oscillation suppression effect. When the imperforated flame line is used， the combustion oscillation is intensified， with amplitude of more than 200 Pa and frequency of about 1 000 Hz. When the micro-tube is extended by 12 mm， the oscillation can be suppressed. This indicates that the selection of the extended length of the micro-tube is related to the oscillation frequency.