Combustion instability has become an obstacle to the development of modern gas turbines. In this study, four categories of jet tubes inject CO₂-Ar mixture to the flame root at different total injection volume flow rates and mixing ratios. These jets do not change the dominant combustion instability frequency, yet the large flow rate jets can significantly weaken the pressure and the heat addition oscillations. The tube type or the CO₂-Ar volume fraction in the jets has no apparent influence on the control efficacy. When the total jet volume flowrate reaches 10 L/min, the maximum amplitude reduction ratio of pulsating pressure and CH∗ chemiluminescence intensity is 90% and 89%, respectively. Meanwhile, the jets caused a significant drop in the flame temperature, and the NOx emission was reduced by at least 35%. However, the side effect of the jets is that the flame is on the verge of blowing out, and the CO emission increases sharply. The higher the volume fraction of CO₂ in the jets, the more likely it is to generate CO. Designers need to compromise the impact of jets on the safety and cleanliness of the combustors.

燃烧不稳定性已成为现代燃气轮机发展的障碍。在这项研究中，四类喷射管以不同的总喷射体积流量和混合比将 CO ₂ -Ar 混合物喷射到火焰根部。这些射流不会改变主要的燃烧不稳定频率，但大流量射流可以显着削弱压力和热量添加振荡。管式或 CO ₂-射流中的Ar体积分数对控制功效没有明显影响。当总射流体积流量达到10 L/min时，脉动压力和CH*化学发光强度的最大振幅降低率分别为90%和89%。同时，射流使火焰温度显着下降，氮氧化物排放量减少了至少 35%。然而，射流的副作用是火焰即将吹灭，二氧化碳排放量急剧增加。射流中 CO ₂的体积分数越高，产生 CO 的可能性就越大。设计人员需要权衡射流对燃烧室安全性和清洁度的影响。