This article experimentally studies the synchronous control of combustion instability and NO_x emission in a model gas turbine combustor. The application of tabular jet in cross flow was adopted to test the effectiveness of synchronous control. The flow rate, height, direction, and relative molecular masses were studied in this research. Results suggest that the ideal damping ratio of the sound pressure amplitude can be as high as 73.7% under the carbon dioxide jet in cross flow case. The carbon dioxide jet in cross flow case can lead to a better thermoacoustic instability suppression result than the instances of argon or helium. Besides, amplitude and frequency switching of the unsteady flame emerged during the experiment. Adding minimal inert gaseous can change the local oscillation of equivalence ratio. The suppression ratio of NO_x emission can reach as high as 44% under the carbon dioxide cases, which performs better than the argon or helium cases. Moreover, the flame length declines as the tabular jet in cross flow rate increases. When the flow rate increases (or the height decreases), the size of the flame front or root will decrease. The average flame length dropped from 122 to 41 mm. The macrostructure of the flame changes significantly under different injecting heights or directions. This article can serve as a specific guideline for the passive control of thermoacoustic instability in gas turbine, rocket, and industrial burners.

中文翻译：

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二氧化碳，氩气和氦气射流对燃烧不稳定性和NOx排放的同步控制的影响

本文通过实验研究了燃烧不稳定性和NO _x的同步控制。模型燃气轮机燃烧室中的气体排放。采用板式射流在错流中的应用来检验同步控制的有效性。在这项研究中研究了流速，高度，方向和相对分子质量。结果表明，在横流情况下，在二氧化碳射流下，声压幅值的理想阻尼比可以高达73.7％。与氩气或氦气相比，错流情况下的二氧化碳射流可以更好地抑制热声不稳定性。此外，实验过程中还出现了不稳定火焰的振幅和频率切换。添加最少的惰性气体可以改变当量比的局部振荡。NO _x的抑制率在二氧化碳的情况下，二氧化碳的排放量可高达44％，比氩气或氦气的情况更好。此外，随着板式射流横向流量的增加，火焰长度减小。当流速增加（或高度减小）时，火焰前部或根部的尺寸将减小。平均火焰长度从122毫米降至41毫米。在不同的喷射高度或方向下，火焰的宏观结构会发生显着变化。本文可以作为对燃气轮机，火箭和工业燃烧器中的热声不稳定性进行被动控制的特定指南。