Low swirl combustion (LSC) technology has the advantage of ultralow NO_x emissions, which is of great significance to the development of low-emission gas turbine engines in the future. To investigate the flow field and flame structure characteristics of LSC, a test rig of low swirl burner was designed and developed. Particle image velocimetry measurement results show that the location and size of the recirculation zone are different, and the flow field shows typical “W”- and “U”-shaped distributions under various swirling flow conditions. The self-luminous results of LSC show that there are three flame modes including attached flame, “W”-shaped flame, and “U”-shaped flame. To deeply understand NO_x generation pathways, a chemical reactor network model was developed based on experiments and computational fluid dynamics simulations, and the effects of premixed gas components on NO_x pathways were calculated by using Chemkin software. It was verified that the NO_x production of the CH₄ mixture mixed with H₂, N₂, and CO₂ was mainly formed by the thermal NO pathway in the recirculation zone. The increase of H₂ promotes the generation of NNH-type NO_x in the main flame zone and inhibits prompt NO_x. The addition of N₂ and CO₂ greatly promotes the generation of prompt NO_x and at the same time inhibits NNH-type NO_x. In addition, there is little prompt NO_x formation in the post-flame zone.

低旋流燃烧（LSC）技术，具有超低NO的优势_X排放量，这是对低排放燃气涡轮发动机的未来发展具有重要意义。为了研究LSC的流场和火焰结构特征，设计并开发了一种低旋流燃烧器的试验台。颗粒图像测速仪的测量结果表明，回流区的位置和大小不同，流场在各种旋流条件下均表现出典型的“ W”形和“ U”形分布。LSC的自发光结果表明存在三种火焰模式，包括附着火焰，“ W”形火焰和“ U”形火焰。要深刻领会NO _X生成途径，基于实验和计算流体动力学模拟，开发了化学反应器网络模型，并使用Chemkin软件计算了预混合气体组分对NO _x途径的影响。证实了与H ₂，N ₂和CO ₂混合的CH ₄混合物的NO _x产生主要是由再循环区中的热NO途径形成的。H的增加₂促进NO NNH型的产生_X在主火焰区和抑制提示NO _X。N ₂和CO _2的添加大大促进了即时NO _x的生成，同时抑制了NNH型NO _x。另外，在火焰后区域几乎没有及时形成NO _x。