Secondary fuel injection affects the combustion organization and flame dynamic in axial fuel staging gas turbines. Here, we experimentally investigate a front-fuel rear-air twin-nozzle configuration in which the fuel and air can be independently injected to stabilize a lifted flame front, control the jet trajectory and tune the combustion mode in a very flexible way. A high repetition two-line formaldehyde planar laser induced fluorescence thermometry technique is used to measure the lift-off preheat zone temperature field of the flame with different amount of secondary air injection. The combustion flow field and the flame front dynamics are investigated using particle image velocimetry and CH${}^{*}$ chemiluminescence. When the air to fuel ratio increases from 0 to 3, the preheat zone temperature, which is affected by the local equivalence ratio and injection air cooling, increases from 1300 K to 1600 K and then slightly declines. The lift-off region temperature and flow field dynamics are related to the variation of lift-off height, heat release rate and stability of the reacting jet in hot crossflow.

二次燃料喷射影响轴向燃料多级燃气轮机的燃烧组织和火焰动力学。在这里，我们通过实验研究了前置燃料后置空气双喷嘴配置，其中燃料和空气可以独立喷射以稳定升起的火焰前锋，控制射流轨迹并以非常灵活的方式调整燃烧模式。采用高重复双线甲醛平面激光诱导荧光测温技术测量不同二次空气喷射量下火焰的提离预热区温度场。使用粒子图像测速仪和 CH 研究燃烧流场和火焰前锋动力学${}^{*}$化学发光。当空燃比从0增加到3时，受局部当量比和喷射空气冷却影响的预热区温度从1300 K增加到1600 K，然后略有下降。升空区温度和流场动力学与热横流中反应射流的升空高度、放热速率和稳定性的变化有关。