Mixing processes between main flow and effusion cooling air are investigated in an effusion cooled, swirl-stabilized pressurized single sector gas turbine combustor using advanced laser diagnostics. Quantitative planar laser-induced fluorescence of the hydroxyl radical (OH-PLIF) and planar laser-induced fluorescence of nitric oxide, seeded to the effusion cooling air, (NO-PLIF) are employed in the primary zone and close to the effusion cooled liner. This data is used to identify mixing events at three stages of premixed combustion, i.e. mixing before reaction, mixing during reaction and mixing after reaction. A parametric study of swirl and cooling air mass flow is conducted to investigate the mutual interaction between flame and cooling air. Within the primary zone, a significant radial asymmetry of OH concentration is observed. This asymmetry is partly explained by the presence of effusion cooling air within the unburned fresh gas, leading to lowered OH concentration within local reaction zones and their post-flame equilibrium concentration. Near the effusion cooled liner, adiabatic mixing after reaction is the dominant process across all investigated operating conditions. Notable mixing before reaction is only observed for the first effusion hole on the center line at low swirl conditions.

使用先进的激光诊断技术，在经渗出冷却，涡流稳定的加压单扇式燃气轮机燃烧室中研究主流和渗出冷却空气之间的混合过程。在主要区域中并靠近喷射冷却衬管，采用了晶种经定量的平面激光诱导的羟基自由基荧光（OH-PLIF）和一氧化氮的平面激光诱导荧光（NO-PLIF），该荧光晶种被注入到排放冷却空气中（NO-PLIF）。 。该数据用于识别预混燃烧三个阶段的混合事件，即反应之前的混合，反应期间的混合以及反应之后的混合反应。进行了旋流和冷却空气质量流量的参数研究，以研究火焰和冷却空气之间的相互作用。在主要区域内，观察到明显的OH浓度径向不对称。这种不对称性的部分原因是未燃烧的新鲜气体中存在喷射冷却空气，从而导致局部反应区内的OH浓度降低，并降低了燃烧后的平衡浓度。在所有冷却液衬里附近，在所有研究的操作条件下，反应后的绝热混合都是主要过程。在低涡旋条件下，仅在中心线上的第一个积液孔中观察到反应之前的明显混合。